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What is the Difference Between P and S Prefixes of Shunt Trips / Undervoltage Trips for H, J and L-Frame Circuit Breakers?
Issue: Differentiating the two types of shunt trips / undervoltage trips used in H, J, and L-frame breakers

Product Line: H, J and L Frame Molded Case Circuit Breakers

Resolution:

The difference between these products is their termination method.

The accessory with the prefix 'S' is the classic version that has a screw connection for installation. The other accessory with the prefix 'P', which is the latest model, has a spring clamp connection that makes the installation easier.

For installation procedure, please check this document .

Schneider Electric USA

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