3RT2018-2XF41-0LA2

S00 frame contactor for rail transit, 72-125V DC wide-range electronic coil with built-in surge suppression, spring terminal 1NO auxiliary contacts, main contact rated current 20A, AC-3 operating current 16A/7.5kW, operating temperature -40~70°C

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Siemens 3RT2018-2XF41-0LA2 Traction Contactor 72-125V DC Wide Range Coil AC-3 16A/7.5kW

Product Positioning

The 3RT2018-2XF41-0LA2 is an S00 miniature contactor in the SIRIUS 3RT20 series, specifically designed for rail transit (traction) applications. Its biggest difference from general industrial contactors lies in its coil: it uses a wide voltage range electronic coil of 72 to 125V DC and has a built-in surge suppression circuit, directly compatible with various DC voltage levels commonly found in the control power supplies of rail vehicles worldwide, reducing selection and spare parts costs. The main circuit maintains the 3RT2018 family's consistent AC-3 16A/7.5kW (400V) rated capacity. The manufacturer also indicates a 20A rated current. It features one set of normally open auxiliary contacts for signal feedback, and spring-loaded terminals facilitate stable wiring in high-vibration environments. The operating temperature range is extended to -40°C to 70°C to withstand harsh outdoor or in-vehicle environments.

Core Product Advantages and Features

Wide-range electronic coil

The coils can cover a wide voltage range of 72-125V DC, and a single part number can correspond to various DC control power supplies for rail vehicles, simplifying selection and inventory management.

Built-in surge suppression

The coil circuit incorporates a surge suppression element to reduce voltage spike interference to other components of the control system during coil switching.

Weather resistance temperature design

Operating temperature range is -40°C to 70°C, which is wider than that of general industrial contactors, making it suitable for outdoor cabinets or vehicle compartments with varying temperature conditions.

Spring-loaded terminal wiring

Both the main circuit and auxiliary circuit use spring-loaded terminals, allowing for quick and secure wiring without the need for screws, and providing excellent resistance to vibration and loosening.

project	Specification
Product Series	SIRIUS 3RT20, frame size S00
Extreme number	3 poles (3 normally open main contacts)
Application type	Rail transit/traction special contactor
AC-3 Rated Current/Power (400V)	16 A / 7.5 kW
Rated current (In)	20 A
Coil Specifications	72-125V DC wide-range electronic coil with built-in surge suppression
auxiliary contacts	1 normally open (1NO) group
Terminal type	Spring-loaded terminals (main circuit/auxiliary/coil)
External dimensions (height × width × depth)	Approximately 70 × 45 × 73 mm
Operating temperature range	-40°C ~ +70°C
Mechanical life	Approximately 30 million times
Insulation voltage	690 V (Pollution Level 3)
Protection level	IP20 (Front Panel)
Installation method	35 mm DIN rail

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