3RT2045-1NF34

The Siemens 3RT2045-1NF34 is a Size S3, 3-pole contactor from the SIRIUS 3RT2 series. It has an AC-3 rated current of 80A and a power of 37kW (400V), and a control voltage of 84-155VAC/DC. It is equipped with 2NO+2NC auxiliary contacts.

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Siemens 3RT2045-1NF34 SIRIUS power contactor, Size S3 2NO2NC

Product Positioning

The Siemens 3RT2045-1NF34 power contactor is a Size S3, 3-pole design from the SIRIUS 3RT2 series. It has an AC-3 rated current of 80A and a rated current of 37kW (400V), suitable for motor control circuits requiring multiple feedback contacts. The Siemens 3RT2045-1NF34 controls voltages from 84-155VAC/DC, features 2NO+2NC auxiliary contacts and a built-in surge suppressor, and uses screw terminal connections. It is a successor to the 3RT1045-1BG44.

Core Product Advantages and Features

Size S3 standard contactor

AC-3 rated current 80A, 37kW (400V), suitable for general motor starting and switching.

Wide range control voltage 84-155VAC/DC

AC/DC universal coil, adaptable to different control power supply environments.

2NO+2NC auxiliary contacts

With a large number of contacts, it is convenient for multi-circuit monitoring and interlocking control.

Built-in surge suppressor

The protection control circuit features a screw terminal design for easy installation and maintenance.

project	Specification
Rated current (AC-3)	80 A
Rated power	37 kW / 400V
Extreme number	3 poles
Control/coil voltage	84-155 VAC/DC
Auxiliary contact configuration	2NO+2NC
Applicable series/Size	SIRIUS 3RT2 / Size S3
Terminal type	Screw terminals
feature	Built-in surge suppressor (Varistor)
Remark	This is a successor to the 3RT1045-1BG44.

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