The shell material of the external circuit breaker of the energy meter usually needs to have good durability, electrical insulation performance and corrosion resistance to ensure that the circuit breaker is safe and reliable in complex working environments.

Common materials for external circuit breakers of energy meters:

1. Shell material
Plastic (engineering plastic): Commonly used plastics include polycarbonate (PC), polyamide (PA), polypropylene (PP), etc. These plastics have good insulation, impact resistance and high temperature resistance, and can effectively protect internal electronic components.
Flame retardant plastic: In order to improve fire resistance, the shell usually uses plastic with added flame retardants to ensure that it will not burn easily under high temperature or arc fault conditions.

2. Insulating material
Ceramic: In high voltage applications, ceramic insulating materials may be used in certain key parts of the circuit breaker, with excellent insulation and heat resistance.
Epoxy resin: As a solid insulating material, epoxy resin is often used to seal electrical components, with good moisture resistance, dust resistance and insulation performance.

The selection of these materials needs to comprehensively consider the use environment, functional requirements and cost of the external circuit breaker of the energy meter to ensure its safety, durability and reliability.