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Siemens 3RH2122-2FB40 Contactor Relay - 2 NO, 2 NC, 24V DC

Siemens 3RH2122-2FB40 Contactor Relay with 2 NO + 2 NC contacts.

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ManufacturerSiemens

Part number3RH2122-2FB40

Contacts 2 NO + 2 NC

Coil Voltage 24V DC

Terminal Type Spring-loaded

Frame Size S00

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Veteran-owned

CAGE: 9NK75

2 NO + 2 NC auxiliary contacts 24V DC coil voltage Integrated suppressor diode Spring-loaded terminal connections Frame size S00

Product description

The Siemens 3RH2122-2FB40 is a versatile contactor relay featuring 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts. It operates on a 24V DC control voltage and includes an integrated diode for surge suppression. This relay is equipped with spring-loaded terminals for secure and reliable connections and is housed in frame size S00, making it compact for various industrial applications.

This contactor relay is ideal for use in control circuits, signaling, and auxiliary functions within motor control systems, automation equipment, and building management systems. Its robust design and integrated features ensure reliable operation across a range of industrial environments, including manufacturing, process control, and power distribution.

Source your Siemens 3RH2122-2FB40 from Stanlo Automation, a veteran-owned distributor specializing in surplus industrial automation parts. We offer competitive pricing and a commitment to providing high-quality components to keep your operations running smoothly. Trust Stanlo Automation for your essential control and automation needs.

Technical specifications

Contacts	2 NO + 2 NC
Coil Voltage	24V DC
Terminal Type	Spring-loaded
Frame Size	S00
Integrated Diode	Yes

Common applications

Motor control

Automation systems

Control panels

Signaling circuits

PLC interface

Compatible systems

PLC outputs Control systems Automation panels

Also known as

Siemens 3RH2122-2FB40 relay Siemens auxiliary contactor

Replaces / compatible with

This part is a standard Siemens 3RH21 contactor relay, designed for general automation applications.

Technical note

Expert tip

The integrated diode effectively suppresses voltage spikes generated by the coil, protecting downstream components in 24V DC control circuits.

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Frequently asked questions

What is the coil voltage and contact configuration of the Siemens 3RH2122-2FB40?

The Siemens 3RH2122-2FB40 operates with a 24V DC coil voltage and features a contact configuration of 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts.