The type 51 series of overcurrent relays provide overcurrent protection phase-to-phase or phase-to-ground. They are designed to be operated by standard five ampere secondary current transformers.
51I Inverse
51Y Very Inverse
51E Extremely Inverse
51D Definite Time
51S Short Time
51L Long Time
51IM Long TIme Inverse
51YM Long Time Very Inverse
Why ABB?
- Long product life
- Ease of application
- Reliable protection
- High-quality design