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. The 30 mA trip is the standard for personnel protection in residential and light commercial panels. 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.
Panel fit and mounting
The unit occupies 3 modular width units (MW) on a standard DIN rail — that's 52.5 mm of rail space. Depth is 70 mm, which is typical for this class of RCD and leaves clearance for wiring in a standard 100 mm deep enclosure. Mounting position is any, so it can go sideways or upside-down in a tight gland plate layout without derating. Fastening method is REG (regular snap-on DIN rail), no tools needed. The housing is not sealable, so it's for indoor panel use only — no washdown or outdoor exposure without an additional enclosure. Pollution degree 2 means it's rated for normal indoor environments with only non-conductive contamination.
Thermal derating and service life
The 63 A rating holds at 40 °C ambient. 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. The mechanical service life is 10,000 switching cycles typical, which is adequate for a distribution RCD that sees infrequent manual testing and rare fault trips. Operating ambient range is -5 °C to 45 °C; storage range is -40 °C to 75 °C. Overvoltage category III means it's suitable for fixed installation downstream of the main distribution board.