The Siemens 5SU1336-7FP20 is a 3-pole RCBO (residual current operated circuit-breaker with overcurrent protection) from the SENTRON family, combining an RCD Type A (30 mA sensitivity) and an MCB with C-characteristic (20 A rated current) in one 3-module-wide unit. It protects against earth faults and overload/short-circuit in a single device, saving a DIN rail slot compared to separate units. Rated 400 V AC at 50 Hz, it carries a 6 kA breaking capacity per both EN 60898 and IEC 60947-2 — sufficient for most residential and light commercial distribution boards.
Fit and installation
At 54 mm wide (3 modular width units) and 72 mm deep, it fits a standard 70 mm installation depth enclosure. Mounting position is any, which helps when the board is laid out horizontally. IP20 rated with conductors connected and the distribution board installed — standard for enclosed panel use.
Energy limitation class 1 — check normative use limitations for your application, as class 1 allows higher let-through energy than class 3.