3RT2017-1KB42

The AC-3 rated 12A/5.5kW/400V, 24V DC coil closing and holding power consumption is 2.8W, operating range is 0.7-1.25 times the rated voltage, net weight is approximately 281.8g, and it complies with IEC 60947-4-1 mirror contact safety specifications.

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Siemens 3RT2017-1KB42 contactor, 24VDC, 2.8W, 1NC safety rating.

Product Positioning

The 3RT2017-1KB42 is a Siemens SIRIUS 3RT20 series S00 frame contactor with a main circuit rated at 12A/5.5kW (400V) AC-3. The coil is designed for 24V DC operation, with an operating range of 0.7 to 1.25 times the rated voltage. The official datasheet indicates a closing and holding power of 2.8W each, and a net weight of approximately 281.8 grams. This model features one set of auxiliary normally closed contacts and mirror contact functionality compliant with IEC 60947-4-1 standards. It is suitable for machine designs requiring safety-related circuit breaking (such as emergency stop and safety door interlocking) and is mounted with screw terminals and a 35mm DIN rail.

Core Product Advantages and Features

Safety-related circuit breaker design

The mirror contact function conforms to IEC 60947-4-1 and can be used in safety-related circuit closure verification loops.

Electrical life measured data

Approximately 200,000 operating cycles (400V/4.1A) under AC-4 conditions, with a mechanical life of 30 million cycles.

Precise coil specifications

The closing and holding power is 2.8W, and the operating range is 0.7-1.25 times the rated voltage, as clearly stated in the official datasheet.

1 set of normally closed auxiliary contacts

It can be used for power failure feedback, interlock confirmation, or safety circuit signal transmission.

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
Coil power consumption (closed/held)	2.8W / 2.8W
auxiliary contacts	Group 1 normally closed (1NC)
Terminal type	Screw terminals, compatible with 0.5–4mm² wires.
net weight	Approximately 281.8 g
Main circuit insulation voltage	690V
Electrical life (AC-4)	Approximately 200,000 cycles (400V/4.1A)
Protection level	IP20 (Front)
Security-related certifications	Mirrored contacts conform to IEC 60947-4-1; UL/CSA

Recommend

3RT2017-1SB41

The 24V DC electronic coil has a measured closing and holding power consumption of only 1.6W, an operating range of 0.85-1.85 times the rated voltage, and supports AC-3 12A/5.5kW/400V. It has a built-in set of auxiliary normally open contacts, making it suitable for circuits that maintain engagement for extended periods.

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.

3RT2017-1JB42

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.