Leviton Telcom 330MI7WLEV 30A Mechanical Interlock

Product Description

The LEVITON TELCOM 330MI7WLEV is a 30-amp mechanical interlock designed to prevent two circuit breakers or switches from being engaged simultaneously. Mechanical interlocks are a critical safety component in electrical panels and transfer switch applications, ensuring that a utility feed and a generator feed cannot be active at the same time. Licensed electricians install this device to meet code requirements for safe manual transfer of power sources. The unit ships as a single assembly and is suited for use in both residential and light commercial electrical installations.

This mechanical interlock is applicable in generator transfer scenarios where a manual interlock is required in lieu of a dedicated transfer switch. It mounts directly to compatible breaker panels, providing a physical barrier mechanism that enforces correct switching sequence. Electricians working on standby generator hookups, load center upgrades, or temporary power configurations will encounter this type of interlock as a code-compliant solution for preventing back-feed hazards.

Key Features

• 30-amp rated mechanical interlock for dual-breaker applications
• Prevents simultaneous engagement of two breakers for back-feed protection
• Single-unit assembly — no additional components required for basic installation
• Hardware accessory classification suitable for load center and panel applications

Compatibility

Designed as an OEM-style replacement mechanical interlock for compatible Leviton load centers and breaker panels rated at 30 amps. No specific panel model compatibility was provided in the product data.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local amendments. De-energize the panel and verify absence of voltage before beginning installation. The interlock must be mounted per the manufacturer's instructions to ensure the physical lockout mechanism functions correctly. Do not modify or bypass the interlock hardware, as doing so defeats the safety purpose of the device.