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Siemens 3TX4401-1A Auxiliary Switch Block - 1NC Screw Terminal

Siemens 3TX4401-1A Auxiliary Switch Block with 1NC screw terminal.

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ManufacturerSiemens

Part number3TX4401-1A

Type Auxiliary Switch Block

Contacts 1 NC

Terminal Type Screw

Standard EN 50012

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1 NC contact Screw terminal connection Designed for Siemens motor contactors High mechanical endurance IP20 protection Easy snap-on mounting

Product description

The Siemens 3TX4401-1A is an auxiliary switch block designed for use with motor contactors according to EN 50012 standards. It features a single normally closed (1NC) contact and utilizes screw terminals for secure electrical connections. This block is rated for 10A at 240V AC and offers a mechanical service life of 10,000,000 switching cycles. The IP20 protection class ensures safety during operation.

This auxiliary switch block is ideal for expanding the control and signaling capabilities of Siemens contactors in industrial automation applications. It is commonly used in machine building, control panels, and power distribution systems where auxiliary contacts are needed for status indication, interlocking, or control logic.

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Technical specifications

Type	Auxiliary Switch Block
Contacts	1 NC
Terminal Type	Screw
Standard	EN 50012
Rated Current	10A at 240V AC
Mechanical Service Life	10,000,000 cycles
IP Rating	IP20

Common applications

Motor control panels

Industrial automation

Machine control

Control circuits

Status indication

Interlocking circuits

Compatible systems

Siemens motor contactors (EN 50012)

Also known as

Siemens 3TX4401-1A

Replaces / compatible with

Compatible with Siemens motor contactors conforming to EN 50012.

Technical note

Expert tip

Ensure proper torque is applied to the screw terminals to guarantee a secure connection and prevent overheating.

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Frequently asked questions

What is the contact configuration of the Siemens 3TX4401-1A?

The Siemens 3TX4401-1A auxiliary switch block features one normally closed (1NC) contact. This configuration is used to provide a normally open signal when the contactor is de-energized and a normally closed signal when energized.