The Siemens SENTRON 5SV4344-0KL is a 4-pole residual current circuit breaker (RCCB), Type AC, rated 40 A with 30 mA sensitivity at 400 V AC, 50 Hz. The N pole is on the left side of the unit. This is an instantaneous-trip device (no intentional short-time delay), designed to disconnect the circuit when leakage current exceeds 30 mA — the threshold for supplementary protection against direct contact in standard residential and commercial installations. The 30 mA sensitivity is the standard for personal protection against electric shock; the 40 A rated current suits it for main or sub-main protection in distribution boards feeding multiple downstream circuits.
Mounting position is unrestricted; depth is 70 mm, matching the standard installation depth for SENTRON modular devices. The silicon-free construction is relevant for applications where silicone outgassing could contaminate contacts or optical surfaces.
Electrical ratings and fault withstand
Rated short-circuit current is 10 kA, and the conditional short-circuit current per IEC 61008-1 is 0.8 kA. The maximum permissible series fuse short-circuit current is 80 A — this sets the upstream fuse or MCB rating needed to protect the RCCB under fault conditions.