Breaker Abbreviations and Acronyms

1. SOR
   Shunt Opening Release
2. ST
   Shunt Trih
3. TB
   Thomas and Betto
4. TC
   Trip Coil
5. TT
   Trip Tesu
6. UL
   Underwritten Laboratories
7. URC
   Utility Relay Company
8. ZSI
   Zone Selective Interlocking
9. R.R.R.V.
   Rate of Rise of Restriking Voltage

Last updated: January 4, 2020 — Total entries: 49