LSiS AR-180 Mechanical Interlock for MC-185a to MC-400a Contactors

The LSiS AR-180 mechanical interlock is a precision-engineered accessory designed specifically for LSiS MC-185a through MC-400a series contactors. This device serves as a critical safety component in industrial electrical systems, providing a robust physical barrier that prevents two contactors from closing simultaneously. By ensuring that only one contactor can be engaged at any given time, the AR-180 effectively eliminates the risk of short circuits during motor reversing or power changeover operations.

Advantages

The primary benefit of the LSiS AR-180 is the enhanced operational safety it brings to complex control circuits. Its mechanical design is highly reliable, offering a fail-safe solution that does not depend on electrical signals or software logic. The installation process is straightforward, allowing for seamless integration with compatible contactor models. By preventing phase-to-phase faults, this interlock significantly extends the lifespan of your electrical equipment and protects the overall integrity of the control panel.

Suitable for

• Motor reversing applications
• Automatic transfer switch (ATS) changeover systems
• Industrial automation control panels
• Power distribution systems requiring interlocking logic

When it may not be suitable

This mechanical interlock is exclusively designed for the LSiS MC-185a to MC-400a contactor range. It is not compatible with contactors from other manufacturers or different series within the LSiS product line. Furthermore, it is intended for mechanical interlocking only and does not provide electrical interlocking functions on its own.

Key specifications

• Compatibility: LSiS MC-185a, MC-225a, MC-265a, MC-330a, and MC-400a contactors
• Function: Mechanical interlocking for two contactors
• Application: Reversing and changeover circuits
• Construction: Durable industrial-grade materials

How to use

To install the AR-180, ensure that the power supply to the contactors is completely disconnected. Mount the interlock unit between the two contactors according to the provided mechanical alignment points. Ensure that the linkage is securely fastened and that the mechanical movement is smooth and unobstructed. Before applying power, manually test the interlock by attempting to engage both contactors simultaneously to verify that the mechanism prevents both from closing at once.

What to consider before purchase

• Verify your contactor model number matches the supported range
• Ensure there is sufficient physical space on the DIN rail or mounting plate
• Confirm that your application requires mechanical rather than purely electrical interlocking

Usage recommendations

Regularly inspect the mechanical linkage for signs of wear or debris accumulation to ensure continued reliable operation. Always perform a manual test after any maintenance or adjustment to the contactor assembly.