Leviton Telcom 330MI7W Mechanical Interlock Enclosure

Product Description

The LEVITON TELCOM 330MI7W is a mechanical interlock enclosure rated for 2-pole, 3-wire configurations. Mechanical interlock enclosures prevent simultaneous engagement of two power sources, making them a critical safety component in electrical transfer and switching applications. This unit is sold individually and is suited for installation by licensed electricians working on commercial or residential electrical systems where source isolation is required.

The 330MI7W is used in applications where two power circuits must be interlocked to prevent back-feed or simultaneous connection. Typical install scenarios include manual transfer switch assemblies, dual-feed panel configurations, and service entrance equipment requiring physical interlock enforcement between two 2-pole breaker positions on a 3-wire system.

Key Features

• 2-pole, 3-wire mechanical interlock configuration
• Enclosure-style design protects interlock mechanism in service environments
• Sold as a single unit (each)
• Hardware accessory classification for use in electrical switching and transfer applications

Compatibility

Designed as an OEM-style replacement or add-on mechanical interlock enclosure for 2-pole, 3-wire electrical switching assemblies. No specific compatible model numbers or system families were provided in the product data.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements. De-energize and lock out all affected circuits before beginning installation or service work. Verify that the interlock mechanism moves freely and seats correctly before restoring power. Do not force the interlock mechanism, as improper engagement defeats the safety function of the assembly.