3RT20172LB421LA0

The Siemens SIRIUS 3RT2017-2LB42-1LA0 is an electromagnetic contactor for traction/coupling. It is rated at 12A, 5.5kW/400V AC-3, uses a 24V DC wide-range coil, has a built-in set of normally closed auxiliary contacts, a spring terminal design, and a mechanical life of up to 30 million cycles, making it suitable for frequent operation applications.

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Siemens 3RT2017-2LB42-1LA0 Traction Contactor AC-3 12A 5.5kW 24V DC

Product Positioning

The 3RT2017-2LB42-1LA0 is a traction/coupling type contactor belonging to the Siemens SIRIUS 3RT2 minimum frame S00 series, rated at 12A, 5.5kW/400V AC-3. Unlike the DC 110V version, this unit uses a 24V DC wide-range electronic coil, capable of normal engagement within 0.7 to 1.25 times the rated voltage. The coil power consumption is only 4W (13W at startup), making it suitable for control systems powered by a 24V DC power supply. With a depth of only 117mm, its mechanical life has been measured at 30 million cycles, and its B10 life is 1 million operations. It has obtained KC and EMC certifications, making it suitable for automation and rail applications with high reliability requirements.

Core Product Advantages and Features

24V DC wide-range coil, low power consumption

The coil can operate stably within a voltage range of 0.7 to 1.25 times the rated voltage, with a continuous power consumption of only 4W and a startup power consumption of 13W, saving on the control power supply burden.

High mechanical life of 30 million cycles

The measured mechanical life reaches 30 million operations, and the B10 life value is 1 million operations, making it suitable for production line equipment with frequent switching.

1 set of normally closed auxiliary contacts

Built-in 1NC instantaneous auxiliary contact, AC-15 400V rated 3A, can be used in interlock protection circuits.

Spring terminals, compact depth 117mm

Both the main circuit and the control circuit use spring terminals, and the body depth is only 117mm, making it easy to install in narrow distribution boxes.

project	Specification
Model (MLFB)	3RT2017-2LB42-1LA0
Casing size	S00
Extreme number	3 poles
AC-3 rated current	12 A
AC-3 rated power	5.5 kW / 400V
coil voltage	24V DC (0.7~1.25 times rated value)
Coil power consumption	Continuous 4W / Start-up 13W
auxiliary contacts	Built-in 1 NC (no latency)
Auxiliary contact AC-15 rated	400V, 3A
Terminal type	Spring terminals
External dimensions (height x width x depth)	70 x 45 x 117 mm
Mechanical life	30 million times
B10 lifespan value	1 million operations
Insulation voltage / impulse withstand voltage	690V (Pollution Level 3) / 6kV
Certification	KC, EMC Declaration of Conformity

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