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Siemens 3RT1045-1BB44 DC Contactor - 80A, 37kW, 24V DC

Siemens 3RT1045-1BB44 is a 3-pole DC-coil power contactor.

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ManufacturerSiemens

Part number3RT1045-1BB44

AC-3 80 A

Power 37 kW / 400 V

Coil Voltage 24 V DC

Poles 3

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AC-3 rating 80A 37kW at 400V 24V DC coil 2 NO + 2 NC auxiliary contacts Size S3 Screw terminals

Product description

The Siemens 3RT1045-1BB44 is a 3-pole power contactor from the SIRIUS 3RT1 series, designed for AC-3 duty at 80A and 37kW at 400V. This unit features a 24V DC coil and includes 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts. It is a Size S3 contactor with screw terminals and is a phased-out product, with the preferred successor being the SIRIUS 3RT2038-1KB44.

This DC-coil contactor is suitable for applications requiring direct current control, commonly found in industrial automation, battery-powered systems, and specialized machinery where DC control voltage is utilized.

Stanlo Automation, a veteran-owned distributor of surplus automation parts, provides access to discontinued components like the Siemens 3RT1045-1BB44, helping you maintain and repair your existing equipment effectively.

Technical specifications

AC-3	80 A
Power	37 kW / 400 V
Coil Voltage	24 V DC
Poles	3
Aux Contacts	2 NO + 2 NC
Size	S3
Terminals	Screw

Common applications

DC motor control

Industrial automation

Battery systems

Control panels

Machine controls

Compatible systems

Compatible with Siemens SIRIUS 3RT1 accessories and control systems requiring 24V DC coil control.

Also known as

Siemens 3RT1045-BB44 SIRIUS 3RT1 DC

Replaces / compatible with

This part is a phased-out product. The preferred successor is the Siemens SIRIUS 3RT2038-1KB44.

Technical note

Expert tip

Ensure the control circuit is wired for 24V DC to properly energize the coil of this contactor.

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Frequently asked questions

What type of coil does the Siemens 3RT1045-1BB44 use?

The Siemens 3RT1045-1BB44 power contactor uses a 24V DC coil for operation. It also includes 2 normally open and 2 normally closed auxiliary contacts.