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Siemens 3TH2040-0FB4 Contactor Relay | 4 NO, 24V DC, Diode/Varistor Option

Siemens 3TH2040-0FB4 4 NO Contactor Relay, 24V DC, EN 50011.

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ManufacturerSiemens

Part number3TH2040-0FB4

Type Contactor Relay

Manufacturer Siemens

Standard EN 50011

Auxiliary Contacts 40E (4 NO)

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4 NO auxiliary contacts 24V DC coil operation (1.2W) EN 50011 compliant Supports diode or varistor attachment Screw terminal connections Compact and modular

Product description

The Siemens 3TH2040-0FB4 is a contactor relay designed according to EN 50011 standards. It features 4 normally open (NO) auxiliary contacts, screw terminals, and operates with a 24V DC coil consuming 1.2W. It supports the attachment of a diode or varistor for surge suppression. This is a phased-out product.

This relay was utilized in complex control circuits requiring multiple NO contacts for functions like sequencing, interlocking, and switching in automation systems. It is common in motor control centers, process automation, and control panel construction. The successor is the SIRIUS 3RH21 series.

Stanlo Automation, a veteran-owned supplier of surplus industrial parts, offers the Siemens 3TH2040-0FB4. We help you maintain and upgrade your automation systems with reliable, cost-effective components.

Technical specifications

Type	Contactor Relay
Manufacturer	Siemens
Standard	EN 50011
Auxiliary Contacts	40E (4 NO)
Coil Voltage	24 V DC
Coil Power	1.2 W
Termination	Screw Terminal
Surge Suppression	Diode or Varistor Attachable
Status	Phased-out

Common applications

Control Circuits

Sequencing

Interlocking

Automation Systems

Motor Control Centers

Control Panel Building

Compatible systems

DC Control Systems PLC I/O Control Panels Sequencer Circuits

Also known as

Siemens 3TH2040-0FB4 Relay Siemens 4 NO Contactor Relay

Replaces / compatible with

The phased-out Siemens 3TH2040-0FB4 contactor relay is succeeded by the SIRIUS 3RH21 series, providing modern functionality for similar control applications.

Technical note

Expert tip

When using the attachable diode or varistor, ensure it is correctly installed to provide effective transient suppression for the 24V DC coil.

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Frequently asked questions

Can surge protection be added to the Siemens 3TH2040-0FB4 contactor relay?

Yes, the Siemens 3TH2040-0FB4 contactor relay is designed to have a diode or a varistor attachable for surge suppression, protecting the coil from voltage spikes.