3RT2017-2KF42

The Siemens SIRIUS 3RT2017-2KF42 is an electromagnetic contactor for traction/coupling. It is rated at 12A, 5.5kW/400V AC-3, and uses a 110V DC wide-range electronic coil with a built-in suppression diode. It is equipped with one set of normally closed auxiliary contacts and spring terminals, making it suitable for control systems powered by 110V DC power.

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Siemens 3RT2017-2KF42 Traction Contactor AC-3 12A 5.5kW 110V DC

Product Positioning

3RT2017-2KF42 is the ordering code for the 110V DC coil traction/coupling contactor in the Siemens SIRIUS 3RT2 series. It can be ordered directly using this model number (the manufacturer also provides batch versions with suffixes such as -1LA0). The AC-3 rating is consistent with the family, at 12A, 5.5kW/400V. The coil is a 110V DC wide-range electronic design, with an operating range of approximately 0.7 to 1.25 times the rated voltage. It also features a built-in suppression diode to reduce back EMF surges during power failure. The main circuit and control circuit use spring terminals and have one set of normally closed auxiliary contacts. The structure and electrical characteristics are the same as the 24V DC version (2LB42), the only difference being the coil voltage, allowing for flexible selection based on the DC control power supply voltage (24V or 110V) at the site.

Core Product Advantages and Features

110V DC wide-range electronic coil

The coil is rated at 110V DC, with an operating range of approximately 0.7 to 1.25 times the rated value, making it suitable for 110V DC control bus power supply systems.

Built-in suppression diode

Reduce the back electromotive force surge when the coil is de-energized to protect control circuit components.

1 set of normally closed auxiliary contacts and spring terminals

It has a built-in 1NC auxiliary contact for interlocking or feedback, and both the main circuit and the control circuit are spring terminals.

Electrical characteristics compatible with 24V DC version

It has the same electrical architecture as the 2LB42 (24V DC) version in the same series, only the coil voltage is different, making it easy to select according to the control power supply specifications.

project	Specification
Model (MLFB)	3RT2017-2KF42
Casing size	S00
Extreme number	3 poles
AC-3 rated current	12 A
AC-3 rated power	5.5 kW / 400V
Coil type	Electronic wide-range DC coil
coil voltage	110V DC (approximately 0.7~1.25 times the rated value)
Coil protection	Built-in suppression diode
auxiliary contacts	Built-in 1 NC
Terminal type	Spring terminals
Application type	Traction/Coupled Contactor

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