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Siemens 3RH2140-2KB40 Coupling Contactor Relay - 24V DC

Siemens 3RH2140-2KB40 Coupling Contactor Relay.

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ManufacturerSiemens

Part number3RH2140-2KB40

Type Coupling Contactor Relay

Number of NO Contacts 4

Coil Voltage 24 V DC

Integrated Suppressor Diode Yes

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4 Normally Open Contacts Integrated Suppressor Diode 24V DC Coil Spring-loaded Terminals Suitable for PLC Outputs Frame Size S00

Product description

The Siemens 3RH2140-2KB40 is a specialized coupling contactor relay designed for integration with PLC outputs. It features 4 normally open (NO) contacts, a 24V DC coil, and an integrated suppressor diode to protect control circuitry. This relay operates within 0.7-1.25*Us and uses spring-loaded terminals. It is built for frame size S00 and is not expandable with auxiliary switches.

This relay is ideal for applications where a PLC needs to switch higher power loads or provide isolation. The integrated suppressor diode is crucial for protecting sensitive PLC outputs from voltage spikes. Its suitability for PLC outputs makes it a key component in modern automated systems.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RH2140-2KB40. We provide reliable, cost-effective solutions for your industrial automation needs, ensuring your systems remain operational with quality surplus components.

Technical specifications

Type	Coupling Contactor Relay
Number of NO Contacts	4
Coil Voltage	24 V DC
Integrated Suppressor Diode	Yes
Terminal Type	Spring-loaded
Frame Size	S00
PLC Output Compatible	Yes

Common applications

PLC Output Switching

Automation Control

Machine Interfacing

Process Control

Relay Logic

Motor Control

Compatible systems

Siemens SIMATIC PLCs Other PLCs with compatible output voltage and current ratings Industrial Control Systems

Also known as

Siemens 3RH2140-2KB40 Relay 3RH21402KB40 Siemens PLC Coupling Relay

Replaces / compatible with

This coupling contactor relay is designed to interface PLC outputs with control circuits, offering protection and isolation. It replaces the need for separate diodes and relays in many PLC applications.

Technical note

Expert tip

Due to the integrated suppressor diode and non-expandable nature, this relay is specifically designed for direct PLC output interfacing and cannot have additional auxiliary switches added.

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Frequently asked questions

What is the advantage of the integrated suppressor diode in the 3RH2140-2KB40?

The integrated suppressor diode in the Siemens 3RH2140-2KB40 protects sensitive PLC outputs from transient voltage spikes that can occur when the coil de-energizes. This enhances the longevity and reliability of the PLC.