5SY4220-8

What type of device is this and what does it do?

It is a miniature circuit breaker (MCB) designed to protect electrical circuits against overcurrent and short-circuit conditions by automatically disconnecting the circuit when thresholds are exceeded.

How many poles does it have, and what does that mean for my application?

It is a 2-pole breaker, meaning it switches and protects two conductors simultaneously. This is commonly used for two-phase circuits or for isolating both conductors of a single-phase circuit where a 2-pole device is required.

What are the rated voltage and current values?

The rated voltage is 400 V (AC; also specified for AC/DC use), and the rated current is 20 A.

What does the D tripping characteristic indicate?

A D-curve breaker is designed to tolerate higher inrush currents before instantaneous tripping, making it better suited to loads with high start-up currents (for example certain motors or transformers) compared with B or C curves.

What is the short-circuit breaking capacity?

It is rated 10 kA according to EN 60898 (Icn). Additional ratings are listed for other standards, including 20 kA in accordance with IEC 60947-2 (AC) and 15 kA in accordance with IEC 60947-2 (DC).

Which standards does it reference?

It references IEC/EN 60898-1 and IEC/EN 60947-2, and also UL 1077 (as noted in the technical data).

How is it mounted inside a panel?

It uses a quick assembly mounting system and is intended for modular installation on standard rail systems typically used for MCBs. It occupies 2 modular width units.

What are the physical dimensions?

The approximate dimensions are 90 mm (height) x 36 mm (width) x 76 mm (depth), with an installation depth of about 70 mm.

What cable sizes can be connected to the terminals?

Connectable conductor cross-sections are 0.75 to 35 mm² for solid and stranded conductors, and 0.75 to 25 mm² for finely stranded conductors with end processing (such as ferrules).

What tightening torque should be used for the screw terminals?

The specified tightening torque range is 2.5 to 3.5 N·m for the screw-type terminals.

Can the supply be connected from the top or bottom?

Yes. The device has combined terminals on both the top and bottom, and the power supply cord position is stated as any.

What environmental conditions is it designed to operate in?

The stated ambient temperature range during operation is -40 °C to +70 °C, and during storage is -40 °C to +75 °C.

Is it sealable for tamper indication?

Yes, it is specified as sealable (plombierbar). For reference, this is consistent with the feature set listed for Siemens 5SY4220-8.

Does it switch a neutral conductor?

No. Neutral conductor switching is specified as not present.

Is the product halogen-free and silicon-free?

Yes. It is specified as halogen-free and silicon-free.