Siemens 3RT2017-2LF42-0LA0 SIRIUS Traction Contactor 12A, 5.5kW, 110V DC Coil, Spring Terminal, Size S00 Original Brand New

Overview: Siemens 3RT2017-2LF42-0LA0 Traction Contactor

The Siemens 3RT2017-2LF42-0LA0 is a specialized, high-reliability traction contactor from the SIRIUS 3RT2 series, engineered for demanding applications, particularly in railway and heavy-duty DC environments. This 3-pole contactor is rated for $12\text{ A}$ (AC-3e/AC-3) and $5.5\text{ kW}$ at $400\text{ V}$.

It features a robust $110\text{ V DC}$ operating coil designed with an extended operating range of 0.7–1.25×Uc​ and includes an integrated varistor for superior surge protection. Its compact size S00 frame and vibration-resistant spring-loaded terminals ensure reliable performance and fast, secure wiring in mobile or high-vibration installations.

Benefit

By choosing the Siemens 3RT2017-2LF42-0LA0, you gain the following critical benefits:

• Unmatched Reliability in Harsh Environments: Designed specifically as a Traction Contactor, it meets the stringent standards for mechanical oscillations, vibrations, and extended temperature ranges $\left(\text{–}40\text{ to }+70\text{ °C}\right)$, making it perfect for rail, offshore, and heavy industry.
• Enhanced Coil Protection: The integrated varistor provides robust overvoltage damping, protecting the $110\text{ V DC}$ coil and prolonging the contactor’s lifespan.
• Vibration-Proof Wiring: Spring-loaded terminals ensure a permanent, gas-tight connection that is highly resistant to vibration, drastically reducing maintenance and downtime compared to screw terminals.
• Space and Cost Efficiency: The compact Size S00 design with a narrow frame saves valuable space in control cabinets and panels.
• Simple Integration: Part of the modular SIRIUS 3RT2 system, it allows for easy combination with other SIRIUS components like overload relays and auxiliary switches.

Function and Application

The 3RT2017-2LF42-0LA0 acts as a reliable switch for electrical loads. Its primary function is to safely start, stop, and control $3\text{-phase}$ AC motors $\left(\text{AC-3e/AC-3 duty}\right)$.

Typical Applications:

• Railway Technology: Switching motors, heating, lighting, and other critical loads in train, tram, and subway systems.
• Mobile Machinery: Control in cranes, construction equipment, and vehicles where high vibration and DC coil voltage are present.
• Industrial DC Control: Any application requiring reliable switching with a $110\text{ V DC}$ control voltage, extended operating conditions, and increased mechanical robustness.

Installation and Connection

Installation is simplified by the spring-loaded terminal system, which allows for fast, tool-free wiring of the control and auxiliary circuits. The unit supports both screw mounting and Snap-On mounting onto a standard DIN rail. The plugged-on series resistor is included to ensure optimal performance with the $110\text{ V DC}$ coil across the wide voltage range.

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