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Siemens 3RH2131-2SB40 PLC Contactor Relay - 24V DC, Not Expandable

Siemens 3RH2131-2SB40 PLC Coupling Contactor Relay, 3 NO + 1 NC.

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ManufacturerSiemens

Part number3RH2131-2SB40

Type Coupling Contactor Relay

Contacts 3 NO + 1 NC

Coil Voltage 24V DC

Terminals Spring-loaded

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3 NO + 1 NC contacts 24V DC coil Integrated suppressor diode Spring-loaded terminals Suitable for PLC outputs Not expandable

Product description

The Siemens 3RH2131-2SB40 is a specialized coupling contactor relay designed for direct interface with PLC outputs. It features 3 NO + 1 NC contacts and operates with a 24V DC coil. This model includes a built-in suppressor diode and utilizes spring-loaded terminals for ease of installation and maintenance. Notably, it is not expandable with auxiliary switches and is optimized for PLC control.

This contactor relay is ideal for applications requiring direct switching from programmable logic controllers, such as in modern automation systems, process control, and machinery where compact, reliable interface solutions are necessary. Its design ensures compatibility and performance with PLC output modules.

Stanlo Automation, a veteran-owned supplier of surplus industrial parts, offers the Siemens 3RH2131-2SB40. We are dedicated to providing quality components and efficient service, ensuring your automation needs are met with reliable and cost-effective solutions.

Technical specifications

Type	Coupling Contactor Relay
Contacts	3 NO + 1 NC
Coil Voltage	24V DC
Terminals	Spring-loaded
Frame Size	S00
Features	Integrated suppressor diode, PLC compatible, Not expandable

Common applications

PLC control systems

Automation panels

Machine control

Process automation

Building automation

Compatible systems

Siemens S7 PLCs Allen-Bradley ControlLogix Other PLCs with 24V DC outputs

Also known as

Siemens 3RH2131-2SB40 SIRIUS Coupling Contactor Relay Siemens PLC Interface Relay

Replaces / compatible with

Designed specifically for direct PLC output interfacing, replacing the need for intermediate relays in some applications.

Technical note

Expert tip

The 0.85-1.85*Us operating range of the coil ensures reliable pickup and holding even with variations in PLC output voltage.

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Frequently asked questions

Why is the Siemens 3RH2131-2SB40 suitable for PLC outputs?

The Siemens 3RH2131-2SB40 is designed with a coil that can handle the voltage and current typically supplied by PLC output modules, minimizing the risk of damage to the PLC. The integrated suppressor diode also protects the PLC from back EMF.