Leviton Telcom 420MI12W Mechanical Interlock Enclosure

Product Description

The LEVITON TELCOM 420MI12W is a mechanical interlock enclosure designed for 3-pole, 4-wire electrical configurations. Mechanical interlock enclosures prevent two power sources from being connected simultaneously, protecting equipment and personnel from back-feed hazards. This unit is sold individually and is suited for installation by licensed electricians working on transfer switch assemblies, generator connection points, or similar power-switching applications where physical interlock control is required by code or design specification.

The 420MI12W is appropriate for commercial and industrial electrical installations where a mechanical interlock is needed to enforce safe switching between two power sources. Typical applications include generator interlock systems and manual transfer arrangements in panel or enclosure assemblies. It is intended for use by qualified electricians familiar with NEC requirements governing transfer equipment and overcurrent protection.

Key Features

• 3-pole, 4-wire mechanical interlock configuration for multi-phase applications
• Prevents simultaneous engagement of two power sources, reducing back-feed risk
• Sold as a single unit for straightforward procurement and replacement
• Hardware accessory classification suitable for panel and enclosure integration

Compatibility

Designed as an OEM-style mechanical interlock enclosure accessory for 3-pole, 4-wire electrical switching assemblies. No specific compatible model numbers were provided in the available product data.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements. De-energize all circuits at the main disconnect before beginning installation or service on the interlock enclosure. Verify that all conductors are properly rated for the intended load and that the interlock mechanism operates freely before restoring power. Do not bypass or modify the interlock mechanism, as doing so defeats its safety function.