Siemens 5SY4406-8 Miniature Circuit Breaker 5SY4 4-pole 6A D. Miniature circuit breaker 400 V 10kA, 4-pole, D, 6 A, D=70 mm. It belongs to Basic Devices. Recorded manufacturer technical characteristics include Poles: 4; Rated current: 6 A; Tripping curve: D.