The 2DU50M from Altech is thermal magnetic circuit breaker with 2 pole, lever actuator and positive trip indicator (green - off/tripped, red - on). This DIN rail mount circuit breaker has D-trip curve, 50A current rating, 277VAC voltage rating and 10kA short circuit withstand capacity. Ambient temperature range is from -25°C to 60°C (-13°F to 140°F).