Siemens 5SY4550-7 SENTRON 5SY4 Miniature Circuit Breaker 1P+N C-curve 50 A 10 kA. Siemens 5SY4550-7 miniature circuit breaker from the SENTRON 5SY4 range. Official Siemens active listing: Miniature circuit breaker 230 V 10kA, 1+N-pole, C, 50 A, D=70 mm. Key details: Voltage rating: 230 V, Breaking capacity: 10 kA, Poles: 1P+N, Trip curve: C, Rated current: 50 A, Installation depth: 70 mm. Selected for common Egypt and Gulf low-voltage panel demand, including distribution boards, industrial control panels, maintenance replacement, and OEM panel-building projects.