Siemens 5SY4125-6 SENTRON 5SY4 Miniature Circuit Breaker 1P B-curve 25 A 10 kA. Siemens 5SY4125-6 miniature circuit breaker from the SENTRON 5SY4 range. Official Siemens active listing: Miniature circuit breaker 230/400 V 10kA, 1-pole, B, 25A, D=70 mm. Key details: Voltage rating: 230/400 V, Breaking capacity: 10 kA, Poles: 1P, Trip curve: B, Rated current: 25 A, Installation depth: 70 mm. Selected for Egypt and Gulf MCB demand, including distribution boards, light-commercial panels, industrial control panels, maintenance replacement, and OEM panel-building projects.