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Siemens 3RH2122-2WB40 Coupling Contactor Relay: 2 NO + 2 NC, 24V DC

Siemens 3RH2122-2WB40 coupling contactor relay with 2 NO + 2 NC contacts.

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ManufacturerSiemens

Part number3RH2122-2WB40

Contacts 2 NO + 2 NC

Coil Voltage 24V DC

Control Voltage 0.85-1.85*Us

Terminal Type Spring-loaded

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2 Normally Open, 2 Normally Closed Contacts 24V DC Coil Voltage Integrated Varistor for Surge Protection Spring-Loaded Terminal Connections Frame Size S00

Product description

The Siemens 3RH2122-2WB40 is a coupling contactor relay equipped with 2 normally open (NO) and 2 normally closed (NC) contacts. It operates on a 24V DC coil voltage with a control voltage range of 0.85-1.85*Us. This relay features a plugged-on varistor for surge protection and utilizes spring-loaded terminals for its connections. It belongs to the frame size S00 and is designed for use in control circuits.

This relay is suitable for applications requiring DC control and protection against transient voltage surges, common in automated machinery and control panels. Industries such as manufacturing, robotics, and process automation can benefit from its protective features.

Stanlo Automation, your veteran-owned source for surplus industrial parts, offers the Siemens 3RH2122-2WB40. We ensure that our customers have access to high-quality, cost-effective components to keep their operations running smoothly.

Technical specifications

Contacts	2 NO + 2 NC
Coil Voltage	24V DC
Control Voltage	0.85-1.85*Us
Terminal Type	Spring-loaded
Frame Size	S00
Features	Plugged-on varistor

Common applications

Industrial Control

Automation Systems

Robotics

Machine Control

Surge Protection Circuits

Compatible systems

DC Control Systems Industrial Automation Panels

Also known as

Siemens 3RH2122-2WB40 relay Siemens varistor relay 3RH21 DC Relay with varistor

Replaces / compatible with

This relay is designed for DC control circuits needing surge protection. It is compatible with Siemens control systems requiring similar specifications.

Technical note

Expert tip

The varistor on the 3RH2122-2WB40 effectively clamps voltage transients, making it a robust choice for control circuits where power quality might be a concern.

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Frequently asked questions

What is the purpose of the varistor on the Siemens 3RH2122-2WB40?

The varistor plugged onto the Siemens 3RH2122-2WB40 acts as a surge protection device. It helps to absorb transient voltage spikes, protecting connected electronic components and ensuring the longevity of the relay.