TERMINAL BLOCK FOR A PROTECTIVE RELAY Field of the Invention The present invention relates to protective relays for providing protective control to electncd distribution systems. More paricularly, the present invention relates :o lerminal connections which connect the rolay circuitry to the electrical distribution systera. Background of the Invention Protective relays for electrical distribution : ystems provide numerous functions relating to protective control, including ever-current and under-voltage protection, and ars essential elements of any electr.cal distribution system. Protective relays include internal processing circuitry which monitors the portion of the electrical distribution system with which it is associated (e.g., a feeder line) and provide protection and control functions as necessary. Conventional protective relays include digital circuitry in which logic functions determine the operation of the relay, such that the relay wil. operate to provide protective control under certain specified, potentially hazardous conditions. Protective relays must be operativeiy connected to the electrical distribution systeri to be monitored. Such connecu'ons between the internal circuitry of the protective relay and the electrical distribution system are conventionally established by terminal blocs. The terminal blocks, when ths protective relay is associated with a current transformer, enable the relay to short-circuit the terminals of the transformer. Conventional terminal blocks provide staggered connection terminals to improve user accessibility. However, due to the number of possible connection schemes between a protective relay and an electrical distribution system, staggered terminals may not provide adequate user acccssitility. Further, :he connection terminals of conventional terminal blocks, evf n if staggered, are typically fixed in configuratior.,- Ti.-rmir.a! blocks providing flexible mourning arrangements would be desirable, though conventional terminal blocks do not adequately provide such a capability. Further, many terminal blocks do not allow shorting capabilities to be configurable for multiple positions and in any location in the block. Summary of the Invention The present invention overcomes the aboue-noied deficiencies, and achieves other advantages, by providing for a protective relay terminal block configurable in a plurality of tiers, each tier being a different length, such that the relay connections associated with each tier are a different distance irom the protective relay to improve accessibility. An exemplary terminal block according to the present invention includes a plurality of sep;irabie, modular tiers. Each tier has a first end provided with terminal connections for electrical connection to an electrical distribution system. A second end, opposite the first end, is provided with a set of contacts for electrical connection to signal terminals of a module in a protective ready. Each tier has a different length between the first and second ends. Each tier can be provided with at least one dovetailed alignment element which allows the their to be slidably engaged with a dovetailed alignment element of an adjacent tier to engage adjacent tiers. According to another aspect of the preser.t invention, an exemplary protective relay includes relay processing circuitry for performing protection and control functions in an electrical distribution system, and at least one terminal block. Each terminal block has a plurality of separable tiers. Each tier has a first end provided with terminal .connections for electrical connection to the electrical distribution system, and a second end opposite the first end i ? provided with a set of contacts for electrical connection to the relay processing circuitry. Each of the plurality of tiers has a different length between the first and second ends. According to cither aspect of the present invention, an exemplary terminal block can optionally include shorting fingers electrically connected to each contact, each shorting linger configured so as to contact shorting finger associated with an adjacent contact when there is no module connected to the terminal, block. Each terminal connection can be implemented by a screw which attaches a contact to the terminal block at the first end of its associated tier. lEach contact preferably extends beyond ''he second end of its associated tier by a substantially uniform length. A terminal clock according to the present invention advantageously provides enhanced user accessibility as at least one result of tie variable number of modular tiers. Further, the lerminal block can be mountable :.n multiple orientations (e.g., left or right}, and can be configured, using appropriate snorting fingers, to provide shortinc; between any two adjacent terminal connections. Brief Description of the Accompanying Drawings The present invention can be understood more clearly upon reading the following Detailed Description of Preferred Embodiments in conjunction with the accompanying drawings, in which like reference intlicia designate like elements, and in which: FIG. 1 is a view of a relay connection interface showing the terminal connections for connecting the relay to an electrical distribution system; FIG. 2 is a profile view of a terminal block according to an embodiment of the present invention; FIGs. 3A-C are a top, side, and front view, respectively, of a contact suitable for use in the tenr.inal block of FIG. 2; FIGs. 4A-3 are side and front views, respectively, of a shorting finger suitable for use in the terminal block of FIG. 2; and FIGs. 5A-C are top, front, and cross-sectior al side views of a tier element suitable for use in the terminal block of FIG. 2. Detailed Description of PreferredJErnbodi meats FIG. 1 shows a relay connection interface 12 including terminal blocks 14 provided with terminal connections 16 for connect ;ng the relay to an electrical distribution system (not shown). The interface 12 would typically be provided on a surface of a relay housing. As shown in FIG. 1, ar.d as will be shown in more detail later, the terminal blocks 14 can have three tiers, or levels 14a-c, each tier being provided with terminal connections. Each tier has a different length, such that each row of terminal connections is located a differen: distance from the surface of the relay housing. By providing terminal connections at varying distances from the surface of the relay housing, the present invention increases user accessibility to the terminal connections. Further, as shown in FIG. 1, terminal blocks according to the C3 present invention can be mounted facing in multiple directions (e.g., either left or righ;). This aspect of the terminal block accordhg to the present invention provides additional moaning flexibility over conventional terminal blocks. FIG. 2 is a cross-sectional profile view of an exemplary terminal block according to th; present invention. The terminal block 14 in this example is comprised of three modular, separable tiers 14a, 14b, and 14c. It will be appreciated that, due to the modularity of the tiers, the number of tiers is easily varied. The construction of the tiers, and their assembly into the terminal block of FIG. 2, will be described in more detail below. Each tier includes a molded plastic portion 18, a contact 20, and a terminal connection screw 22. The terminal connection screw 22 screws into a mounting hole as shown in FIG. 2 and is mechanically and electrically in contact with the contact 20 at a first end. According to one exemplary embodiment, the terminal connection screw 22 provides a terminal connection capable of acc