3RT2027-1KB40

The Siemens SIRIUS 3RT2027-1KB40 contactor features a 24V DC coil (with a built-in varistor surge suppressor), 1NO+1NC auxiliary contacts, and threaded terminals. It is rated for AC-3 at 32A/15kW and has an S0 body suitable for 400V three-phase motor direct starting circuits.

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Siemens 3RT2027-1KB40 contactor 24V DC (built-in varistor surge suppressor) 1NO+1NC

Product Positioning

The Siemens SIRIUS 3RT2 series 3RT2027-1KB40 is an S0-type power contactor with an AC-3 rated current of 32A and a rated power of 15kW/400V. It can directly control the start and stop of a 3-pole motor circuit. This model has a 24V DC coil (with a built-in varistor surge suppressor) and is equipped with 1NO+1NC auxiliary contacts for interlocking, signal feedback, and other control circuits. The terminals are screw-type, ensuring efficient installation and disconnection, and meeting the requirements for long-term operation in industrial settings. Kenxin Motors is an authorized Siemens distributor, providing genuine Siemens products and comprehensive technical support to assist customers in selecting the right model and ensuring fast delivery.

Core Product Advantages and Features

S0 chassis, 32A/15kW direct start capability

The 3RT2027-1KB40 has a rated current of 32A and a rated power of 15kW/400V under AC-3 conditions. It belongs to the SIRIUS 3RT2 series S0 frame and is suitable for direct starting circuits of small and medium-sized three-phase motors. Its compact size and panel configuration save space.

The coil has a built-in suppression circuit to reduce the risk of induced surges.

The coil is rated for 24V DC (with a built-in varistor surge suppressor). The induced surge generated during switching is suppressed by the built-in component, which can reduce interference to the PLC output point or nearby control components and extend the stable operation life of the system.

1NO+1NC auxiliary contact, interlock signal in one step

It comes standard with 1NO+1NC instantaneous auxiliary contacts, which can simultaneously provide status feedback signals and interlock control, reducing the cost and wiring complexity of adding additional auxiliary contact sockets.

Threaded terminals save time during installation and maintenance.

Both the main circuit and the auxiliary circuit adopt screw-type terminals. The screw-locking method makes it easy for on-site personnel to directly install with existing tools and periodically check the torque.

project	Specification
Model (MLFB)	3RT2027-1KB40
Product Type	SIRIUS 3RT2 Power Contactor (S0 Frame)
Coil Specifications	24V DC (built-in varistor surge suppressor)
Rated operating current (AC-3, 400V)	32 A
Rated power (AC-3, 400V)	15 kW
Extreme number	3P (3 poles)
Main circuit contacts	3 NO (Normal Open)
Auxiliary contact configuration	1NO+1NC
Terminal type	Screw-type terminal
External dimensions	85×45×107 mm (height×width×depth)
weight	0.610 kg
Insulation voltage	690 V (Pollution Level 3)
Enclosure protection rating	IP20 (front)
Mechanical life	10 million times (typical)
Safety certification	UL File E31519; IEC/EN 60947-4-1
Installation method	35mm DIN rail clamping

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