reversed current relay meaning in English

反流继电器
逆流继电器

13 amperes 4 - pole sealed reverse current relays
3a小型密封四极逆流继电器
Electrical equipment for aircraft . differential reverse current relays with feeder protection
飞机电气设备.带馈线保护的差动反向电流继电器
Switchgear for aircraft . fixing of base for 3 amperes double pole sealed reverse current relays
飞机电气开关装置. a双极密封逆流双极继电器座的安装