Siemens 5SY4440-7 SENTRON 5SY4 Miniature Circuit Breaker 4P C-curve 40 A 10 kA. Siemens 5SY4440-7 miniature circuit breaker from the SENTRON 5SY4 range. Official Siemens active listing: Miniature circuit breaker 400 V 10kA, 4-pole, C, 40A, D=70 mm. Key details: Voltage rating: 400 V, Breaking capacity: 10 kA, Poles: 4P, Trip curve: C, Rated current: 40 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.