5SY4102-8

What type of device is this?

This is a miniature circuit breaker designed for low-voltage electrical distribution. It is a 1-pole unit rated at 2 A and is intended for use in applications where controlled overcurrent protection and reliable disconnection are required.

What is the rated current of this breaker?

The breaker is rated at 2 A for AC operation. That makes it suitable for low-current circuits where a compact protective device is needed.

What voltage is it designed for?

It is designed for 230 V single-phase AC systems and 400 V multi-phase AC systems. Datasheet information also identifies the device as suitable for AC/DC voltage types, which can be useful when reviewing panel compatibility.

What does the D tripping characteristic mean?

A D-curve breaker is intended for circuits with higher inrush currents than standard domestic loads. In practice, that means it is often considered for equipment such as certain motors, transformers or other inductive loads where a brief start-up surge is expected.

What is the short-circuit breaking capacity?

The device has a rated breaking capacity of 10 kA according to EN 60898. Siemens data for 5SY4102-8 also lists switching capacity values of up to 35 kA according to IEC 60947-2 and 15 kA for DC according to IEC 60947-2, depending on the standard and application context being referenced.

How much space does it take up in a panel?

It occupies 1 modular width unit and measures approximately 90 mm high, 18 mm wide and 76 mm deep, with an installation depth of 70 mm. This makes it suitable for compact DIN rail assemblies where space efficiency matters.

How is it mounted?

The breaker uses a quick assembly system for mounting and is designed for installation in any mounting position. That gives flexibility when laying out switchboards and control panels.

What cable sizes can be connected?

The terminals can accept solid conductors from 0.75 mm² to 35 mm², stranded conductors from 0.75 mm² to 35 mm², and finely stranded conductors with end treatment from 0.75 mm² to 25 mm². The coded AWG range is 18 to 4.

What tightening torque should be used for the terminals?

The screw-type terminals are specified for a tightening torque of 2.5 to 3.5 N·m. Using the correct torque helps achieve a secure electrical connection and consistent installation quality.

Can this breaker be sealed?

Yes. The device is listed as sealable, which can be useful in installations where the operating position should be restricted or visibly secured.

Does it support supplementary accessories?

Yes. Siemens lists this breaker as able to accommodate supplementary devices, which can be useful when building out a modular protection arrangement in a control cabinet.

What environmental conditions is it designed for?

Recent datasheet versions indicate an operating ambient temperature range of -40 °C to 70 °C and a storage range of -40 °C to 75 °C. The device is also listed with vibration resistance data according to IEC 60068-2-6, which is helpful for industrial environments.