The Type 81 frequency relay is a reliable solid state relay designed to provide accurate detection of abnormal frequency conditions on electrical power systems
The Type 81 frequency relay is a reliable solid state relay designed to provide accurate detection of abnormal frequency conditions on electrical power systems. The Type 81 is available in one- and two-stage models. Single-step models are provided with means to select either underfrequency or overfrequency operation. Two-stage models may be set up for either two steps of underfrequency detection, two steps of overfrequency operation, or for overfrequency and underfrequency protection.
Why ABB?
- Long product life
- Ease of application
- Reliable protection
- High-quality design