3RT2026-2KB40

Siemens 3RT2026-2KB40 Coupling Contactor 24V DC 25A/11kW with Built-in Resistor
Siemens 3RT2026-2KB40 Coupling Contactor 24V DC 25A/11kW with Built-in Resistor

S0 frame-coupled power contactor, AC-3 rated 25A/11kW (400V), 24V DC coil with built-in rheostat suitable for PLC output direct drive, spring terminal, 1NO+1NC auxiliary contact.

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Siemens 3RT2026-2KB40 Coupling Contactor 24V DC 25A/11kW with Built-in Resistor
Product Positioning

The Siemens SIRIUS 3RT2026-2KB40 is an S0 frame coupling contactor with a rated AC-3 main circuit of 25A/11kW (400V). The coil operates at 24V DC and has a built-in rheostat for surge suppression. The manufacturer positions it as a coupling contactor suitable for direct drive of PLC output points, which can reduce the risk of damage to PLC output transistors caused by surges when the coil is de-energized. The spring terminal wiring also facilitates machine maintenance and replacement.

Core Product Advantages and Features
PLC output direct drive design
The official classification of this model is "coupling contactor". The coil has a built-in rheostat that can absorb the induced surge during power failure. It is suitable for direct drive by PLC digital output point without the need for additional external protection circuit.
24V DC built-in rheostat coil
The coil voltage is 24V DC, the operating range is 0.7–1.25 times the rated voltage, and the rheostat is a pluggable module, which can be replaced individually in case of failure without replacing the entire contactor.
25A/11kW main circuit
The AC-3 has a rated current of 25A and corresponds to 11kW at 400V. The S0 frame is compatible with the main contacts of the 3RT2026 in the same series, and it can be used for direct starting of general motors such as pumps and fans.
Spring terminal ×1NO+1NC
The main and auxiliary circuits use spring-loaded screwless terminals, with one normally open and one normally closed auxiliary contact built in, which facilitates feedback of the contactor status to the control system.
project Specification
Coil voltage/type 24 V DC (built-in rheostat suppression)
AC-3 Rated Current 25 A
AC-3 Rated Power (400V) 11 kW
Rated operating voltage Up to 690 V AC
Rated insulation voltage Ui 690 V
Rated impulse withstand voltage Uimp 6 kV
Main circuit type 3. Normally Open (3NO)
auxiliary contacts 1 NO + 1 NC Instantaneous
Terminal type Spring-loaded (screwless quick-connect terminal)
Mechanical life 10,000,000 times
Protection level IP20 (Front end of terminal)
Pollution level Level 3
External dimensions (width × height × depth) 45×102×107 mm
weight Approximately 0.638 kg

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