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Siemens 3RH1122-1VB40 Contactor Relay - 2 NO, 2 NC, 24V DC

Siemens 3RH1122-1VB40 contactor relay, 2 NO/2 NC, 24V DC.

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ManufacturerSiemens

Part number3RH1122-1VB40

Type Contactor Relay

Contacts 2 NO + 2 NC

Coil Voltage 24V DC

Integrated Diode Yes

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2 Normally Open contacts 2 Normally Closed contacts 24V DC coil Integrated suppression diode Size S00 Screw terminals Auxiliary circuit control

Product description

The Siemens 3RH1122-1VB40 is a contactor relay for auxiliary circuits, featuring 2 Normally Open (NO) and 2 Normally Closed (NC) contacts. It is designed for a 24V DC coil voltage and includes an integrated suppression diode for coil protection. This relay uses screw terminals and is in size S00. It is important to note that this is a phased-out product, with the SIRIUS 3RH2 series being its successor, and the preferred replacement being the 3RH2122-1VB40.

This relay is used in control panels and automation systems where a 24V DC control signal is employed for interlocking, signaling, or auxiliary switching functions. The integrated diode provides protection against voltage spikes when the coil is de-energized, enhancing system reliability.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RH1122-1VB40. While phased-out, we can assist in sourcing this component or guide you to its modern successor for your automation needs.

Technical specifications

Type	Contactor Relay
Contacts	2 NO + 2 NC
Coil Voltage	24V DC
Integrated Diode	Yes
Terminal Type	Screw Terminal
Size	S00
Status	Phased-out product

Common applications

Control panels

Automation systems

DC control circuits

Interlocking

Signaling

Machine control

PLC outputs

Compatible systems

24V DC control circuits Automation control panels PLC outputs SIRIUS 3RH1/3RH2 series control

Also known as

Siemens SIRIUS 3RH11 DC Contactor Auxiliary Relay

Replaces / compatible with

The Siemens 3RH1122-1VB40 is a phased-out product. Its preferred successor is the 3RH2122-1VB40 within the SIRIUS 3RH2 series, offering similar functionality with updated design and support.

Technical note

Expert tip

The integrated diode in the 3RH1122-1VB40 is crucial for preventing back EMF. When replacing, ensure the successor part also includes appropriate coil suppression or external suppression is added.

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Frequently asked questions

Does the Siemens 3RH1122-1VB40 contactor relay have coil protection?

Yes, the Siemens 3RH1122-1VB40 contactor relay features an integrated suppression diode. This diode protects the coil from voltage spikes when the relay is de-energized, enhancing the longevity of the component and system stability.