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Siemens 3RH1131-2KB40 3 NO + 1 NC DC Coupling Contactor

Siemens 3RH1131-2KB40 Coupling Contactor, 3 NO + 1 NC, 24V DC

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ManufacturerSiemens

Part number3RH1131-2KB40

Contact Configuration 3 NO + 1 NC

Coil Voltage 24V DC

Coil Voltage Range 0.7...1.25 * Us

Terminal Type Spring-loaded

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3 NO + 1 NC auxiliary contacts 24V DC coil with varistor Spring-loaded terminals Size S00 SIRIUS 3RH11 series Coupling contactor function

Product description

The Siemens 3RH1131-2KB40 is a coupling contactor within the SIRIUS 3RH11 series, featuring 3 normally open (NO) and 1 normally closed (NC) auxiliary contacts. It is designed for 24V DC operation with a coil voltage range of 0.7 to 1.25 times the rated voltage (Us). This Size S00 unit employs spring-loaded terminals for secure and vibration-resistant connections, and includes an integrated varistor for surge suppression.

This coupling contactor is specifically used for auxiliary functions in control circuits, particularly in combination with main contactors or as a component in more complex control sequences. Its DC coil and surge suppression make it ideal for sensitive electronic control systems and industrial automation where precise switching is crucial.

Stanlo Automation, a veteran-owned business specializing in surplus industrial automation parts, offers the Siemens 3RH1131-2KB40. We provide reliable access to these components, ensuring you can maintain and upgrade your systems with quality parts at a reduced cost.

Technical specifications

Contact Configuration	3 NO + 1 NC
Coil Voltage	24V DC
Coil Voltage Range	0.7...1.25 * Us
Terminal Type	Spring-loaded
Size	S00
Surge Suppression	Varistor
Series	SIRIUS 3RH11

Common applications

Auxiliary control functions

Control circuits

Automation systems

Motor control

Industrial machinery

PLC interfacing

Compatible systems

Suitable for integration into various DC control systems and automation panels where auxiliary switching is required.

Also known as

Siemens Coupling Contactor 3RH1131-2KB40 SIRIUS 3RH11 3RH1131-2KB40 Siemens 24V DC Coupling Relay

Replaces / compatible with

This is a phased-out product. The preferred successor is the Siemens 3RH2131-2LB40.

Technical note

Expert tip

The spring-loaded terminals on this Size S00 coupling contactor provide a secure connection resistant to vibration, crucial for reliable performance in mobile or heavy-duty equipment.

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Frequently asked questions

What is the purpose of the varistor in the Siemens 3RH1131-2KB40 coupling contactor?

The integrated varistor in the Siemens 3RH1131-2KB40 coupling contactor serves to suppress voltage spikes and surges on the coil circuit. This protects sensitive control components from transient overvoltages, ensuring more reliable operation.