The Siemens 5SL4213-7RC is a SENTRON miniature circuit breaker (MCB) — a 2-pole unit rated 13 A with a C tripping characteristic, breaking 10 kA at 415 V AC per EN 60898. Occupies a single modular width (18 mm) on the DIN rail, so it snaps into one slot in a standard SENTRON distribution board. Depth of 76 mm means it clears the gland plate on most domestic enclosures without a spacer. Mounting position is unrestricted — vertical, horizontal, or upside-down on the rail; the arc chamber vents work the same way. Not for motor starts (that is a D-curve job) and not for sensitive electronics (that is a B-curve). At 13 A it feeds a 3 kW resistive load on a 230 V leg or about 9 kVA on a 400 V three-phase split.
Form factor and panel fit
Width is 18 mm — one modular unit, so it lines up with other SENTRON breakers and accessories on the same DIN rail without gaps. The 76 mm depth is the key number for enclosure selection: if your box has a 60 mm gland plate clearance, this breaker will not sit flush without a spacer or a deeper lid. IP20 with connected conductors — finger-safe from the front once wired, but not protected against dripping water. Fine inside a closed distribution board; not for outdoor or washdown zones without an outer enclosure. Degree of pollution 2 (normal, non-conductive dust) and overvoltage category III (distribution level) confirm it belongs in the sub-distribution board, not at the service entrance.