Square D S29354 Circuit Breaker Mechanical Interlock

Product Description

The SQUARE D S29354 is a mechanical interlock accessory designed for use with PowerPact circuit breakers. Mechanical interlocks prevent two breakers from being closed simultaneously, a critical function in transfer switch applications, reversing motor starters, and other systems where simultaneous energization of two circuits would create a hazard or equipment conflict. This accessory is installed by licensed electricians during panel or motor control center assembly or service. It measures 6 inches in length, 9 inches in width, and 1 inch in height, and weighs 0.68 pounds.

This interlock is intended for use with SQUARE D PowerPact circuit breakers in commercial and industrial electrical systems. Typical applications include automatic and manual transfer switch configurations, reversing contactors, and dual-source feed arrangements where a physical lockout between two breaker positions is required by code or system design. Always verify breaker frame compatibility before installation.

Key Features

• Mechanical interlock prevents simultaneous closure of two circuit breakers
• Designed specifically for use with PowerPact circuit breakers
• Compact form factor: 6 x 9 x 1 inches
• Lightweight at 0.68 pounds for easy handling during panel work
• OEM accessory ensuring proper fit and reliable operation

Compatibility

Designed for use with SQUARE D PowerPact circuit breakers as stated by the manufacturer.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and any applicable local codes. De-energize and lock out the panel or motor control center before installing or servicing this interlock. Follow the manufacturer's instruction sheet for proper mounting orientation and breaker alignment. Do not modify the interlock mechanism or attempt to force breaker handles beyond their designed range of travel.