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Siemens 3RT1045-1BG40 SIRIUS Power Contactor

Siemens 3RT1045-1BG40 3-Pole Power Contactor

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ManufacturerSiemens

Part number3RT1045-1BG40

Type Power Contactor

Manufacturer Siemens

Part Number 3RT1045-1BG40

AC-3 Rating 80 A

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AC-3 rating 80A 37 kW @ 400V 125V DC coil 3-pole configuration Screw terminals Size S3

Product description

The Siemens 3RT1045-1BG40 is a 3-pole power contactor from the SIRIUS 3RT1 series, rated for AC-3 applications with an 80A current and 37 kW power at 400V. It is equipped with a 125V DC coil and utilizes screw terminals for its connections. This contactor is designated as Size S3.

This heavy-duty contactor is designed for reliable switching of motors and power loads in demanding industrial sectors. Its application spans across manufacturing, processing, and automation systems where high current loads need to be managed efficiently.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RT1045-1BG40. Partner with us for your industrial automation needs and ensure access to critical components for your existing machinery.

Technical specifications

Type	Power Contactor
Manufacturer	Siemens
Part Number	3RT1045-1BG40
AC-3 Rating	80 A
Power Rating	37 kW @ 400 V
Coil Voltage	125 V DC
Poles	3
Terminal Type	Screw terminal
Size	S3
Series	SIRIUS 3RT1

Common applications

Motor control

Industrial automation

Manufacturing

Processing

High-power switching

Control panels

Compatible systems

N/A (Component level)

Also known as

SIRIUS 3RT1045-1BG40 Siemens Contactor 3RT1045-1BG40 80A Contactor Siemens

Replaces / compatible with

This is a phased-out product. The preferred successor is the Siemens SIRIUS 3RT2038-1NF30.

Technical note

Expert tip

The 125V DC coil requires a stable DC power source; verify voltage regulation if using a converted AC supply.

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Frequently asked questions

What is the coil voltage and AC-3 rating for the Siemens 3RT1045-1BG40?

The Siemens 3RT1045-1BG40 power contactor has a 125V DC coil and is rated for AC-3 applications at 80A, with a power capacity of 37 kW at 400V.