In the layer of air distribution box additional undervoltage tripdevice, Air-conditioning load after excision of the need to manually reset by the property management sector;
在层空分配电箱增设欠压脱扣安装，空调负荷切除后需由物业管理部分手动复位；
2
This ensures that the only protective device to trip is the one nearest to the fault.
还可以确保惟一跳闸的保护装置就是离故障点最近的装置。
3
The protective relay is a sensing device, which senses the fault, determines its location and then send command to the proper circuit breaker by closing its trip coil.