Square D S33100 Circuit Breaker Trip Unit

Product Description

The SQUARE D S33100 is a replacement trip unit designed for use with P-Frame and R-Frame circuit breakers. The trip unit is the mechanism within the breaker that senses overcurrent conditions and initiates the trip action to interrupt fault current. This component is a direct accessory replacement intended to restore proper protective function to an existing breaker assembly. Measuring 4.3 inches in length, 2.8 inches in width, and 1.3 inches in height, it is a compact unit weighing 0.06 pounds. Licensed electricians and electrical contractors performing breaker maintenance or repair work are the primary installers of this component.

This trip unit fits P-Frame and R-Frame Square D circuit breakers, making it applicable to a range of commercial and industrial panel and switchboard installations where these breaker frame sizes are deployed. It is used during field service or repair when the trip mechanism has failed or been damaged and a full breaker replacement is not desired. The unit ships individually and is sold as a single accessory component.

Key Features

• Direct replacement trip unit for P-Frame and R-Frame circuit breakers
• Compact form factor: 4.3 x 2.8 x 1.3 inches
• Lightweight at 0.06 pounds for easy handling during panel service
• Sold as a single unit for targeted component-level repair
• Restores overcurrent sensing and trip function to existing breaker frames

Compatibility

Designed for use with SQUARE D P-Frame and R-Frame circuit breakers as a replacement trip unit accessory.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). The circuit breaker and associated panel must be fully de-energized and locked out before removing or replacing any trip unit components. Verify that the replacement trip unit matches the frame designation of the existing breaker before installation. Follow the breaker manufacturer's service documentation for proper seating and reassembly procedures.