Electrical relays . part 3 : single input energizing quantity measuring relays with dependent or independent time 电气继电器第3部分:它定时限或自定时限的单输入激励量量度继电器
2.
Electrical relays . single input energizing quantity measuring relays with non - specified time or with independent specified time 电气继电器.无规定时限或自定时限的单输入激励数值测量继电器