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Siemens 3RT2026-1KB40 25A PLC Output Contactor

Siemens 3RT2026-1KB40 25A PLC output contactor with 24V DC coil.

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ManufacturerSiemens

Part number3RT2026-1KB40

Type Power Contactor

AC-3e/AC-3 Rating 25A

Max Power (400V) 11 kW

Poles 3

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PLC output compatible 25A current rating 24V DC coil with wide range 1 NO + 1 NC auxiliary contacts Integrated varistor Suitable for direct PLC interface

Product description

The Siemens 3RT2026-1KB40 is a 3-pole power contactor designed for AC-3e/AC-3 applications, rated at 25A and 11kW for 400V systems. It features a 24V DC coil with a 0.7-1.25* Uc range, making it suitable for PLC outputs. This size S0 contactor includes 1 normally open (NO) and 1 normally closed (NC) auxiliary contact, has a plugged-in varistor for surge suppression, and uses screw terminals. Importantly, no auxiliary switch can be added to this model.

This contactor is specifically designed for direct interfacing with PLC outputs, offering a reliable solution for switching higher power loads from low-voltage control signals. It is ideal for motor control, pump systems, fan control, and other applications in building automation, industrial machinery, and process control.

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Technical specifications

Type	Power Contactor
AC-3e/AC-3 Rating	25A
Max Power (400V)	11 kW
Poles	3
Coil Voltage	24 V DC (0.7-1.25* Uc)
Auxiliary Contacts	1 NO + 1 NC
Varistor	Plugged-in
PLC Compatible	Yes
Auxiliary Switch	Not Addable
Terminals	Screw
Size	S0

Common applications

Motor control

Industrial automation

PLC interfaces

Building automation

Pump systems

Fan control

Compatible systems

Siemens S7 PLCs Allen-Bradley ControlLogix Fanuc PLCs Mitsubishi PLCs

Also known as

Siemens 3RT2 Contactor 3RT2026 Contactor Siemens S0 Contactor PLC Contactor 3RT20261KB40

Replaces / compatible with

This contactor is designed to replace standard Siemens 3RT2026 series contactors where direct PLC output interfacing is required.

Technical note

Expert tip

This model is optimized for direct PLC output connection, eliminating the need for interposing relays in many applications, simplifying wiring and reducing panel space.

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Frequently asked questions

Why is the Siemens 3RT2026-1KB40 suitable for PLC outputs?

The Siemens 3RT2026-1KB40 is designed with a coil voltage range (0.7-1.25* Uc) that is compatible with typical PLC output voltages. It also includes integrated surge suppression, protecting the sensitive PLC output from back EMF.