The Siemens SENTRON 5SM3614-0KL is a 2-pole residual current operated circuit breaker (RCCB), Type AC, rated 40 A at 230 V AC with a 300 mA residual trip threshold and a 10 kA short-circuit current rating. It mounts on a DIN rail and occupies 2 modular width units, making it a direct fit for standard distribution boards.
Ratings and what they mean for fit
The 300 mA residual trip (Type AC) is sized for sinusoidal AC fault currents only — suitable for general-purpose circuits where no pulsed DC or frequency-converter leakage is present. The 40 A rated current and 10 kA SCCR cover most residential and light commercial sub-distribution boards. Conductor cross-section of 1 to 16 mm² solid or stranded accepts standard building wire; the screw terminals need 2.5 to 3 N·m tightening torque.
Lifecycle and sourcing
This RCCB is in its current lifecycle stage — still an active catalog number in the SENTRON 5SM3 family. Sourced and quoted to order against an RFQ through independent distribution; current pricing and availability confirmed at quote time.
Integration notes
Mounts on DIN rail in any position; supply can enter from top or bottom. The N-left variant (product variations field) means the neutral terminal is on the left side — verify orientation against your panel layout before snapping it in. Ambient operating range is -5 to +45 °C; storage from -40 to +75 °C. IP20 protection with connected conductors in an installed distribution board.
Compliance and approvals
Overvoltage category III, finger- and back-of-hand safe touch protection. Silicon-free construction. The 5SM3 design is a standard residual current circuit-breaker for IEC markets; compliance documentation (RoHS, REACH, relevant IEC standards) is available from the manufacturer.