This standard specifies the terms and definitions, symbols, codes, basic requirements, circuit breaker classification and characteristics, product information, normal operation, installation and transportation conditions, technical requirements, testing, and quality of plastic case circuit breakers (hereinafter referred to as circuit breakers). Commitments, etc. This standard is applicable to main contacts used to connect circuit breakers with a rated voltage not exceeding AC 1000V (for circuit breakers with AC 1140V, please refer to this standard).