Siemens 5SY7450-6 5SY MCB 4-pole 50 A B-curve 15 kA. Miniature circuit breaker 400 V 15kA, 4-pole, B, 50 A, D=70 mm. It belongs to Basic Devices. Recorded manufacturer technical characteristics include Poles: 4; Rated current: 50 A; Rated voltage: 400 V; Tripping curve: B; Breaking capacity: 15 kA.