The Siemens SENTRON 5SY3004-7WM is a 1P+N miniature circuit breaker rated 4 A at 230 V AC with a C tripping characteristic and a 4.5 kA breaking capacity per EN 60898.
At 4 A, this breaker protects a circuit drawing up to 920 VA at 230 V. EN 60898 is the standard for household and similar installations, so this breaker is certified for use in consumer units and distribution boards meeting that standard. The 1P+N pole configuration switches both the phase and the neutral, but only the phase has overcurrent protection — the neutral pole is a switched neutral only. This is common in single-phase final circuits where local regulations require simultaneous disconnection of both conductors. The 1 MW width (18 mm) means it occupies one modular space on a DIN rail, leaving adjacent slots for other breakers or accessories.
DIN-rail integration and panel fit
The 18 mm width (1 MW) and 90 mm height are the standard SENTRON compact footprint. Mounting position is unrestricted — vertical, horizontal, or inverted — which simplifies layout in crowded enclosures. Terminal torque range is 17.7 to 22.1 lbf·in (2.0 to 2.5 N·m). Touch protection is integral on the line-side terminals.