Circuit breaker

Circuit breaker 15A plastic

NOTES: Plastic vs Metal

Vibration: Plastic housings with mounting brackets are one-piece molded designs and are less prone to vibration.
Metal housing with brackets are two-piece designs. The bracket is attached by spot welding and can be loosened by vibration.

Shorting Out: If a wire should loosen from a terminal on a plastic housing version, it will not short out against the housing as it may do with a metal housing 

Weight: The plastic housing is also lighter than the metal housing.