A9F74110

What does this miniature circuit-breaker do?

This device is designed to protect distribution circuits against overloads and short circuits. It uses a thermal-magnetic trip mechanism, combining overload protection for sustained overcurrent conditions with magnetic tripping for higher fault currents.

What are the main electrical ratings?

It is a 1-pole miniature circuit-breaker rated at 10 A with a C curve. For AC applications, it is rated up to 240 V AC, with a 6 kA breaking capacity under IEC/EN 60898-1 and up to 10 kA under IEC/EN 60947-2 at 220 to 240 V AC.

What does a C curve mean in practice?

A C curve breaker is commonly chosen for circuits where moderate inrush current may occur, such as general commercial and industrial branch circuits. On this unit, the magnetic tripping limit is 8 x In +/- 20%, helping it tolerate brief start-up currents better than a more sensitive curve.

Is this suitable for single-phase circuits?

Yes. This is a 1-pole device intended for protection of a single live conductor in suitable AC or DC distribution applications, subject to the installation requirements and the relevant electrical standard.

Can this be mounted on a DIN rail?

Yes. It is designed for fixed mounting on a DIN rail, making it suitable for use inside standard distribution boards and control panels where DIN rail installation is required.

What are the physical dimensions of the unit?

The breaker measures 85 mm high, 18 mm wide and 78.5 mm deep. It occupies 2 modules of 9 mm pitch, which is useful when planning panel space.

What cable sizes can be connected?

The terminals accept single rigid conductors from 1 to 25 mm² and flexible conductors from 1 to 16 mm². The recommended wire stripping length is 14 mm, and the tightening torque is 2 N.m for top or bottom connection.

Can it be connected from the top or the bottom?

Yes. The terminal arrangement supports top or bottom connection, and it is also compatible with comb busbar and distribution block connection from either side.

Does this breaker include earth-leakage protection?

No. This is a standard miniature circuit-breaker without earth-leakage protection. Its purpose is overcurrent and short-circuit protection rather than residual current protection.

Is there any visual indication if the breaker trips?

Yes. The unit includes local trip indication as well as contact position indication, which helps users identify its status directly on the device.

What standards does this device conform to?

It is specified in line with EN 60898-1 and IEC 60898-1, as well as EN 60947-2 and IEC 60947-2. This makes it suitable for a range of low-voltage distribution applications where these standards are relevant.

What level of environmental protection does the enclosure provide?

The device has an IP20 protection rating. It is intended for installation within an appropriate enclosure or panel environment rather than exposed use.

What operating conditions is it designed for?

This miniature circuit-breaker is rated for operation in ambient temperatures from -35°C to 70°C and for storage from -40°C to 85°C. It is also specified for use at operating altitudes up to 2000 m and relative humidity up to 95% at 55°C.

Is the unit suitable for isolation?

Yes. It is specified as suitable for isolation in accordance with the relevant IEC and EN standards listed for the product.

What is the rated insulation and impulse withstand performance?

The unit has a rated insulation voltage of 500 V AC and a rated impulse withstand voltage of 6 kV. These figures reflect the insulation and transient withstand characteristics declared for this model, including A9F74110.