Jack-Elec-Forum
- Jan 4, 2021
- 2
- Joined
- Jan 4, 2021
- Messages
- 2
Anyone using ABB Circuit Shield under voltage relay? We have many of them and lately 2 of them mis-operated causing significant lost to our manufacturing process. Relay contact operated like if we had a power loss but no where in the distribution system our power quality meters detected such under voltage conditions. The relays are about 10 years old and the manual does NOT recommend any maintenance. Environment is temperature controlled.