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Siemens 3RH2122-2KB40 PLC Output Contactor Relay - 24V DC

Siemens 3RH2122-2KB40 coupling contactor relay for PLC outputs.

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ManufacturerSiemens

Part number3RH2122-2KB40

Contacts 2 NO + 2 NC

Coil Voltage 24V DC

PLC Output Compatible Yes

Terminal Type Spring-loaded

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CAGE: 9NK75

2 NO + 2 NC contacts Designed for PLC outputs Integrated suppressor diode Spring-loaded terminals Frame size S00 Not expandable with aux switches

Product description

The Siemens 3RH2122-2KB40 is a coupling contactor relay designed for direct interfacing with PLC outputs. It features 2 normally open (NO) and 2 normally closed (NC) contacts, a 24V DC coil voltage, and an integrated suppressor diode. This model utilizes spring-loaded terminals for secure connections and is built in frame size S00. It is specifically noted as not expandable with auxiliary switches.

This relay is engineered for applications where a PLC output needs to control a higher power circuit or provide isolation. Its suitability for PLC outputs, combined with its compact size and reliable spring terminals, makes it a practical choice for modern automation systems, including those found in the food and beverage, packaging, and material handling industries.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RH2122-2KB40. We provide access to quality industrial components at competitive prices, ensuring you can maintain and upgrade your automation systems efficiently. Partner with Stanlo Automation for reliable sourcing of your electrical and automation needs.

Technical specifications

Contacts	2 NO + 2 NC
Coil Voltage	24V DC
PLC Output Compatible	Yes
Terminal Type	Spring-loaded
Frame Size	S00
Suppressor Diode	Yes
Expandable	No

Common applications

PLC interfacing

Automation control

Machine building

Packaging machinery

Material handling

Compatible systems

Siemens S7 PLCs Other PLC systems with 24V DC outputs Automation control systems

Also known as

Siemens 3RH2122-2KB40 PLC relay Siemens 24V DC coupling relay

Replaces / compatible with

Designed as a direct interface for Siemens S7 and other compatible PLC systems.

Technical note

Expert tip

The 0.7-1.25*Us operating range ensures reliable engagement and disengagement even with varying PLC output voltages.

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Frequently asked questions

Can the Siemens 3RH2122-2KB40 be expanded with auxiliary contacts?

No, the Siemens 3RH2122-2KB40 is specifically designed not to be expandable with auxiliary switches. It is intended for direct PLC output interfacing where additional contacts are not required.