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Siemens 3RH1140-2KB40 SIRIUS Contactor Relay - 24V DC w/ Varistor

Siemens 3RH1140-2KB40 SIRIUS Contactor Relay with 4 NO, 24V DC, Varistor.

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ManufacturerSiemens

Part number3RH1140-2KB40

Coil Voltage 24V DC

Operating Range 0.7-1.25* Us

Contact Configuration 4 NO

Terminal Type Spring-type

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4 NO Contacts 24V DC Coil Integrated Varistor Spring-type Terminals Size S00 Overvoltage Protection

Product description

The Siemens 3RH1140-2KB40 is a 4-pole contactor relay from the SIRIUS series, engineered for DC control applications with enhanced surge protection. It features four normally open (NO) contacts and operates with a 24V DC coil, with a 0.7 to 1.25 Us operating range. This model includes a varistor for effective overvoltage suppression and utilizes spring-type terminals.

Housed in the compact S00 frame size, this relay is well-suited for control panels, automation systems, and industrial machinery requiring reliable 24V DC switching. The integrated varistor provides robust protection against voltage transients, ensuring the longevity of the coil and connected circuitry.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RH1140-2KB40. We provide high-quality industrial automation components and excellent service to meet your procurement needs.

Technical specifications

Coil Voltage	24V DC
Operating Range	0.7-1.25* Us
Contact Configuration	4 NO
Terminal Type	Spring-type
Surge Suppression	Varistor
Size	S00

Common applications

24V DC Control

Automation Systems

Industrial Machinery

Control Panels

Power Electronics

Compatible systems

24V DC control systems Automation panels Control cabinets Machinery with inductive loads

Also known as

Siemens SIRIUS 3RH1140-2KB40 DC Contactor Relay with Varistor 24V DC Surge Protected Relay

Replaces / compatible with

This is a phased-out product. The preferred successor type is 3RH2140-2KB40.

Technical note

Expert tip

The varistor in this relay is crucial for protecting the coil against inductive voltage kicks when the relay de-energizes, especially in systems with high switching frequencies.

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Frequently asked questions

What type of surge protection does the Siemens 3RH1140-2KB40 offer?

The Siemens 3RH1140-2KB40 contactor relay features an integrated varistor for overvoltage protection. This component effectively suppresses voltage spikes, safeguarding the relay's coil and connected control circuits.