40 A, 4-pole RCCB — what the ratings mean for fit
The ABB 2CSF204401R1400 is a 4-pole residual current circuit breaker (RCCB/RCBO) rated at 40 A continuous current, with a 500 V insulation voltage at 50 Hz — this covers the standard 230/400 V three-phase distribution panel where the breaker sits on the outgoing side of the main switch, protecting a branch circuit against earth leakage. The 4-pole configuration (3 phases + neutral) means it fits three-phase four-wire systems; the neutral pole opens with the phases, so the circuit is fully isolated when the breaker trips — required for TT or TN-S earthing systems where the neutral is not bonded to the protective earth downstream.
DIN rail mount, IP2X — panel integration
Snaps onto a standard 35 mm DIN rail (EN 60715) inside the distribution board or sub-panel — the 70 mm width occupies 4 modular units (4 x 17.5 mm), so it replaces a standard 4-pole MCB footprint without re-drilling the mounting plate. IP2X means the housing is finger-safe — no live parts are accessible through the front vents — but it is not sealed against moisture; install inside a cabinet rated for the environment, not outdoors or in washdown areas.