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Siemens 3TH2031-0BB4 Contactor Relay | 3 NO + 1 NC, 24V DC

Siemens 3TH2031-0BB4 3 NO + 1 NC Contactor Relay, 24V DC.

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ManufacturerSiemens

Part number3TH2031-0BB4

Type Contactor Relay

Manufacturer Siemens

Standard EN 50011

Auxiliary Contacts 31E (3 NO + 1 NC)

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3 NO + 1 NC auxiliary contacts 24V DC coil EN 50011 compliant Screw terminal connections Compact design for control panels DC operation

Product description

The Siemens 3TH2031-0BB4 is a contactor relay conforming to EN 50011 standards. It features 3 normally open (NO) and 1 normally closed (NC) auxiliary contacts, screw terminals, and operates with a 24V DC coil. This is a phased-out product.

This relay was commonly used in control circuits for logic functions, interlocking, and signaling within industrial automation systems. It is found in control panels for machinery, building automation, and process control. The successor is the SIRIUS 3RH21 series.

Stanlo Automation, a veteran-owned surplus parts distributor, provides the Siemens 3TH2031-0BB4. We help you source legacy and current industrial components, ensuring your automation systems remain operational.

Technical specifications

Type	Contactor Relay
Manufacturer	Siemens
Standard	EN 50011
Auxiliary Contacts	31E (3 NO + 1 NC)
Coil Voltage	24 V DC
Termination	Screw Terminal
Operation	DC
Status	Phased-out

Common applications

Control Circuits

Logic Functions

Interlocking Relays

Signaling

Automation Panels

Machine Control

Compatible systems

DC Control Systems PLC Input/Output Modules Control Panels

Also known as

Siemens 3TH2031-0BB4 Relay Siemens 31E Contactor Relay

Replaces / compatible with

The Siemens 3TH2031-0BB4 contactor relay is phased out and succeeded by the SIRIUS 3RH21 series, offering modern features and availability.

Technical note

Expert tip

This phased-out contactor relay requires a 24V DC coil voltage. Ensure proper wiring for the 3 NO and 1 NC auxiliary contacts.

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Frequently asked questions

What are the auxiliary contact configurations for the Siemens 3TH2031-0BB4 contactor relay?

The Siemens 3TH2031-0BB4 contactor relay is configured with 3 normally open (NO) and 1 normally closed (NC) auxiliary contacts, meeting the 31E designation.