3RW3014-1BB04

What does this soft starter do in a motor circuit?

It reduces the inrush current and mechanical shock during motor start by ramping up the applied voltage using thyristors. This helps limit voltage dips and reduces stress on couplings, belts and gearboxes compared with direct-on-line starting.

What motor size is it typically suited to?

It is typically used for smaller three-phase motors, up to around 3 kW at 400 V in a standard circuit at 40 °C, with an operational current rating of 6.5 A at 40 °C.

What supply voltage range can it run on for the main (power) circuit?

The main circuit operating voltage range is 200 to 480 V AC (50/60 Hz), suitable for many common three-phase industrial supplies.

What control supply is required?

The control electronics use 24 V AC/DC. This is separate from the motor supply and is used for the control inputs and internal electronics.

Does it include an integrated bypass?

Yes. It includes an integrated bypass contact system, allowing the current to be carried by bypass contacts after ramp-up to reduce heat generation in steady operation.

Does it provide motor overload protection?

No. Motor overload protection is not included, so an appropriate external overload protection method should be used where required by the application.

Can it be used for soft stop as well as soft start?

This model is intended for soft starting for standard applications. If your application needs controlled deceleration (for example to reduce water hammer in pumping), you should confirm the required stop behaviour at the system level.

Is current limiting adjustable on this unit?

No. Adjustable current limitation is not available on this model.

Does it support an inside-delta (six-lead) connection?

No. An inside-delta circuit option is not provided on this unit; it is designed for standard in-line soft starter connection.

What auxiliary contacts are available?

It provides 1 normally open (NO) auxiliary contact and no normally closed (NC) or changeover auxiliary contacts.

What type of terminals does it use?

It uses screw-type terminals for both the main current circuit and the auxiliary/control circuit.

What enclosure protection and touch protection does it have?

The front is rated IP20 and is finger-safe for vertical contact from the front when installed correctly within a suitable panel or enclosure.

What are the operating temperature limits?

Typical ambient temperature range during operation is -25 °C to +60 °C, with derating starting at 40 °C depending on installation conditions.

How much space should be left around it for installation?

For side-by-side mounting, typical spacing guidance is 60 mm above, 15 mm to the side, and 40 mm below to help maintain airflow and thermal performance.

What are the overall dimensions?

Approximate dimensions are 45 mm (width) x 95 mm (height) x 150 mm (depth), corresponding to size S00.

Is there a status or fault indication on the device?

Yes. A red fault indication is provided on the device for basic visual signalling.

Can it be used at higher altitudes?

Installation altitude is specified up to 5,000 m above sea level; however, electrical equipment may require derating depending on temperature and ventilation in the panel.

What is the typical power loss during operation?

Typical active power loss during the operating phase at operational current and 40 °C is around 0.5 W, helped by the integrated bypass once running.

What is a common use case for this soft starter?

It is commonly used to start small three-phase motors on applications such as pumps, fans, conveyors and compressors where reducing starting stress and inrush current is beneficial. For reference, the unit is often supplied as Siemens 3RW3014-1BB04.