触发管 meaning in English

trigatron
trigger tube
trigger valve

Methods of measurement for cold - cathode trigger tubes
冷阴极触发管测试方法
General specification for cold - cathode trigger tubes
冷阴极触发管总规范
Detail specification for cold cathode trigger tube of type rq - 06
Rq - 06型冷阴极触发管详细规范
Detail specification for cold cathode trigger tube of type rq - 10
Rq - 10型冷阴极触发管详细规范