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Siemens 3RT1045-1BB44-3MA0 DC Contactor - 80A, 37kW, 24V DC

Siemens 3RT1045-1BB44-3MA0 is a DC-coil power contactor with a captive auxiliary switch.

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ManufacturerSiemens

Part number3RT1045-1BB44-3MA0

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 Captive auxiliary switch SUVA compliant

Product description

The Siemens 3RT1045-1BB44-3MA0 is a Size S3, 3-pole power contactor from the SIRIUS 3RT1 series, rated for AC-3 duty at 80A and 37kW at 400V. It features a 24V DC coil, 2 NO + 2 NC auxiliary contacts, and a captive auxiliary switch specifically for SUVA applications. This is a phased-out product, with the preferred successor being the SIRIUS 3RT2038-1KB44-3MA0.

This contactor is designed for DC control applications, incorporating a captive auxiliary switch which is often required for safety interlocks in specific industrial environments, such as those governed by SUVA (Swiss National Accident Insurance Fund) regulations.

Stanlo Automation, a veteran-owned distributor of surplus automation parts, offers components like the Siemens 3RT1045-1BB44-3MA0. We specialize in providing obsolete and hard-to-find parts to keep your operations running.

Technical specifications

AC-3	80 A
Power	37 kW / 400 V
Coil Voltage	24 V DC
Poles	3
Aux Contacts	2 NO + 2 NC
Special Feature	Captive auxiliary switch for SUVA
Size	S3
Terminals	Screw

Common applications

Industrial automation

DC control circuits

Safety interlocks

SUVA compliant machinery

Control panels

Compatible systems

Compatible with Siemens SIRIUS 3RT1 accessories and control systems requiring 24V DC coil control and integrated captive auxiliary switches for SUVA compliance.

Also known as

Siemens 3RT1045-BB44-3MA0 SIRIUS 3RT1 SUVA

Replaces / compatible with

This part is a phased-out product. The preferred successor is the Siemens SIRIUS 3RT2038-1KB44-3MA0.

Technical note

Expert tip

The captive auxiliary switch is integrated and cannot be easily removed, ensuring it meets specific safety requirements for applications like SUVA.

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Frequently asked questions

What is the purpose of the captive auxiliary switch on the Siemens 3RT1045-1BB44-3MA0?

The captive auxiliary switch on the 3RT1045-1BB44-3MA0 is specifically designed for SUVA applications, often used for safety interlocks and to ensure reliable status feedback in control circuits.