The Siemens SENTRON 5SV3344-6XX01 is a 4-pole residual current circuit breaker (RCCB) rated for 40 A continuous at 40 °C, with a 30 mA residual trip threshold and Type A sensitivity — meaning it detects sinusoidal AC fault currents plus pulsating DC fault currents, which covers most modern electronic loads like VFDs, switched-mode supplies, and single-phase rectifiers. The instantaneous design (no short-time delay) trips within the standard 300 ms window, making it suitable for direct fault protection in TN and TT systems. The permissible let-through current is 5 200 A, and the I²t withstand is 58 000 A²·s, which gives the upstream MCB or fuse a defined energy window to clear without damaging the RCCB.
Snap-on DIN rail (REG) mounting, any orientation. The depth matches standard 70 mm installation depth for flush-mount distribution boards. Silicon-free construction matters for automotive or coating-sensitive environments where silicone outgassing can cause contact or adhesion failures. Overvoltage category III means it is rated for fixed-installation distribution level, not for downstream socket outlets.