3RT20172KF420LA0

The Siemens SIRIUS 3RT2017-2KF42-0LA0 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. It has a built-in suppression diode and an external series resistor, and is equipped with one set of normally closed auxiliary contacts and spring terminals.

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Siemens 3RT2017-2KF42-0LA0 Traction Contactor AC-3 12A 5.5kW 110V DC

Product Positioning

The 3RT2017-2KF42-0LA0 is a traction/coupling contactor version of the Siemens SIRIUS 3RT2 minimum frame S00. Its AC-3 rating is consistent with the same series: 12A, 5.5kW/400V. Unlike the 24V DC or 110V AC specifications, this unit is specifically designed for 110V DC control power supplies. The coil can operate normally within a voltage range of 0.7 to 1.25 times the rated voltage. It also features a built-in suppression diode and an external series resistor to reduce the impact of voltage surges in the control circuit during power outages. Both the main circuit and control circuit use spring terminals and have one set of normally closed auxiliary contacts, making it suitable for rail vehicles, battery storage, or other automation systems powered by DC buses.

Core Product Advantages and Features

110V DC wide-range electronic coil

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

Built-in suppression diode

The coil circuit integrates a suppression diode to reduce the back electromotive force surge generated at the moment of power failure.

External series resistor design

It uses an external (plug-on) series resistor, which is convenient to replace directly during maintenance without rewiring.

1 set of normally closed auxiliary contacts and spring terminals

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

project	Specification
Model (MLFB)	3RT2017-2KF42-0LA0
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 (0.7~1.25 times rated value)
Coil protection	Built-in suppression diode, external series resistor
auxiliary contacts	Built-in 1 NC
Terminal type	Spring terminals
Application type	Traction Contactor
Product Family	SIRIUS 3RT2 Mini Contactor

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