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Siemens 3TH2031-0LB4 Contactor Relay - 24V DC, 3 NO + 1 NC

Siemens 3TH2031-0LB4 Contactor Relay - 24V DC

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ManufacturerSiemens

Part number3TH2031-0LB4

Contacts 3 NO + 1 NC

Coil Voltage 24V DC

Operating Range 0.7-1.25xUS

Surge Protection Connected varistor

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3 NO + 1 NC Auxiliary Contacts 24V DC Coil Voltage Integrated Varistor Surge Protection EN 50011 Standard Wide Operating Range

Product description

The Siemens 3TH2031-0LB4 is a 31E series contactor relay, compliant with EN 50011 standards. This relay features 3 normally open (NO) and 1 normally closed (NC) contacts, and is designed for DC operation with a coil voltage of 24V DC. It includes a connected varistor for surge protection and operates within a range of 0.7 to 1.25 times the nominal supply voltage (US).

This contactor relay is suitable for control circuits in industrial automation, machine tools, and power control applications where DC operation and surge protection are required.

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Technical specifications

Contacts	3 NO + 1 NC
Coil Voltage	24V DC
Operating Range	0.7-1.25xUS
Surge Protection	Connected varistor
Series	31E
Standard	EN 50011
Operation	DC

Common applications

Industrial Control Systems

Machine Tool Automation

DC Power Circuits

Control Panels

Compatible systems

Designed for DC control circuits, compatible with systems requiring 24V DC coil voltages and surge suppression.

Also known as

Siemens 31E DC Relay 3TH2031-0LB4 with Varistor

Replaces / compatible with

This product is phased-out. The successor is SIRIUS 3RH21.

Technical note

Expert tip

The integrated varistor helps protect the relay coil from voltage transients, especially in environments with unstable power sources.

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Frequently asked questions

Does the Siemens 3TH2031-0LB4 Contactor Relay offer surge protection?

Yes, the Siemens 3TH2031-0LB4 Contactor Relay comes with a connected varistor for built-in surge protection, enhancing its reliability in demanding environments.