Embodiments of the invention in general relates to the field of miniature circuit breaker, and more particularly to a magnetic fault indication mechanism which indicates Low level Short-circuit fault tripping of a miniature circuit breaker (MCB).
BACKGROUND OF THE INVENTION
A Miniature Circuit Breaker, MCB, is used as Overload and Short-Circuit protection device. Every time the fault occurs, MCB trips and supply cuts off.
If MCB is tripped, it is very difficult to find out, whether MCB is tripped because of Overload current or Short-Circuit Current as there will not be any differentiation or indication. To resolve this, short-circuit indication mechanism, which is inbuilt part of MCB, is used.
Reference is drawn to WO2013114395A2, disclosing a short-circuit fault indicator mechanism adapted for indicating a normal operating condition, a short-circuit condition and an OFF condition of a circuit breaker is disclosed. The short-circuit indicator mechanism comprises a slider, a solenoid, and a rotating arm. The slider is having a first end connecting to a first hook. The slider is having a second end connecting to a solenoid. The slider is slidably movable between a first position and a second position responsive to a plurality of operating conditions of the circuit breaker. The rotating arm is having a second hook that engages and/or disengages with the first hook in the first and second position of the slider respectively. The rotating arm is having an indication flag that indicates the plurality of operating conditions of the circuit breaker.
Prior art describes the operation of Short-Circuit Fault Indicator in Miniature Circuit Breaker (MCB), which will actuate at specific current (Termed as Short-Circuit Current), which might be higher than Fault current as per short-circuit

release setting. In addition, the travel loss between Hammer and Fault Indicator Lever increases the threshold limit that actuates the Indication Mechanism.
WO2013114395A2 uses four components in Actuation Mechanism. These limitations may not indicate the Low level Short-circuit Fault tripping in MCBs, as lesser current may not generate sufficient travel in Hammer or Loss of travel between Hammer and Fault Indicator Lever.
The present invention offers immediate actuation of Magnetic Fault Indication Mechanism, even in case of low level short-circuit Current causing MCB to trip and avoiding travel loss between various components as the number of components used in this invention reduced to two components.
Additionally, in prior art invention, the assembly of Fault Indicator lever (30), Fault Indicator (50) and Fault Indicator Spring (30) requires skilful operation which results in higher assembly time. As the Miniature Circuit Breaker (MCB) (100) are manufactured in millions of numbers and should need less assembly time for higher productivity.
Because of above reason, there is a possibility that the Short-Circuit fault indicator mechanism may not actuate low lever short-circuit fault current and a skilful assembly operation increases overall assembly time.
Reference is drawn to CN104252998A, describing the operation of tripping indicating device in Miniature Circuit Breaker (MCB) which will actuate when there is overload or Short Circuit. The same mechanism gives indication in both cases (Thermal as well as short circuit fault). This mechanism does not differentiate between Overload and Short-Circuit fault as it gives same indication in both fault cases.
In view of the prior art, there is a dire need of a mechanism to give indication visually or by triggering an alarm. Also, this mechanism will not actuate in case of

Overload tripping of MCB. This will differentiate the tripping of MCB, through indication, whether it is tripped due to Overload current or Short-Circuit Current.
SUMMARY OF THE INVENTION
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.
An object of the present invention is to provide Short-circuit Fault Indication for fault current higher than Short-circuit release setting.
An object of the present invention is to provide an improvement in existing mechanism, which improves actuation of mechanism at fault current higher than Short-circuit release setting and reduces number of components and assembly time.
According to one aspect of the present invention, a Miniature Circuit Breaker, MCB, having a short-circuit release and thermal release for protection against short-circuit fault and overload fault, the MCB comprising: a Short-circuit release adapted to generate magnetomotive force in case of a short-circuit fault, to enable a hammer mechanically connected to an actuator of Short-circuit release and a fault indicator lever, wherein said hammer is adapted to transfer the force and linear travel from short-circuit release to tripping latch of main mechanism in order to trip the MCB, wherein said fault indicator lever is adapted to travel along with the hammer in the event of short-circuit fault and the fault indicator lever is adapted to always remain in latched condition with a fault indicator during normal ON-OFF operation of the MCB, and the fault indicator is adapted to rotate to show a marked or a coloured face of the fault indicator through an indicator slider

According to another aspect of the present invention, a method for protection against short-circuit fault and overload fault by a Miniature Circuit Breaker, MCB, having a short-circuit release and thermal release, the method comprising the steps of: generating, by Short-circuit release, a magnetomotive force in case of a short-circuit fault, transferring the force and linear travel from short-circuit release to tripping latch of main mechanism in order to trip the MCB, by a hammer mechanically connected to the actuator of Short-circuit release and a fault indicator lever; moving, by said fault indicator lever travels along with the hammer in the event of short-circuit fault; always remaining in latched condition, by the fault indicator lever with a fault indicator during normal ON-OFF operation of the MCB; and indicating, by the fault indicator by showing a marked or a coloured face of the fault indicator through an indicator slider window to give an indication that MCB has tripped on short-circuit fault.
Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
The above and other aspects, features and advantages of the embodiments of the present disclosure will be more apparent in the following description taken in conjunction with the accompanying drawings, in which:
Fig. 1 illustrates an existing Short-Circuit Indication mechanism, according to prior art.
Fig. 2 illustrates Magnetic Fault Indication Mechanism (Latched), according to an embodiment of the present invention.
Fig. 3 illustrates Magnetic Fault Indication Mechanism (De-latched), according to

Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
DETAILED DESCRIPTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
The present disclosure will now be described more fully with reference to the accompanying drawings, in which various embodiments of the present disclosure are shown. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to the various embodiments set forth herein, rather, these various embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the present disclosure. Furthermore, a detailed description of other parts will not be provided not to make the present disclosure unclear. Like reference numerals in the drawings refer to like elements throughout.
The subject invention lies in providing a Miniature Circuit Breaker, MCB, having
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