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Siemens 3RT2037-3KB40 SIRIUS DC Power Contactor - 65A 24VDC

Siemens SIRIUS 3RT20 3-pole DC power contactor for PLC

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ManufacturerSiemens

Part number3RT2037-3KB40

Poles 3

Rated Current (AC-3e/AC-3) 65A

Rated Power (AC-3) 30kW @ 400V

Coil Voltage 24V DC

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3-pole design 65A AC-3e/AC-3 rating 24V DC coil Suitable for PLC outputs Integrated varistor for surge protection Screw main circuit terminals Spring-loaded control circuit terminals Size S2

Product description

The Siemens 3RT2037-3KB40 is a specialized 3-pole power contactor from the SIRIUS 3RT2 series, engineered for direct control from PLC outputs. Rated for 65A (AC-3e/AC-3) and 30kW at 400V, this Size S2 contactor features a 24V DC coil, making it suitable for low-voltage control applications. It includes an integrated varistor for coil protection and has both screw terminals for the main circuit and spring-loaded terminals for control and auxiliary circuits.

This contactor is ideal for applications requiring reliable switching of three-phase motors and electrical loads, particularly when interfaced with programmable logic controllers (PLCs). The integrated varistor protects sensitive PLC outputs from voltage spikes, and its suitability for PLC outputs makes it a preferred choice in modern automation systems.

Stanlo Automation, your trusted veteran-owned source for industrial surplus, offers the Siemens 3RT2037-3KB40. We provide reliable access to critical components with competitive pricing and fast, efficient delivery.

Technical specifications

Poles	3
Rated Current (AC-3e/AC-3)	65A
Rated Power (AC-3)	30kW @ 400V
Coil Voltage	24V DC
Auxiliary Contacts	1 NO + 1 NC
Main Circuit Terminals	Screw
Control Circuit Terminals	Spring-loaded
Size	S2
Integrated Varistor	Yes

Common applications

PLC Control

Motor Control

Industrial Automation

Process Control

Machine Building

Compatible systems

Directly compatible with PLCs having 24V DC outputs; functions as an interface between electronic control and high-power loads.

Also known as

Siemens SIRIUS 3RT2037-3KB40 3RT20373KB40 Siemens DC Contactor 24V

Replaces / compatible with

This Siemens 3RT2037-3KB40 is a suitable replacement for Siemens 3RT1044-3BB40 and offers enhanced features for modern PLC integration.

Technical note

Expert tip

The integrated varistor provides crucial protection for sensitive PLC outputs by clamping transient voltage spikes generated by the coil.

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Frequently asked questions

Why is the Siemens 3RT2037-3KB40 suitable for PLC outputs?

The Siemens 3RT2037-3KB40 is designed for direct PLC control due to its 24V DC coil and an integrated varistor that suppresses voltage spikes, protecting sensitive PLC output modules. This ensures reliable operation and longevity in automated systems.