3RT2017-2LB42

The Siemens SIRIUS 3RT2017-2LB42 is the basic code for an electromagnetic contactor for traction/coupling. It is rated at 12A, 5.5kW/400V, AC-3, with a 24V DC coil. It has one set of normally closed auxiliary contacts and spring terminals. The actual shipment is differentiated by the original manufacturer's suffix, but the core electrical specifications are the same.

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

Product Positioning

3RT2017-2LB42 is the basic ordering code for the 24V DC coil traction/coupling contactor in the Siemens SIRIUS 3RT2 series. It is AC-3 rated at 12A, 5.5kW/400V, and shares the same core electrical specifications with versions under the same code such as -0LA0 and -1LA0: 3-pole main contacts, one set of normally closed auxiliary contacts, a 24V DC coil (operating range approximately 0.7~1.25 times the rated value), spring terminals, and S00 housing dimensions. The actual model number shipped by the manufacturer will have a suffix added to indicate a specific production batch or version detail; however, the main circuit specifications and coil voltage remain consistent. When purchasing, it is recommended to confirm the complete ordering code (including the suffix) according to actual needs to ensure that the auxiliary functions match the ordered version.

Core Product Advantages and Features

24V DC coil, representative of the family's core specifications

As the basic version of the 2LB42 code, the coil voltage and main circuit specifications are consistent with the suffix derivative models (such as -0LA0, -1LA0), all of which are AC-3 12A, 5.5kW/400V.

Built-in 1 set of normally closed auxiliary contacts

It provides 1NC auxiliary contacts for interlocking or feedback signals, eliminating the need for external contact modules.

Spring terminals, S00 small frame

The main circuit adopts a spring terminal design, and the housing size is the smallest in the family, S00, making it suitable for control panels with limited space.

Differentiate detailed versions by suffix

When ordering, the actual model number will be marked with a suffix (such as -0LA0, -1LA0) to distinguish a specific production version, while the core electrical specifications remain consistent.

project	Specification
Model (MLFB)	3RT2017-2LB42 (basic code, actual shipment includes suffix)
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
auxiliary contacts	Built-in 1 NC
Terminal type	Spring terminals
Installation method	Snap-On
Reference dimensions	70 x 45 x 117~121 mm (slightly different depending on the suffix of the version)
Reference mechanical life	30 million cycles (based on original manufacturer data for version -1LA0)
Reference insulation voltage/impact withstand voltage	690V / 6kV (according to the original manufacturer's data for version -1LA0)

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