The Siemens 5SU1353-0KV25 is a combination residual-current device and miniature circuit breaker (RCBO) in a single 1+N-pole module. It integrates Type AC residual-current protection at 30 mA sensitivity with a B-curve overcurrent trip set at 25 A, all rated for a 4.5 kA short-circuit capacity. The 70 mm depth fits standard Siemens distribution boards and consumer units.
The 30 mA residual sensitivity (IΔn) is the standard threshold for personnel protection against direct contact in TN and TT systems — it clears a ground fault before the let-through energy reaches a dangerous level.
Integration note
The 1+N-pole format occupies a single modular width on a DIN rail, with the neutral switched and protected. The 70 mm depth is consistent with Siemens 5SU1 series RCBOs, so it aligns with standard enclosure gland-plate clearances. Wire termination follows the terminal markings on the housing; no special tooling beyond a standard screwdriver is required.