High Speed Circuit Breaker type IRA with Holding Coil

The IRA Series is single pole, magnetic blow out, trip free, air circuit breakers.

The breaker closing device is electromagnetic (for Substation and Industry applications) or electropneumatic (for Locomotives). The breaker is held closed by a holding coil and is equipped with a direct acting unidirectional over-current trip device.

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]
  Icc 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
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