5SU1656-7KK32

What does this device do in an electrical distribution board?

It is an RCBO (Residual Current Breaker with Overcurrent protection) that combines two functions in one module: protection against overload/short-circuit (like an MCB) and protection against earth leakage (like an RCD). It is a 1P+N design, switching both live and neutral.

What are the rated current and operating voltage?

Rated current is 32 A at 30 °C ambient. The rated operating voltage is 230/240 V AC at 50 Hz (AC supply).

What tripping characteristic does it have, and when is it typically used?

It has a C-type tripping characteristic, commonly selected for circuits with moderate inrush currents (for example, certain lighting loads and small motors), where avoiding nuisance trips is important compared with B-curve devices.

What residual current type and sensitivity does it provide?

It is Type A residual-current protection with a sensitivity of 300 mA. Type A is intended to detect alternating residual currents and pulsating DC residual currents.

What short-circuit breaking capacity does it offer?

Its rated short-circuit breaking capacity (Icn) is 6 kA according to EN 61009-1. It also states 6 kA according to EN 60898 and 15 kA according to IEC 60947-2.

How many poles are included, and how is the neutral treated?

It is a 2-pole device in a 1P+N configuration. One pole is protected and the neutral is switched, which helps isolate the circuit while maintaining the intended protection scheme.

What is the module width and overall size?

It occupies 2 modular width units (36 mm). Typical dimensions are 90 mm (height) × 36 mm (width) × 77 mm (depth), with an installation depth of about 70 mm.

What conductor sizes can be connected to the terminals?

Solid conductors: 0.75 to 35 mm². Stranded conductors: 0.75 to 35 mm². Finely stranded conductors with end processing (for example, ferrules): 0.75 to 25 mm².

What terminal tightening torque should be used?

For the screw-type terminals, the specified tightening torque range is 2.5 to 3.0 N·m.

Can the supply be connected from the top or the bottom?

Yes. The power supply connection can be made either from the top or from the bottom, depending on the distribution board layout.

How does ambient temperature affect the usable current rating?

The current rating is temperature dependent. Examples given include 32 A at 30 °C, 30.4 A at 40 °C, 29.76 A at 45 °C, 28.8 A at 50 °C, and 27.84 A at 55 °C. This is useful when sizing circuits in warmer enclosures.

What are the operating and storage temperature ranges?

Operating ambient temperature range is -25 °C to +55 °C. Storage ambient temperature range is -40 °C to +75 °C.

What ingress protection rating applies once installed?

It is rated IP20 when installed in a distribution board with connected conductors.

What is the typical internal power loss?

Maximum power loss is stated as 5.7 W, which can be helpful when considering enclosure temperature rise and spacing.

Are there any material features noted for panel-building requirements?

Yes. Product features include halogen-free and silicon-free construction. If you need to reference it internally, this corresponds to Siemens part 5SU1656-7KK32.