The MGP2503TX is a 3-pole PowerPacT 4 circuit breaker with a MicroLogic 2.2 electronic trip unit rated 250 A at 40 °C. The electronic trip provides LSoI protection: thermal overload (L), short-time short-circuit with fixed delay (So), and instantaneous short-circuit (I). This combination means the breaker discriminates between sustained overloads and hard faults, keeping downstream circuits online during temporary inrush. The utilisation category is A, meaning it is not intended for frequent switching of motor loads — it is a distribution breaker, sized for a 250 A panelboard feed or a 400/630 A panelboard as a main incoming device.
Deployment context
Panel-mounted on a backplate, the breaker accepts horizontal or vertical orientation. The toggle control and local signalling LEDs (green for ready, orange pre-alarm at 90% Ir, red overload at 105% Ir) give the panel builder a visual status without opening the door. Mechanical durability is 20,000 cycles; electrical durability is 20,000 cycles at 440 V at half rated current, halving to 10,000 cycles at full rated current. That is typical for a distribution breaker — not a switching device, but rated for occasional manual isolation.