1. Coil Terminal Connection Method: This is the sole core difference between the two models. AEVT1000-BU (BUSBAR): The coil power input is designed for a bolted terminal connection. It is specifically intended for direct connection to a pre-fabricated copper busbar or heavy-gauge wire fitted with a lug. This method offers superior mechanical strength and current-carrying reliability. It is suitable for applications with significant vibration, requirements for extremely low connection impedance, and where installation space permits a rigid connection. AEVT1000-BL (WIRE LEADS): The coil power input consists of pre-attached wire leads. This simplifies installation (no need to prepare separate termination hardware) and provides greater wiring flexibility. It is particularly advantageous in space-constrained environments or where cable routing requires bends to fit the layout. Its electrical performance is equivalent to the BU version; however, the ultimate mechanical reliability of the connection depends on the field crimping and strain relief practices applied to the leads. Selecting the BU version typically indicates a highly integrated, high-reliability rigid power distribution system (e.g., connection to a fixed DC busbar within a cabinet). Opting for the BL version offers greater installation flexibility and simplicity, which may be preferable for subsystems or applications with specific routing requirements. The BL version is also significantly lower in cost, offering savings in both component price and installation labor, provided its connection reliability meets the application's demands.