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Siemens SIRIUS 3RW40 Soft Starter, 63A, 30kW, 200-480V AC

Siemens SIRIUS 3RW40 soft starter, 63A, 30kW, with thermistor protection.

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ManufacturerSiemens

Part number3RW4037-2TB04

Type Soft Starter

Manufacturer Siemens

Series SIRIUS 3RW40

Rated Current 63 A

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Smooth motor starting Reduced inrush current Thermistor motor protection Spring-type terminals Wide operating voltage range SIRIUS design

Product description

The Siemens 3RW4037-2TB04 is a SIRIUS soft starter with a rating of 63A and a maximum motor power of 30kW at 400V. It operates on a wide input voltage range of 200-480V AC and is equipped with spring-type terminals for 24V AC/DC control voltage. This soft starter includes built-in thermistor motor protection for enhanced safety and longevity of the motor.

This soft starter is designed to provide smooth, controlled starting of three-phase motors, reducing mechanical stress on equipment and electrical inrush current. It is widely used in applications such as conveyor systems, pumps, fans, and compressors across industries like manufacturing, mining, and water treatment.

Source your Siemens 3RW4037-2TB04 SIRIUS soft starter from Stanlo Automation. As a veteran-owned surplus parts distributor, we provide reliable and genuine components to ensure your industrial automation systems operate efficiently and without interruption.

Technical specifications

Type	Soft Starter
Manufacturer	Siemens
Series	SIRIUS 3RW40
Rated Current	63 A
Max Motor Power	30 kW (at 400V)
Input Voltage	200-480 V AC
Control Voltage	24 V AC/DC
Terminals	Spring-type
Protection	Thermistor motor protection
Operating Temperature	40 °C

Common applications

Motor control

Pump systems

Fan control

Conveyor belts

Compressors

Industrial machinery

Manufacturing automation

Compatible systems

Three-phase AC motors Control circuits with 24V AC/DC Motor protection relays

Also known as

Siemens SIRIUS soft starter 3RW40 63A starter Siemens motor starter 3RW4037-2TB04

Replaces / compatible with

Replaces older versions of SIRIUS 3RW40 soft starters or can be used in new installations requiring soft start capability.

Technical note

Expert tip

Ensure the internal thermistor contacts are correctly wired to a suitable monitoring relay or overload relay for proper motor protection functionality.

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Frequently asked questions

What type of motor protection is integrated into the Siemens 3RW4037-2TB04 soft starter?

The Siemens 3RW4037-2TB04 soft starter features integrated thermistor motor protection. This system uses temperature-sensitive resistors (thermistors) to monitor motor winding temperature and prevent overheating.