3PH 225A circuit breaker for P&H 2800

The 79Q639D1 circuit breaker is a 3-phase, 225-ampere electrical protection device designed for use in the auxiliary relay cabinet of P&H mining shovels. It functions by automatically interrupting the flow of current when it detects overloads or short circuits, protecting the electrical infrastructure of the machine. This unit includes a 110-240VAC discharge coil, type SNT211K, which facilitates remote tripping or control signal integration.

This component is compatible with P&H 2800 and 4100XPB shovel models and is specifically designated for installation in the 100A7145F13 auxiliary relay cabinet. The actual manufacturer of this part is Westinghouse Electric Corp., identified by their part number JD3250F-JT250-A2X2-SNT2.

Circuit breakers of this type utilize thermal-magnetic tripping mechanisms to react to both prolonged current overloads and instantaneous short-circuit events. The integrated shunt trip coil allows for controlled disconnection of the circuit from a remote location or through the machine's safety system. These devices are engineered to manage the high-voltage and high-current environments typical of large-scale mining equipment, ensuring that electrical faults are contained before they can cause damage to motors, wiring, or control systems.