What is ANSI 50LR ? What is the difference between ANSI 50LR and ANSI 51LR? Can Easergy P3 (Motor application) carry out Locked Rotor protection function?

Search FAQs

Issue:
Meaning of ANSI 50LR

Product Line:
Easergy P3 protection function

Resolution:

- In protection, ANSI code 50 refers to instantaneous operation which means that the action should be carried out as fast as possible with no delay. Meanwhile ANSI code 51 refers to time delayed operation.
- ANSI 50LR is simply an instantaneous overcurrent protection stage that is blocked during motor start.
- Locked rotor protection function in Easergy P3 protection relays (P3U10/20/30, P3M30, P3M32) is achieved by ANSI code 51LR with minimum time delay of 1 sec.