High Speed Circuit Breaker type IRA with Holding Coil
The IRA series are single pole, magnetic blow-out, trip free, air circuit breakers. The breakers is electromagnetic type. The breakers is held closed by holding coil and is equipped with a direct acting over – current trip device unidirectional.
| Technical Characteristics | |||
| Rated voltage [V] | Un | 1500 | 3000 |
| Overvoltage category | OV3 | OV3 | |
| Degree of pollution | PD3 | PD3 | |
| Rated current [A] | In | Up to 3000 | Up to 3000 |
| Short circuit breaking capacity | Ue | 1800 [V] | 3600 [V] |
| Îcc | 100 [kA]- Peak | 60 [kA]- Peak | |
| Icc | 60 [kA]- Steady State | 40 [kA]- Steady State | |
| Tripping direction | Unidirectional | Unidirectional | |
| Mechanical life (EN 50123) | N | 20.000 | 20.000 |
| Dielectric withstand voltage [50Hz, 60s] | |||
| Across open main contacts | UA | 4.5 kV | 7.5 kV |
| Between main contacts and earth | UA | 5.4 kV | 15 kV |
| Between auxiliary and earth | UA | 3 kV | 3 kV |
| Auxiliary circuit | |||
| Rated voltage [Vdc] | Un | 24 ÷ 250 | 24 ÷ 250 |
| Type of holding device [EM: Electtromagnetic] | EM | EM | |
| Auxiliary contacts | |||
| Available contacts | 4 NO+ 4 NC | 4 NO+ 4 NC | |
| Max breaking capacity on Ohmic load [A] | In | 4 | 4 |
| Ambient conditions | |||
| Temperature | Tamb | -5 + 40° C | 5 + 40° C |
| Altitude | h | < 1400 m | < 1400 m |
| Installation | |||
| Mounting position | Vertical | Vertical | |
| Fixing | Bolted on the base | Bolted on the base | |
| Connection of main circuit | Cables or busbars | Cables or busbars | |
| Weight (1500 A version) | kg | 178 | 225 |
| Dimensions (1500 A version) | mm | 801x302x1133h | 801x302x1070h |
| Execution [F= Fixed; W= Withdrawable] | F | F |
