Field Failure Relay (FFR)
For D.C. Drives and Instrumentation
- The Field Failure Relay, when used in series with the field circuit, ensures that no power is supplied to the Armature unless Field circuit is complete.
- Field Failure Relay, also known as Field Loss Relay protects the D.C. Shunt motor or main circuit under open field conditions.
| Current | Pick-up | Drop-out | Size | Outline |
|---|---|---|---|---|
| Ranges | Current | current | (mm) | |
| (A) | (+5%) | (<) | ||
| 0.1 to 0.5 | 80mA | 50mA | 95 X 35 | IR-40 |
| 0.2 to 0.7 | 180mA | 100mA | 95 X 35 | IR-40 |
| 0.7 to 1 | 600mA | 350mA | 95 X 35 | IR-40 |
| 1.0 to 2.0 | 850mA | 500mA | 95 X 35 | IR-40 |
| 2.0 to 4.0 | 1.8A | 1.0 A | 95 X 35 | IR-40 |
| 4.0 to 6.0 | 3.6A | 2.0 A | 95 X 35 | IR-40 |
| 6.0 to 10 | 5.0A | 2.5 A | 95 X 35 | IR-40 |
