3RT20172XF420LA2

The Siemens SIRIUS 3RT2017-2XF42-0LA2 is an electromagnetic contactor for track traction/coupling. It is rated at 12A, 5.5kW/400V AC-3. The coil covers a wide voltage range of DC72 to 125V and has built-in surge suppression. It is equipped with spring terminals and one set of normally closed auxiliary contacts, making it suitable for applications with large voltage fluctuations.

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Siemens 3RT2017-2XF42-0LA2 Traction Contactor AC-3 12A 5.5kW DC72-125V

Product Positioning

The 3RT2017 is the smallest S00 frame model in the Siemens SIRIUS 3RT2 mini contactor family. With an AC-3 rating of only 5.5kW/400V, 12A, it is more compact than the 3RT2018 and is commonly found in rail vehicles, battery-powered equipment, or coupling control circuits. The 3RT2017-2XF42-0LA2 is the wide-range electronic DC coil version in this series. The coil can accept input voltage fluctuations from DC 72 to 125V (corresponding to 0.7 to 1.25 times the rated value). It features a built-in surge suppression varistor and one set of normally closed auxiliary contacts. Both the main circuit and control circuit use spring terminals, which can withstand higher vibrations without easily loosening, making it suitable for applications with stringent power stability requirements, such as traction and coupling.

Core Product Advantages and Features

Wide-range DC72-125V electronic coil

The coil can operate stably within a voltage range of 0.7 to 1.25 times the rated voltage, and can absorb voltage fluctuations from battery discharge or rectified power supply, reducing the risk of malfunction.

Built-in varistor surge suppression

The coil circuit integrates a varistor surge absorption element to reduce electrical interference to the control circuit during switching.

Spring terminals, vibration-resistant design

Both the main circuit and the auxiliary circuit use spring-type terminals, and the conductor cross-section can reach 2x (0.5~4mm²), which is suitable for mobile equipment with large vibrations.

1 set of normally closed auxiliary contacts

Built-in 1NC instantaneous action auxiliary contact, AC-12 maximum current 10A, can be used for interlocking or status feedback circuits.

project	Specification
Model (MLFB)	3RT2017-2XF42-0LA2
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 range	DC 72~125V (0.7~1.25 times rated value)
Surge suppression	Built-in varistor
auxiliary contacts	Built-in 1 NC (instantaneous action)
Auxiliary contact AC-12 rated current	10 A
Terminal type	Spring terminal (main circuit/control loop)
conductor cross-section	2x(0.5~4mm²)
External dimensions (height x width x depth)	70 x 45 x 73 mm
Mechanical life	Approximately 30 million cycles (approximately 10 million cycles with auxiliary contact module added)
Insulation voltage / impulse withstand voltage	690V / 6kV

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