3RT2026-1KB40

The 3RT2026-1KB40 is a 24V DC coil contactor with a built-in varistor to suppress switching surges. It has a holding power as low as 4.5W, an AC-3 rated power of 25A/11kW, and 1NO+1NC auxiliary contacts. The manufacturer also positions it as a coupling contactor, suitable for motor control panel interlocking circuits.

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Siemens 3RT2026-1KB40 24V DC Coupling Contactor 25A 11kW

Product Positioning

The 3RT2026-1KB40 is an S0 housing contactor in the SIRIUS 3RT2 series, specifically designed for 24V DC control circuits. It features a built-in varistor in the coil for surge suppression. According to the manufacturer, it is classified as a "coupled contactor," suitable for star-delta, forward/reverse, and other circuits requiring interlocking control between contactors. Its low pull-in power design also helps reduce the load on the control power supply and internal heat generation.

Core Product Advantages and Features

24V DC low-power coil

With a holding power of only 4.5W, it is suitable for direct drive by PLC or relay output, reducing the control power supply burden.

Built-in varistor surge suppression

The surge wave at the moment the coil is de-energized is absorbed by the varistor, protecting the surrounding electronic control components.

Coupling/Chain Application Orientation

The original manufacturer positioned it as a coupling contactor, suitable for circuits that require interlocking of multiple contactors, such as forward and reverse rotation, star-delta, etc.

The main circuit 25A/11kW meets the needs of most small and medium-sized motors.

The AC-15 auxiliary contact is 10A/230V, and the wiring margin for the interlocking circuit is sufficient.

project	Specification
model	3RT2026-1KB40
AC-3 rated current	25 A
AC-3 Rated Power (400V)	11 kW
Extreme number	3P
Coil Specifications	24 V DC, built-in varistor
Coil holding power	4.5 W
auxiliary contacts	1 NO + 1 NC (AC-15: 10A/230V)
Main circuit terminals	Screw terminals, can connect 1~10mm² wires.
External dimensions (H×W×D)	85×45×107 mm
net weight	Approximately 0.590 kg
Rated usage category	AC-3 (Motor Start/Stop)
Insulation voltage (pollution level 3)	690 V
Rated impulse withstand voltage	6 kV
Frontal protection level	IP20 (according to IEC 60529)
Mechanical life (typical value)	10 million cycles
Ambient operating temperature	-25°C ~ +60°C
Applicable Standards	IEC 60947-4-1 / IEC 60947-5-1
chassis code	S0
Installation method	35mm DIN rail or panel locking

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