👉 The term "casemate" refers to a type of structure or device that is designed for the purpose of isolating and protecting an electrical circuit from potential hazards. It is typically used in conjunction with other safety devices such as fuses, surge protectors, and circuit breakers. These devices are designed to prevent unintended electric current from reaching a specific point within the circuit, which can help to reduce the risk of fires, electrocution, or other电气事故。