RCD unit for 5SL4 — 63 A, 30 mA, type AC
The Siemens SENTRON 5SM2336-0 is a 3-pole residual current device (RCD-unit) designed as a companion for the 5SL4 miniature circuit breaker series. It's rated 63 A at 400 V AC, 50 Hz, with a fixed 30 mA trip threshold and type AC sensitivity — meaning it detects sinusoidal AC fault currents only, not pulsed DC or smooth DC. This is an instantaneous design (no time delay), so it trips as soon as the fault current exceeds 30 mA. That makes it suitable for general-purpose socket-outlet circuits where fast disconnection is required. The 63 A rating covers the full load current of the upstream MCB, so the RCD won't be the bottleneck on a heavily loaded submain.
The unit occupies 3 modular width units (MW) on a standard DIN rail — that's 52.5 mm of rail space. Fastening method is REG (regular snap-on DIN rail), no tools needed. Pollution degree 2 means it's rated for normal indoor environments with only non-conductive contamination.
Thermal derating and service life
At 45 °C it derates to 58.59 A, and at 60 °C to 53.55 A. If your panel runs hot — say a packed enclosure with multiple breakers — check the derating curve: at 70 °C the continuous current drops to 50.4 A. Operating ambient range is -5 °C to 45 °C; storage range is -40 °C to 75 °C.