The instantaneous design (no time delay) trips within 40 ms at rated residual current, so it is the right choice for final circuits where selectivity upstream is handled by a delayed S-type RCCB. The 4-pole (3P+N) form factor takes four width units on a DIN rail (72 mm wide), so it fits standard distribution boards with 18 mm per pole.
Deployment context
Snap onto a DIN rail (REG) inside a panel or distribution board.
