COMPACT CRICUIT-BREAKER WITH DIN-RAIL MOUNTING AND FRONT CABLE TERMINATION
FIELD OF INVENTION:
[001] The present subject matter described herein, in general, relates to the field of circuit breakers and in particularly relates to compact circuit breaker with din-5 rail mounting provision and front cable termination provision. Further, these provisions give the compact circuit breaker a great mounting flexibility, such that it can be mounted on normal distribution boards, slim distribution boards as well as downstream switch and socket boards.
BACKGROUND AND PRIOR ART: 10
[002] Generally, power distribution board (DB) is the centralized point in modern housing from where supply to all downstream circuits is controlled. As people have become more conscious, they want to economize the space use at their homes and thus compact sized DBs have become the preferred option. The major hindrance to compact size distribution boards is the larger size of prior-art 15 Miniature Circuit Breakers (MCBs). Thus the length and depth of distribution board cannot be reduced beyond a certain limit. This makes them unnecessarily bulky for those applications where user’s electrical safety requirement could have been met from a smaller MCB as well. This also adds on to the cost of complete assembly. 20
[003] Circuit breakers are electrical switches which are designed to protect an electrical circuit of the building from damage caused by over current or overload or short circuit. The basic function of the circuit breaker is to interrupt current flow after protective circuitry detects a fault. In prior art, compact circuit breakers are used in specific downstream circuits, such as for switch-board applications. 25 Generally, the compact circuit breakers have a flat rear housing. They can be mounted on switch and socket boards by using aids, such as mounting brackets. As they do not have recesses for receiving portions of din-rail, so they are not suitable for distribution boards.
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[004] In prior-art of compact circuit breakers, access to terminals for cable wiring was provided on the rear face of circuit breaker. Maintenance is comparatively difficult in such circuit breakers since for repairing, the entire switchboard plate along with circuit-breaker would need to be extracted. For instance, the electrician would need to support the switchboard plate while 5 working on device connections. This is not only time-taking, but also poses a threat of electric shock.
[005] Patent No. 4,900,275 relates to means for mounting a split case circuit breaker to an elongated channel shaped or hat section support rail. A din-rail mounted circuit breaker case has a housing that includes a rear or back side 10 for receiving one flange of the channel shaped rail. A one piece molded plastic latch is provided in a cavity defined by the housing and can be moved from its latched position to an unlatched position by inserting a screwdriver in a slot and bending a stem portion of the latch.
[006] Patent No. 7,488,913 relates to a mountable circuit breaker. The circuit 15 breaker includes a housing having first and second housing members and a latch member. The housing defines a rail receptacle for mounting the circuit breaker on an elongated channel rail. The latch member includes a base portion that includes a movably positionable retainer that moves toward or away from a biased position that is established by a stem portion of the latch member. Movement away from 20 the biased position expands the rail receptacle for mounting the circuit breaker to the rail channel when an external force is applied to a tool receptacle adjacent the junction of the base and stem portions of the latch member. Removing the external force results in the base portion returning to its biased position, securing the circuit breaker to the channel rail. 25
[007] Patent No. 5,318,462 relates to fuse holders and other electronic assemblies that include built-in mechanisms for attaching to rails. The fuse holder includes an insulative housing with integral recesses for receiving portions of a rail and a sliding locking member that slides on the housing between a locked position in which the fuse holder is retained on the rail and a mounting position in 30 which the fuse holder can be mounted on or removed from the rail, the sliding
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locking member being biased toward the locked position via a resilient cantilevered tab of the sliding locking member and maintainable in the mounting position via snap in engagement with a notch on the housing, the sliding locking member having side walls with bent taps which form lips resting on a recessed shelf surface of the housing. 5
[008] Patent No. 7,540,790 relates to a quick-fixing device on electrical installation equipment, in particular, on a power breaker, residual current circuit breaker, or similar, for clipping the same to a standard profile rail in particular a top-hat rail, whereby the electrical installation equipment comprises a recess on the fixing side with a fixed lug arranged on a wall of the recess and a moving lug 10 permanently pressed inwards against a spring force in the direction of a wall, said lug engaging in the assembled state behind the longitudinal edge of the free arm of the top-hat rail. The sprung lug is moulded to a bar, connected in one-piece to the installation equipment by at least one sprung connector web. The webs with the sliders snap over in a definite manner out of the position into the position in 15 which the sliders or the lugs are away from the free longitudinal edges of the top-hat rail.
[009] Patent No. 7,416,421 relates to an enclosure with an integral snap-acting DIN rail mounting feet. The invention includes a component portion and a mounting portion. The mounting portion is integrally formed to the component 20 portion via a flexible hinge. The mounting portion includes a pair of tabs and a pair of mounting feet. Each tab is connected to one of the mounting feet. The mounting feet are adapted to engage the DIN rail. The enclosure can be removed from the DIN rail by lifting up on either one of the tabs. This causes the hinge portion to flex, and the enclosure can be lifted off the DIN rail. 25
[0010] Patent No. 6,444,931 provides a describes a modular circuit breaker housing assembly made of interlocked arrangements of individual housing, and has load and line bus chambers on either side etc. The circuit breaker has alarm contact pins that engage with alarm contact member receptacles of modular assembly. The modular circuit breaker housing assembly makes it possible to 30 consolidate existing PDPs, UFAPs, UFPPs, etc. into a single Integrated Power
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Assembly (IPA) or Integrated Power Distribution Panel (IPDP). Also, the circuit breaker housing assembly provides front access cable connections for better accessibility.
[0011] Patent No. 5,694,288 relates to a circuit breaker of the type including a housing having a front wall, a rear mounting wall, a pair of side walls and a pair 5 of end walls extending between the front and rear walls to define an outer boundary, the housing having a guide means adjacent the rear wall, the rear wall having at least one fastening recess for mounting on a rail, a mounting clip mounted in the guide means, the mounting clip having a rail engaging portion extending into a fastening recess and a release head portion for disengaging the 10 clip from the rail, the mounting clip being movable into and out of the fastening recess from an operating position with the rail engaging portion engaged with the rail to a disengaged position, wherein, in the operating position, the release head portion of the mounting clip is located within the outer boundary defined by the circuit breaker housing. 15
[0012] Indian Publication No. 27/DEL/2000 relates to a circuit-breaker, for mounting on a top-hat rail, comprising a housing, one side of which is configured as a mounting section. A locking bar is provided in the mounting section, said locking bar being fitted on the housing in such a way that it slides and having a projection which extends in the direction of sliding in order to tightly clamp the 20 circuit-breaker on the top-hat rail. A strap-shaped clamp element also provided in the mounting section is fixed on the housing in such a way that when the locking bar moves in to a latching or clamping position, the clamp element is at least partially gripped from underneath and is hereby moved into a position in which it clamps the top-hat rail tight. 25
[0013] Publication No. EP0886353 (A2) relates to a circuit breaker comprising a housing having generally flat parallel side faces provided on an underside thereof with a mounting recess, for mounting on a conventional mounting rail. The circuit breaker for use with the supply assembly comprises an edge face provided with an aperture, which together with a connecting screw provides a conventional means 30 by which the circuit breaker may be secured to a conventional bus-bar.; In
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accordance with this invention the circuit breaker is provided with a contact assembly comprising a generally L-shaped contact member over the majority of the length of which is provided an insulating sheath, leaving a residual uninsulated terminal portion and a contact portion.
[0014] From above prior-arts it can be derived that there is no circuit-breaker 5 which can be mounted on both distribution boards as well as switch-boards. To overcome this gap, and to give flexibility to user, the present subject matter aims to improve the mounting features in compact circuit-breakers. Herein top-hat type din-rail mounting capability is added to such breakers. This way these can be mounted in normal distribution boards, which give the benefits of easy and 10 centralized maintenance. They can also be mounted on compact/slim distribution boards which give the benefit of optimized assembly, size reduction, and cost saving, etc. Moreover, they can also be mounted on switch and socket boards with a more user-friendly din-rail supporting structure. For easy wiring accessibility and safe maintenance, front cable termination is provided in such breakers. 15
OBJECTS OF THE INVENTION:
[0015] The principal objective of the present subject matter is to provide din-rail mounting provision in compact circuit-breaker so that it can be mounted on normal distribution boards or slim distribution boards or in downstream switch and socket outlets. 20
[0016] Another object of the present subject matter is to provide compact circuit-breaker which can be mounted on top-hat type din rail.
[0017] Another object of the present subject matter is to provide the provision of snap-pusher in the compact circuit-breakers for easy maintenance, i.e., mounting and un-mounting of compact circuit-breaker from din-rail. 25
[0018] Still another object of the present invention is to provide front cable termination feature in the compact circuit-breaker for easy and safe wiring accessibility.
SUMMARY OF THE INVENTION:
[0019] In accordance with the said objectives, the present invention provides a 30 compact circuit-breaker with mounting provision on top-hat type din-rail & front
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cable termination. For this, the rear face of thermoplastic housing (both the chassis covers) are provided with integral recess to receive the top and bottom din-rail flange. A snap-pusher can be slidably inserted in the top and bottom chassis for easy mounting and extraction of circuit-breaker from din-rail. Front cable termination feature is provided for easy and safe wiring accessibility. Such 5 compact circuit-breakers give great mounting flexibility to the user whether in distribution board applications or downstream switchboard applications.
[0020] In order to further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative 10 only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally 15 effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods in accordance with 20 embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0022] Fig. 1 illustrates MCB with flat rear housing and rear terminals for cable access as known in the art;
[0023] Fig. 2 illustrates MCB with mounting bracket as known in the art; 25
[0024] Fig. 3 illustrates internal assembly of compact circuit breaker, in accordance with the present subject matter;
[0025] Fig. 4 illustrates structure of hat-type rail or din-rail structure as known in the art;
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[0026] Fig. 5 illustrates rear view of the compact circuit breaker with snap pusher to mount the compact circuit breaker on the din-rail, in accordance with the present subject matter;
[0027] Fig. 6 illustrates back view of snap pusher for the compact circuit breaker, in accordance with the present subject matter; 5
[0028] Fig. 7 illustrates front view of the snap pusher for the compact circuit breaker, in accordance with the present subject matter; and
[0029] Fig. 8 illustrates mounting of the compact circuit breaker on din-rail, in accordance with the present subject matter.
[0030] The figure depicts embodiments of the present subject matter for the 10 purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
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DESCRIPTION OF THE PRFERRED EMBODIMENTS:
[0031] The present subject matter relates to din-rail mounting and front cable termination provision in compact circuit-breakers. This gives a compact circuit breaker with great mounting flexibility, such that it can be installed on normal distribution boards, slim distribution boards as well as switch and socket boards. 20 Front cable termination feature is provided for easy and safe wiring accessibility. The compact circuit-breaker has circuit breaker housing which has a first member housing and second member housing. Further, the circuit breaker housing has a rail receptacle for removably securing the compact circuit breaker to elongated din rail. A pair of retainers is provided on the circuit breaker housing to secure 25 abutment flanges of the din-rail to mount the circuit breaker on the din rail. Further, the pair of retainers has a fixed retainer and a movably positioned retainer. The movably positioned retainer is to receive the bottom abutment flange of the din rail in the rail receptacle upon application of an external force on the circuit breaker. 30
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[0032] Further the movably positioned retainer comprises a snap pusher for linear movement. The snap pusher has an upper tapered portion to receive the bottom abutment flange of the din rail and a U shaped structure which is closed with the upper tapered portion at top. Further a spring structure is provided in between the U shaped structure which is elongated from middle of the upper tapered portion 5 The snap pusher has a tool receptacle at the end of the U shaped structure to receive a flat head screw driver to pull the snap pusher in downward direction to un-mount the compact circuit breaker from the din rail.
[0033] The invention is described below by referring to MCB, but it is equally valid for other type of circuit breakers as well such as Isolator, RCBO etc. Also, 10 dimensions in below figures are for illustrative purposes and may have some reasonable tolerances.
[0034] Fig. 1 and 2 show typical prior art compact MCB. The prior art mini MCB 1 has a compact size (reduced length ‘2’ and height ‘3’). It mostly comes in the dimension of regular switch/sockets. It has rear terminals 4 for access to cable 15 wiring. The mini MCB 1 has a flat rear design 5 and has no provision for mounting on its housing. As shown in the fig. 2, the mini MCB 1 is used along with mounting brackets 6 which enable it to be flush-mounted to the switchboard box. This way it can be used for selective downstream applications. But this restricts its use for mains distribution board. Moreover when the electrician has to 20 replace any device on switchboard, the electrician has to remove entire switchboard mounting plate and carry out maintenance work. Since MCB wiring is done from the rear side, the MCB would also need to be extracted. In such a situation, contact with any loose live wires could lead to fatal accidents.
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[0035] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those 30 skilled in the art that by devising various arrangements that, although not
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explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be 5 construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying 10 figures.
[0036] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise 15 various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0037] Fig. 3 illustrates internal assembly of compact circuit breaker, in accordance with the present subject matter. Referring to the fig. 3 and 4, the inventive compact circuit-breaker 7 is illustrated. The compact circuit breaker 7 20 has precisely formed moulded thermoplastic chassis covers or housings. The compact circuit breaker housing has two parts, i.e., first housing member 8 and the second housing member. The first housing member 8 is illustrated in the figure 3, on which components of the circuit breaker 7 are assembled, while the other housing (which is not shown): has its complementary design. It can be said that 25 first and second member of the circuit breaker housing are mirror image of each other. But the first housing member 8 is different in width to accommodate different type of components of the circuit breaker 7. Whereas the second member housing is just a cover on the first member housing.
[0038] Further, compact size of circuit-breaker 7 is achieved by means of 30 compact design and assembly of its components. The circuit-breaker 7 consists of
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several sub-assemblies. The operating mechanism sub-assembly 15 is used to trip the circuit-breaker 7. During short-circuit faults, the short-circuit current actuates a solenoid 16 causing a plunger 17 to strike the latching mechanism 18, thus rapidly opening the main contacts 25 and 26. The arc under the influence of the magnetic field and arc runners 19 is guided towards the arc chute 20 where it is 5 rapidly split and quenched. During overload conditions, the bimetallic strip 21 heats up and deflects the latch mechanism 18, thereby opening the contacts 25 and 26. The outgoing and incoming terminal sub-assemblies 22, 23 hold cable connections. The grub-screw sub-assembly 24 is used for circuit-breaker calibration. During normal running condition, the current flows in MCB from the 10 incoming terminals, to the fixed contact 25, then moving contact 26, followed by coil, then the bimetal, and then the outgoing terminal. All parts are arranged in series. During overload, short-circuit or during manual turn on/off of the MCB, the latch point is displaced. As a consequence, the moving contact 26 separates from fixed contact 25 and the circuit breaks. 15
[0039] Figure 4 illustrates structure of din-rail or hat-type rail which is used in the present subject matter to mount the compact size circuit breaker in the distribution boards. The din-rail 400 has two abutment flanges top flange 402 and bottom flange 404 to support mounting of the circuit breaker. Further, the both the abutment flanges are laterally spaced opposite to each other. Further, structure of 20 the din-rail is well known to the person skilled in the art. Therefore, further explanation of the din-rail is not provided to make the present subject matter concise and related to inventive feature, i.e., mounting structure.
[0040] Fig. 5 illustrates rear view of the compact circuit breaker housing with snap pusher to mount the compact circuit breaker on the din-rail, in accordance 25 with the present subject matter. The circuit breaker housing 500 is made of thermoplastic material. The circuit breaker housing 500 has first housing member 500a and second housing members 500b. On the first housing member 500a components of the circuit breaker 7 are assembled, while the other member housing 500b has its complementary design. It can be said that first and second 30 member housing (500a, 500b) of the circuit breaker are mirror image of each
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other. But the first housing member 500a is different in width from the second member housing 500b to accommodate different type of components of the circuit breaker. Whereas the second member housing 500b is just a cover on the first member housing 500a. The circuit breaker housing 500 has din-rail receptacle 504 to removably receive the din-rail 400 from its abutment flanges 402, 404. Both 5 the housings of the circuit breaker housing 500 has two steps or a pair of retainers 502 and 506 which are disposed on the opposite sides of the rail receptacle 504 and extend inwardly toward the rail receptacle 504. The top step or retainer 502 has an integral recess portion to engage with top flange 402 of din-rail 400. Whereas the bottom step or retainer 506 has snap pusher 508 to hold the circuit 10 breaker 7 on the bottom flange 404 of the din rail 400.
[0041] The combination of the first and the second housing member 500a, 500b creates a vertical cavity or gap to receive the snap pusher 508. The bottom retainer 506 is movably position able which allows distance between the retainers of the rail receptable to temporarily expand so that the circuit breaker 7 can be mounted 15 on the din rail 400 without needing to be slid from one end to other end of the din-rail 400. The snap pusher 508 act as a movable retainer while applying force on the circuit breaker 7.
[0042] During installation of the circuit breaker 7 on the din rail 400, the circuit breaker housing 500 can be placed on the top abutment flange 402 at the top 20 retainer 502 as first step. In the second step, an external force is applied on the circuit breaker housing 500 to push the bottom retainer 506 on the bottom abutment flange of the din rail 400. When the bottom retainer 506 forced towards the bottom abutment flange 404, the bottom retainer 506 moves down due to external force to receive the bottom abutment flange 404 and locked the circuit 25 breaker 7 on the din rail 400. The bottom retainer 506 is movable due to snap pusher.
[0043] Fig. 6 & 7 illustrates the structure of snap pusher for the compact circuit breaker, in accordance with the present subject matter. The snap pusher 600 is a U shape structure. The U shaped snap pusher 600 is closed at top with an upper 30 tapered portion 602. Further, the snap pusher 600 has a spring structure 604 at the
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center which is extending away from the tapered portion 602. The spring structure 604 is enclosed in the U shaped structure. The snap pusher 600 has a tool receptacle 606 to receive a tool for the application of an external force during un-mounting of the circuit breaker from the din rail. During mounting of the circuit breaker on the din rail an external force is applied on the circuit breaker towards 5 the din-rail to mount the circuit breaker on the din rail. Due to applied external force on the din-rail from the circuit breaker 7, the tapered portion 602 of the snap pusher 600 is pushed downward to receive the bottom abutment flange 404 of the din rail. The snap pusher 600 can move downward and upward direction due to the spring structure 604 in the snap pusher. During un-mounting of the circuit 10 breaker 7 from the din-rail 400, a tool, such as screw driver with flat head is inserted in the tool receptacle 606 and the snap pusher 600 is pushed in downward direction to dis-ambled the circuit breaker 7 from the din rail 400. When the external force from the screw driver is removed, the snap pusher 600 regains its original position due to the spring structure 604 of the snap pusher 600. 15
[0044] Further, the snap pusher 600 has a step 608 at middle of the position of the U shaped structure to restrict the movement of snap pusher 600 beyond it. The snap pusher 600 has a flat portion 702 (fig. 7) which allow linear movement of the snap pusher 600 in the cavity created between the circuit breaker housing. The snap pusher 600 allowed to linearly move in the cavity upto a certain limit which 20 allow assembly and dis-assembly of the circuit breaker 7 on the din rail 400.
[0045] Fig. 8 illustrates cross section view of the mounted compact circuit breaker on din-rail, in accordance with the present subject matter. The present circuit breaker has terminal screws for cable connection 9 from the front. Therefore, wiring connections can be done after installation of the circuit breaker on the din 25 rail from the front side. As explained in the figure 5, the housing of the circuit breaker 7 has a rail receptacle and two steps or a pair of retainers 10 and 11 which are disposed on the opposite sides of the rail receptacle 30 and extend inwardly toward the rail receptacle 30. The rail receptacle 30 receives din-rail or hat type. The top step or retainer 10 has an integral recess portion to engage with top 30 abutment flange 12 of din-rail 32. Whereas the bottom step or retainer 11 along
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with snap pusher 14 holds the circuit breaker 7 on the bottom flange 13 of the din rail 32. The snap-pusher 14 can be linearly slided over the gap in bottom step 11 of housing when pushed. Further, the snap pusher 14 gets locked with the bottom step 11 in circuit breaker housing 7 by snap-fit mechanism. In the mounted position, the snap-pusher when seen from front, has a U-shaped design to insert 5 the screw-driver & lift the circuit breaker from the din-rail. This facilitates easy mounting and un-mounting of the circuit-breaker from the din-rail. Hence maintenance becomes easy and fast. Further, while carrying out any maintenance activity, circuit breaker would not need to be extracted out. Hence its wiring need not be disturbed. The present circuit breaker is also better from safety point of 10 view.
[0046] In the present invention, it is now also possible to mount the compact circuit-breaker on normal distribution boards or slim distribution boards as it can be installed on din-rail. This gives great flexibility to user in terms of location of mounting in the premises. 15
[0047] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component 20 of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

We claim:
1. A compact circuit-breaker (7) for mounting on distribution boards as well as downstream switch and socket boards with help of din rail (400), the compact circuit breaker (7) comprising:
a circuit breaker housing (500) having a first member housing 5 (500a) and second member housing (500b);
a rail receptacle (504) provided for removably securing the compact circuit breaker (7) to elongated the din rail (400);
a pair of retainers (502, 506) provided on the circuit breaker housing (500) to secure abutment flanges (402, 404) of the din-rail 10 (400);
a bottom retainer (506) from the pair of retainers (502, 506) is movably positioned to receive the bottom abutment flange (404) of the din rail (400) in the rail receptacle (504) upon application of an external force on the circuit breaker (7). 15
2. The compact circuit-breaker (7) as claimed in claim 1, wherein the moving bottom retainer (506) comprises a snap pusher (508, 600) to form movable retainer, wherein the snap pusher (508, 600) comprises:
an upper tapered portion (602) to receive the bottom abutment 20 flange of the din rail (400);
a U shaped structure which is closed with the upper tapered portion (602) at top; and
a spring structure (604) provided in between the U shaped structure, wherein the spring structure (604) is elongated from 25 middle of the upper tapered portion (602).
3. The compact circuit-breaker (7) as claimed in claim 1, wherein upper retainer (502) from the pair of retainers is integrated with the circuit breaker housing (500) to receive the top abutment flange of the din rail 30 (400).
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4. The compact circuit-breaker (7) as claimed in claim 2, wherein the snap pusher (600) has a tool receptacle (606) to receive a flat head screw driver to pull the snap pusher in downward direction to un-mount the compact circuit breaker (7) from the din rail (400).
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5. The compact circuit-breaker (7) as claimed in claim 1, wherein a snap-pusher (600) is slidably inserted in the circuit breaker housing (500) for easy mounting and un-mounting of the circuit-breaker (7) from the din-rail (400).
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6. The compact circuit-breaker (7) as claimed in claim 2, wherein the snap pusher (600) has a step to restrict linear movement of the snap pusher (600) along cavity in the circuit breaker housing (500) to a limit from where the compact circuit breaker (7) can be mounted and un-mounted.
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7. The compact circuit-breaker (7) as claimed in claim 1, wherein the circuit breaker housing (500) has a cavity/gap at bottom side to receive snap pusher (600) for mounting and un-mounting of the compact circuit breaker (7) from the din rail (400).
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8. The compact circuit-breaker (7) as claimed in claim 2, wherein the spring structure (604) of the snap pusher (600) allows the bottom retainer (506) to move in downward direction upon applying external force on the circuit breaker (7) towards the din rail (400).
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9. The compact circuit-breaker (7) as claimed in claim 2, wherein the spring structure (604) of the snap pusher (600) allows the linear up and down movement of the bottom retainer (506) during mounting and un-mounting of the compact circuit breaker (7) on the din rail (400).
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10. The compact circuit-breaker (7) as claimed in claim 2, wherein the upper tapered portion (602) helps to hold the circuit breaker (7) onto the bottom abutment flange of the din rail (400) during application of external force.
11. The compact circuit-breaker (7) as claimed in claim 1, wherein the 5 compact circuit breaker (7) has front cable termination feature.