3RT2017-2KB42

Siemens 3RT2017-2KB42 DC Electromagnetic Contactor 24VDC 12A/5.5kW 1NC
Siemens 3RT2017-2KB42 DC Electromagnetic Contactor 24VDC 12A/5.5kW 1NC

The Siemens SIRIUS 3RT2017-2KB42 is an S00 miniature contactor with a 24V DC coil, one set of normally closed (NC) auxiliary contacts, AC-3 rated 12A, 5.5kW, and spring terminal quick wiring.

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Siemens 3RT2017-2KB42 DC Electromagnetic Contactor 24VDC 12A/5.5kW 1NC
Product Positioning

The 3RT2017-2KB42 belongs to the SIRIUS 3RT20 S00 frame three-pole contactor. Its main circuit is rated at 12A and 5.5kW under AC-3 400V, using a 24V DC coil, with an operating range of 0.7~1.25 times the rated voltage, and is equipped with one set of NC (normally closed) instantaneous auxiliary contacts. The coil also has a built-in suppression diode. The official description states that no external auxiliary contact module can be added to the main unit; when selecting this model, it is necessary to confirm whether the direction of the NC contacts meets the circuit interlocking requirements.

Core Product Advantages and Features
24V DC low-voltage coil design
The coil is rated at 24V DC and has an operating range of 0.7 to 1.25 times the rated value, making it suitable for automated control panels that primarily use 24V DC power.
1 set of NC auxiliary contacts
It has a built-in normally closed instantaneous contact, which can be directly used in interlocking circuits, fault reporting, or control logic that needs to be turned on when power is cut off.
Spring-loaded screwless terminals
Both the main circuit and the control circuit use spring clip terminals, which allows for quick wiring and eliminates the need for periodic screw tightening, reducing maintenance time.
S00 has a compact body and is lightweight.
The unit weighs only 0.316kg and features IP20 finger-touch protection and 690V insulation voltage, making it suitable for dense placement inside distribution boxes.
project Specification
Rated operating current (AC-3, 400V) 12 A
Rated operating power (AC-3, 400V) 5.5 kW
Main contact type 3NO (3-pole normally open)
Coil voltage/type 24 V DC, operating range 0.7~1.25 times rated value
Auxiliary contact 1 NC instantaneous contact
Special features With a built-in suppression diode, the main body cannot be fitted with an auxiliary contact module.
Terminal blocks Spring-type terminals
External dimensions (packaging specifications) 50 x 73.5 x 77.5 mm
weight 0.316 kg
Enclosure protection level IP20 (finger touch protection)
Insulation voltage/contamination level 690 V / Pollution level 3
Frame size S00
Place of origin Germany
RoHS Compliant (since October 2009)

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