The Siemens 5SU9346-7CN20 is a SENTRON RCBO (RCD-operated circuit breaker) combining overcurrent and residual current protection in a single 4-pole module.
Depth of 77 mm and installation depth of 70 mm fit standard distribution boards; the 126 mm width and 90 mm height are within the envelope of a typical 4-pole RCBO. IP20 rating applies when installed in a distribution board with connected conductors — not a standalone enclosure rating. Mounting position is unrestricted. Supply can enter from top or bottom, which simplifies panel layout.
Rated insulation voltage 440 V, overvoltage category III, pollution degree 2 — suitable for fixed-installation mains circuits. Surge voltage resistance 4 kV, surge current resistance 1 kA (8/20 μs). Mechanical service life 10,000 operating cycles typical. Halogen-free and silicon-free construction.