The Siemens 5SU1336-7FP25 is a SENTRON-branded residual current circuit breaker with overcurrent protection (RCBO), combining a 3-pole miniature circuit breaker and an earth leakage module in a single 3-module-width unit. It is designed for 50 Hz networks only, with a C-curve trip characteristic rated 25 A at 30 °C, derated to 21 A at 70 °C. Breaking capacity is 6 kA per both EN 60898 and IEC 60947-2, sufficient for most commercial and light industrial sub-distribution boards.
What the ratings mean for fit
The C-curve means the magnetic trip fires between 5× and 10× rated current — suited for loads with moderate inrush like small motors, transformers, or lighting banks. At 25 A nominal it handles a 4 kW three-phase motor on 400 V without nuisance tripping on start. The 6 kA breaking capacity is the maximum prospective fault current the device can safely interrupt — standard for final sub-circuits in most buildings. Pollution degree 3 and overvoltage category III confirm it is rated for fixed installations inside distribution boards, not for outdoor or wet locations. IP20 protection is the norm for enclosed panel gear — the terminals are finger-safe only when the distribution board cover is fitted. The 72 mm depth and 54 mm width fit standard 3-module DIN-rail cutouts; supply can enter from top or bottom.
Compliance and documentation
The RCBO is designed and tested to EN 60898 and IEC 60947-2, the two dominant standards for overcurrent protective devices in Europe and many other markets. Insulation voltage is rated 500 V and surge voltage resistance is 4 000 V. The 95% humidity limit covers most indoor environments except steam-cleaned areas. For specific RoHS, REACH, or UL documentation, the manufacturer provides compliance declarations on request.