CA – Power contactors for AC applications

Single and triple pole AC contactors (NO). Rated insulation voltage up to 4,800 V, conventional thermal currentup to 800 A, frequency up to 400 hertz.

Triple pole AC NO contactor. Ui = 2000 V, Ith = 540 A, frequency up to 400 Hz.

With the power contactors of the CA range, Schaltbau presents a new switchgear concept for the reliable shutdown of converters.

In photovoltaic systems, the CA disconnects the central inverter securely from the grid and then reconnects it to the grid, if so required. However, the AC contactor can switch considerably higher frequencies than the 50 to 60 hertz typical in industry: e.g. up to 400 hertz in the drive system of multiple units. Here, a short circuit in the output circuit of the converter can block the permanent-magnetic drive (PM motors work as generators). In such cases, the CA contactor disconnects the converter reliably from the drive.


Frequencies up to 400 hertz; high short circuit switching capacity

The CA can switch considerably higher frequencies than the 50 to 60 hertz typical in industry. The triple pole AC contactor possesses a high short circuit switching capacity for frequencies up to 400 hertz.

Tried and tested in railway technology, reliable in all AC applications

The CA works in a wide range of AC applications. For example, it connects the central inverter of a photovoltaic system with the grid or works as a traction contactor in electrical multiple units. The CA complies with the following railway standards:

  • EN 60077-1 and EN 60077-2
  • EN 61373
  • EN 50124-1
  • EN 50125-1
Insulation coordination
  • Function insulation of the main electric circuits from one another
  • Basic insulation between main electric circuits and earth (phase to earth in each case)
  • Reinforced insulation between main and control electric circuits
Auxiliary contacts with snap-action switches

Snap-action switches can report the switch state of the main contacts to the higher-level control system. Different versions are possible, achieved with the switches S870, S970 or S826.

Supporting maintenance
  • Simple visual inspection and replacement of the main contact pieces
  • Simple replacement of the arcing chambers
Ambient temperature: –40°C up to +70°C

Based on its approval for rail applications (EN 60077-1, EN 60077-2), the contactor also works in extreme temperatures.


3 pole: CA1315/04, CA1330/08 1 pole: CA1115/04, CA1130/08
Type of voltageAC (f < 400 Hz)
Main contacts, configuration3 x NO
Nominal voltage Un1,500 V / 3,000 V
Rated operating voltage Ue1,800 V / 3,600 V
Rated insulation voltage Ui2,000 V / 4,800 V
Rated impulse withstand voltage Uimp15 kV / 25 kV
Conv. thermal current Ith350, 540 A / 800 A
Rated short-time withstand current Icwupon request
Short-circuit breaking capacityOptimized for switching off 400 Hz max.
Rated short-time withstand current IcwOptimized for switching off 400 Hz max.
Contact material main contactsAgSnO2
Aux. contact1x  S870 (a1), 1x  S870 (b0), 2x  S826 or 
4x  S826 or
2x  S970 (a1), 2x  S970 (b0) or
1x  S970 (a1), 1x  S970 (b0)
Coil voltage Us24, 36, 48, 72, 110 V
Coil tolerance-30% ... +25% Us
Coil power consumption100 W/75 W and 280 W/27 W resp. cold/warm
IP rating (IEC 60529)IP00
Mechanical endurance> 500.000 operating cycles
Vibration / Shock (IEC 61373)Category 1, Class B
Mounting orientationany
Temperature range-40 °C ... +70 °C
Storage temperature-40 °C ... +85 °C
Weight20,000 / 25,000
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CA – power contactors for AC applications