The Crabtree RCCB Split-Load 63amp B4069 Circuit Breaker Type B is a fixed RCD with a DIN rail mounting style and a maximum amperage of 63. It offers overcurrent protection and is suitable for interior use in any room. This Type B circuit breaker has an IP20 rating and operates with an on/off control style, making it ideal for electrical wiring applications. With its weather-resistant features and instant tripping characteristics, this Crabtree circuit breaker provides reliable protection in AC current situations.