Siemens 5SY7640-7 SENTRON 5SY7 Miniature Circuit Breaker 3P+N C-curve 40 A 15 kA. Siemens 5SY7640-7 miniature circuit breaker from the SENTRON 5SY7 range. Official Siemens active listing: Miniature circuit breaker 400 V 15kA, 3+N-pole, C, 40A, D=70 mm. Key details: Voltage rating: 400 V, Breaking capacity: 15 kA, Poles: 3P+N, Trip curve: C, Rated current: 40 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.