3RT2017-1JB42

The 24V DC coil has an operating range of 0.7-1.25 times the rated voltage. It is designed to be directly driven by a PLC digital output and does not require an additional auxiliary contact base. It is AC-3 12A/5.5kW/400V, weighs approximately 293g, and has a built-in 1NC.

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Siemens 3RT2017-1JB42 PLC Compatible Contactor 24VDC 1NC

Product Positioning

The 3RT2017-1JB42 is a Siemens SIRIUS 3RT20 series S00 frame contactor, with a main circuit rated at AC-3 12A/5.5kW (400V). The coil is designed for 24V DC, with an operating range of 0.7 to 1.25 times the rated voltage. Distributor information specifically notes that this coil can be directly driven by the PLC output stage, and no auxiliary contact modules can be added to the mechanism; it is an optimized version for direct PLC drive applications. It has one built-in auxiliary normally closed contact, weighs approximately 293 grams, and both the main circuit and control circuit use screw terminals, making it suitable for space-constrained distribution box designs where the PLC controls motor start and stop point-to-point.

Core Product Advantages and Features

PLC output direct drive design

The coil can be directly driven by the PLC digital output stage, eliminating the need for intermediate relays and simplifying the control circuit wiring.

Simplified structural design

This model does not allow for the addition of auxiliary contact modules, resulting in a more streamlined size and lower cost, making it suitable for simple start-stop circuits.

1 set of normally closed auxiliary contacts

It has a built-in 1NC auxiliary contact, which can be used as a power failure feedback or interlock signal.

S00 standard exterior

It adopts the 3RT20 series S00 frame design, which is convenient for parallel installation with existing contactors.

project	Specification
Product Type	SIRIUS 3RT20 Series Electric Contactors
Rated current (AC-3)	12 A
Rated power	5.5 kW / 400V AC
Extreme number	3P (3 poles)
Frame size	S00 (45mm wide × 58mm high × 73mm deep)
coil voltage	24V DC
Coil operating range	0.7–1.25 × rated voltage (PLC compatible type)
Auxiliary contacts	Group 1 normally closed (1NC)
Special design restrictions	No additional auxiliary contact modules can be added.
Terminal type	Screw terminals, compatible with 0.5–4mm² wires.
net weight	Approximately 293 g
Main circuit insulation voltage	690V
Protection level	IP20 (Front)
Mechanical life	30 million times
country of origin	Germany

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3RT2017-1KB41

Like the 1KB42, it belongs to the 24V DC, 2.8W coil family. The difference is that the auxiliary contacts are changed to one set of normally open contacts. It is AC-3 12A/5.5kW/400V, weighs approximately 296g, has an insulation voltage of 690V, and is suitable for general starting control circuits.

3RT2017-1JB41

Like the 1JB42, it belongs to the PLC direct drive coil family. The difference is that it has one set of normally open auxiliary contacts, AC-3 12A/5.5kW/400V, operating range 0.7-1.25 times the rated voltage, net weight approximately 294g, and it cannot be fitted with an additional auxiliary contact socket.

3RT2017-1HB42

The 24V DC coil has a closing and holding power consumption of 2.8W, an operating range of 0.7-1.25 times the rated voltage, a net weight of approximately 283g, and mirrored contacts conforming to IEC 60947-4-1, making it suitable for 1NC selection in safety interlocking circuits.