Home › Manufacturers › Siemens › 3RW4038-1BB04

Siemens

Siemens SIRIUS 3RW4038-1BB04 Soft Starter - 72A, 37kW

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

In Stock — Ready to Ship

ManufacturerSiemens

Part number3RW4038-1BB04

Type Soft Starter

Series SIRIUS 3RW40

Current Rating 72 A

Motor Power 37 kW at 400 V

Get a price for 3RW4038-1BB04

Response within 1 business hour

🛡

12-month warranty

All units tested

⚡

Same-day dispatch

Order by 2pm CST

🌐

Worldwide delivery

US, EU, Asia, Middle East

🎖

Veteran-owned

CAGE: 9NK75

Smooth Motor Acceleration Reduces Inrush Current Minimizes Mechanical Stress 72A Rating for up to 37kW Motors Wide Control Voltage Range

Product description

The Siemens SIRIUS 3RW4038-1BB04 is a soft starter designed to provide smooth and controlled acceleration for three-phase motors. Rated for 72 Amperes and capable of controlling motors up to 37 kW at 400 V (operating at 40°C ambient), it significantly reduces mechanical stress on machinery and electrical inrush currents. This model features screw terminals for secure connections and operates with a control voltage range of 200-480 V AC and 24 V AC/DC.

This soft starter is essential for applications where high starting torques can cause damage or system instability, such as conveyor belts, pumps, fans, compressors, and mixers. By gradually increasing motor voltage during startup, it minimizes jolts, wear, and energy surges, leading to extended equipment life and improved operational efficiency.

Stanlo Automation, a veteran-owned provider of industrial automation surplus, offers the Siemens SIRIUS 3RW4038-1BB04 soft starter. Find reliable and cost-effective motor control solutions for your industrial needs with Stanlo.

Technical specifications

Type	Soft Starter
Series	SIRIUS 3RW40
Current Rating	72 A
Motor Power	37 kW at 400 V
Control Voltage	200-480 V AC, 24 V AC/DC
Terminals	Screw
Ambient Temperature	40 °C

Common applications

Motor Control Panels

Pumps

Fans

Conveyors

Compressors

Mixers

Industrial Machinery

Compatible systems

Three-phase AC Induction Motors

Also known as

Siemens 72A Soft Starter SIRIUS 3RW40 Series

Replaces / compatible with

This soft starter is part of the Siemens SIRIUS 3RW40 family, designed as an alternative to direct-on-line or star-delta starters for smoother motor acceleration.

Technical note

Expert tip

Proper heat dissipation is crucial; ensure adequate ventilation and consider derating if ambient temperatures exceed 40°C.

What happens next?

Email confirmation

Immediate receipt acknowledgment sent to you

Account manager assigned

Confirms your part's spec and condition

Your quote delivered

Tailored to your specific requirements

Frequently asked questions

What is the maximum motor power that the Siemens 3RW4038-1BB04 soft starter can control?

The Siemens 3RW4038-1BB04 SIRIUS soft starter can control three-phase motors up to 37 kW at a 400 V supply voltage, with a current rating of 72 A.