VW3A7723

What type of component is this?

This component is a braking resistor designed for use with compatible Schneider Altivar variable speed drives. It dissipates regenerative electrical energy as heat during motor deceleration.

What is the resistance value?

The resistor has a nominal resistance of 100 ohms.

What is its power rating?

The available average power is 28 W at an ambient temperature of 50 °C and 32 W at 40 °C.

Which variable speed drive ranges are compatible with this braking resistor?

VW3A7723 is intended for selected drives from the Altivar 12, Altivar 312, Altivar 312 Solar, Easy Altivar 310 and Easy Altivar 310L ranges. Compatibility should be confirmed against the exact drive model and application requirements.

Why is a braking resistor used with a variable speed drive?

A braking resistor helps a drive manage regenerative energy produced when a motor slows down rapidly or when an overhauling load drives the motor. The excess energy is converted into heat, supporting controlled deceleration.

What is the enclosure protection rating?

The component is rated IP00, meaning it does not have an enclosed level of protection against contact, solid objects or moisture. It should therefore be installed within a suitable enclosure.

What are the physical dimensions?

The braking resistor measures approximately 60 mm wide, 170 mm high and 30 mm deep.

How much does the component weigh?

Its net weight is approximately 0.605 kg.

Does the resistor generate heat during operation?

Yes. Its purpose is to convert regenerative electrical energy into heat, so adequate ventilation, clearance and heat-resistant mounting arrangements are important.

Where is this braking resistor typically installed?

It is typically mounted inside a suitably ventilated electrical enclosure near the compatible variable speed drive, while maintaining the specified clearances around the resistor.

Can it be selected using motor power alone?

No. Selection should also consider the exact drive model, braking frequency, deceleration time, load inertia, duty cycle, ambient temperature and the drive's permitted minimum braking resistance.

Is it suitable for frequent or rapid deceleration?

It can assist with rapid and repeated braking, but suitability depends on the energy generated by the application and the resistor's average power capability. The braking duty must be calculated before installation.

What happens to the energy absorbed during braking?

The resistor converts the regenerated electrical energy into thermal energy, which is then released into the surrounding air.

Can this component be installed in an exposed location?

Its IP00 rating makes exposed installation unsuitable. It should be housed in an appropriate enclosure that prevents unintended contact and protects it from environmental contaminants.

Does ambient temperature affect its power capability?

Yes. The stated average power is 32 W at 40 °C and reduces to 28 W at 50 °C, so enclosure temperature and ventilation should be considered during system design.