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Siemens 3RH2131-1FB40 Contactor Relay with Diode - 24V DC

Siemens 3RH2131-1FB40 3-pole auxiliary contactor relay with diode - 24V DC.

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ManufacturerSiemens

Part number3RH2131-1FB40

Coil Voltage 24 V DC

Contacts 3 NO + 1 NC

Terminal Type Screw

Frame Size S00

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CAGE: 9NK75

3 NO and 1 NC auxiliary contacts 24V DC coil Integrated suppression diode Screw terminal connections Frame size S00

Product description

The Siemens 3RH2131-1FB40 is an auxiliary contactor relay equipped with 3 normally open (NO) and 1 normally closed (NC) contacts. It operates on a 24V DC coil voltage and features an integrated suppression diode to protect control circuits from voltage spikes. Connections are made via screw terminals, and it is housed in a frame size S00.

This relay is ideal for applications in industrial automation, PLC output modules, and control panels where a DC coil voltage is used and protection against inductive load switching transients is required.

Source the Siemens 3RH2131-1FB40 from Stanlo Automation, a veteran-owned surplus parts distributor. We offer reliable, quality industrial components to ensure your automation systems are operational and efficient.

Technical specifications

Coil Voltage	24 V DC
Contacts	3 NO + 1 NC
Terminal Type	Screw
Frame Size	S00
Features	Integrated diode

Common applications

PLC outputs

Industrial automation

Control panels

Motor control

Signaling circuits

Automation systems

Compatible systems

PLCs and control systems with 24V DC outputs requiring inductive load protection

Also known as

Siemens 3RH21311FB40 3RH2131-1FB40 Contactor Siemens 24V DC Relay with Diode

Replaces / compatible with

This part is a Siemens 3RH21 series contactor relay with an integrated diode. It is compatible with Siemens 3RH21 accessories.

Technical note

Expert tip

The integrated diode provides fast suppression of back EMF. Ensure the diode's polarity is correctly oriented within the control circuit schematic.

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Frequently asked questions

What is the purpose of the integrated diode in the Siemens 3RH2131-1FB40?

The integrated suppression diode in the Siemens 3RH2131-1FB40 protects the control circuit from voltage spikes generated when the inductive coil is de-energized. This helps prevent damage to PLC outputs or other sensitive control components.