The Siemens 5SU1653-7KK10 is a SENTRON RCBO (residual current circuit breaker with overcurrent protection) in a 2-module-width (36 mm) housing, combining a 10 A MCB with a 300 mA Type A RCD in one unit. It's designed for 230/240 V AC, 50 Hz single-phase circuits where you need both overcurrent and earth-fault protection in a single DIN-rail device — common in distribution boards for commercial or light industrial final circuits.
What the ratings mean for fit
The 10 A rated current and C tripping characteristic handle moderate inrush loads. The 300 mA Type A residual current detects sinusoidal AC and pulsed DC faults. Breaking capacity is rated at 4.5 kA per EN 60898 and 15 kA per IEC 60947-2. The EN 60898 figure governs installation in a domestic or commercial distribution board where the prospective short-circuit current (PSCC) is under 4.5 kA. The 15 kA IEC rating applies when the RCBO is used in an industrial context per IEC 60947-2 — for example, in a panel with a transformer feeding a higher fault-current bus. That dual rating gives you flexibility: it's certified for both standards, so you can specify it into either type of assembly without a separate industrial-grade device.
Integration and mounting
Snaps onto standard 35 mm DIN rail. At 2 MW (36 mm wide, 2 module widths), it occupies two adjacent slots in a distribution board or sub-panel. The 77 mm depth and 70 mm installation depth mean it fits flush in most enclosures — no extra clearance needed behind the rail. Supply can enter from top or bottom, and the neutral conductor is switched internally, so you don't need a separate neutral bar for the protected circuit. Mounting position is any orientation, which helps in tight enclosures or when the rail is vertical. IP20 rated when installed in a distribution board with conductors connected — standard for enclosed panel use, not for wet or outdoor locations without a weatherproof enclosure. Halogen-free and silicon-free construction matters in environments where outgassing during a fault could contaminate sensitive equipment or where silicone vapors interfere with paint or bonding processes.