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Siemens 3RH2131-2KB40 Coupling Contactor Relay: 3 NO + 1 NC, 24V DC

Siemens 3RH2131-2KB40 coupling contactor relay with 3 NO + 1 NC contacts.

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ManufacturerSiemens

Part number3RH2131-2KB40

Contacts 3 NO + 1 NC

Coil Voltage 24V DC

Control Voltage 0.7-1.25*Us

Terminal Type Spring-loaded

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3 Normally Open, 1 Normally Closed Contact 24V DC Coil Voltage Integrated Suppressor Diode Spring-Loaded Terminal Connections Frame Size S00 Suitable for PLC Outputs

Product description

The Siemens 3RH2131-2KB40 is a coupling contactor relay designed with 3 normally open (NO) and 1 normally closed (NC) contacts. It operates on a 24V DC coil voltage with a control voltage range of 0.7-1.25*Us. This model includes an integrated suppressor diode for transient voltage suppression and uses spring-loaded terminals for connection. It is built in frame size S00 and is suitable for PLC outputs, but not expandable with auxiliary switches.

This relay is suited for control circuits where DC voltage is used and protection against voltage spikes is beneficial, especially when interfacing with sensitive electronic equipment like PLCs. Applications include general automation, control panel building, and machinery control.

Stanlo Automation, a veteran-owned surplus parts distributor, provides the Siemens 3RH2131-2KB40. Accessing quality surplus components from Stanlo helps ensure your automation systems remain operational and cost-effective.

Technical specifications

Contacts	3 NO + 1 NC
Coil Voltage	24V DC
Control Voltage	0.7-1.25*Us
Terminal Type	Spring-loaded
Frame Size	S00
Features	Integrated suppressor diode, suitable for PLC outputs

Common applications

Industrial Control Panels

PLC Interfacing

Automation Systems

DC Control Circuits

Machine Control

Compatible systems

PLC Outputs DC Control Systems Industrial Automation Panels

Also known as

Siemens 3RH2131-2KB40 relay Siemens DC coupling relay 3RH21 24V DC relay

Replaces / compatible with

This relay is designed for DC control circuits and PLC interfacing. Compatibility with specific PLC models should be confirmed based on voltage and current ratings.

Technical note

Expert tip

The spring-loaded terminals on the 3RH2131-2KB40 offer a secure, vibration-resistant connection, crucial for reliable operation in automated machinery.

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Frequently asked questions

What is the advantage of the integrated suppressor diode in the Siemens 3RH2131-2KB40?

The integrated suppressor diode in the Siemens 3RH2131-2KB40 protects sensitive electronic components, such as those in PLC outputs, from damaging voltage spikes. This enhances the reliability and lifespan of the connected equipment.