Siemens 3RT2018-2XB41-0LA2 Traction Contactor, 16A, 7.5kW, DC Control (SIRIUS 3RT2) Original Brand New

Overview: Siemens SIRIUS 3RT2018-2XB41-0LA2 Traction Contactor

The Siemens 3RT2018-2XB41-0LA2 is a high-performance Traction Contactor from the renowned SIRIUS 3RT2 series, designed for extended application ranges, particularly in environments with increased requirements such as railway applications (meeting standards like IEC 60077-2/EN 50155). This robust, 3-pole power contactor is engineered for switching motors (AC-3e/AC-3) up to $7.5\text{ kW}$ at $400\text{ V}$ and features a rated operational current of $16\text{ A}$.

It is equipped with a highly reliable solid-state operating mechanism that operates on a wide $24-34\text{ V DC}$ control voltage range (0.7−1.25×Uc​), ensuring reliable performance even with fluctuating supply. The integrated varistor provides essential overvoltage damping for the coil, enhancing the device’s lifespan and system protection.

The compact frame size S00 and secure spring-loaded terminals make installation quick and vibration-resistant, simplifying wiring and maintenance, especially in mobile or high-vibration machinery.

Benefit & Advantage

• Reliability for Demanding Applications: Specifically designed as a Traction Contactor and approved for railway applications (extended temperature range, increased vibration resistance).
• Wide Operating Range: The solid-state control mechanism handles a wide $24-34\text{ V DC}$ voltage band, ensuring stability under voltage fluctuations.
• System Protection: Integrated varistor effectively dampens switching overvoltages, protecting the control circuitry and prolonging the coil’s service life.
• Vibration Resistance: Secure spring-loaded terminals offer a reliable, maintenance-free connection, highly resistant to shock and vibration.
• Space-Saving Design: Compact Size S00 fits easily into control cabinets and modular systems.
• Extended Service Life: The solid-state actuation and integrated protective features contribute to a high mechanical and electrical service life.

Function

The Siemens 3RT2018-2XB41-0LA2 functions as a power switching device, primarily used for:

1. Motor Switching (AC-3e/AC-3): Starting and stopping $7.5\text{ kW}$ three-phase AC motors.
2. Specialized Switching (Traction/Railway): Controlling loads in vehicles and railway equipment where high resilience to ambient conditions (temperature, vibration) is required.
3. Auxiliary Signalling: The $1\text{ NO}$ auxiliary contact provides feedback on the contactor’s switching status to the control system (e.g., PLC).
4. DC Control Interface: Allows control directly from DC systems, such as PLCs or battery-backed systems, via the electronic operating mechanism.

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