3RT2027-2BB40

The Siemens SIRIUS 3RT2027-2BB40 contactor has a 24V DC coil, 1NO+1NC auxiliary contacts, and spring terminals. It is rated for AC-3 at 32A/15kW and has an S0 body, making it suitable for direct starting circuits of 400V three-phase motors.

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Siemens 3RT2027-2BB40 contactor 24V DC 1NO+1NC

Product Positioning

The Siemens SIRIUS 3RT2 series 3RT2027-2BB40 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 and is equipped with 1NO+1NC auxiliary contacts for interlocking, signal feedback, and other control circuits. The terminals are spring-loaded, ensuring efficient installation and disconnection, as well as high reliability, meeting the requirements of long-term operation in industrial settings. Kenxin Motors is an authorized Siemens distributor, providing original factory parts and complete 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 3RT2027-2BB40 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.

DC coil design, suitable for DC control panels

The coil voltage is 24V DC, which can be directly used with a 24V/220V DC control power supply. When integrated with PLC output and DC power supply, the wiring is simple and the circuit design is highly flexible.

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.

Spring-loaded terminals save time during installation and maintenance.

Both the main circuit and the auxiliary circuit adopt spring-loaded terminals. The crimping design can shorten wiring time and reduce the risk of terminals coming loose after long-term use.

project	Specification
Model (MLFB)	3RT2027-2BB40
Product Type	SIRIUS 3RT2 Power Contactor (S0 Frame)
Coil Specifications	24V DC
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	Spring-loaded terminals
External dimensions	102×45×107 mm (height×width×depth)
weight	0.643~0.646 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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