Siemens 5SY7663-8 5SY MCB 3+N-pole 63 A D-curve 15 kA. Miniature circuit breaker 400 V 15kA, 3+N-pole, D, 63 A, D=70 mm. It belongs to Basic Devices. Recorded manufacturer technical characteristics include Poles: 3+N; Rated current: 63 A; Rated voltage: 400 V; Tripping curve: D; Breaking capacity: 15 kA.