Differential Relays ELR21-31 / TYPE B
REPLACED BY THE NEW MODELS ELRv21-31 SFERE | ELRv21-31 !!!
The differential relays ELR21-31 are designed for limitation of the earth leakage current of the type B.
Associated with a measure earth leakage transformer and circuit breaker they allow to perform on low voltage networks of the type TT, IT, TNS the following functions:
- Protection from direct contacts
- Complementary protection from indirect contacts
- Limitation of the leak current
- Protection from fires
Their reinforced immunity and TRMS measurement technique guarantee maximum safety and continuity of the electrical operation, avoiding ill-time cuts.
TECHNICAL SPECIFICATIONS
- Permanent display of the instant leak current
- Display of the latching current
- Programmable sensitiveness: 30 mA to 3 A
- 2 alarm and pre-alarm relay outputs
- Re-triggering cycle programmable (ELR30 Model)
- Test and reset the alarms from the keyboard or via external command
- Test of the connection with the earth leakage transformer
- Galvanic isolation: 2KV
- For DIN rail mounting
- Power supply: 20 to 270 vac and 20 to 300 vdc
