CU – Double pole DC power contactors for power supply and UPS systems

Double-pole NO contactor for DC (unidirectional). Rated insulation voltage 3,000 V; conventional thermal current 1000 A.

CU1215/04 Double pole contactor for DC (unidirectional)

With the double-pole contactors of the CU range, Schaltbau expands its array of new and innovative switchgear in the power category up to 1000 A. The switchgear ensure low-wear and reliable switching of high loads. The double coil drive reduces the power consumption in holding operation.

Power contactors of the CU range are suitable for use in photovoltaic systems (in the DC circuit of central inverters) as well as in power supply and battery systems, such as for UPS systems.


Compact power contactor based on the CT range

The CU series has a compact design with geometrically optimised electric arc chambers. Design and components are based on the power contactors of the CT series.

Double coil drive

The double coil drive effectively reduces the power consumption in continuous operation.

Up to 4 auxiliary contacts: Snap-action switch with positive opening

The switch state of the main contacts is indicated through snap-action switches with positive opening operation: alternatively, through various combinations of the series S870 and S826.

Main contactor in the DC circuit of solar power systems

If required, the CU contactor disconnects the central inverter from the solar fields. The CU complies with the standards EN 60947-3 and UL 60947-4-1.

Use in power supply and battery systems
  • Photovoltaic systems (in the DC circuit of the central inverter)
  • Battery storage for the power supply
  • UPS systems
Ambient temperatures: –40°C to +70°C

Since the basic technology of the CU series was developed for the rail technology, the contactor can be used in extreme temperatures.


Series CU
Type of voltageDC (unidirectional)
Main contacts, configuration2 x NO
Nominal voltage Un1,500 V
Rated operating voltage Ue1,800 V
Rated insulation voltage Ui3 kV
Rated impulse withstand voltage Uimp15 kV
Conv. thermal current Ith1000 A
Rated short-time withstand current Icwe.g. 2 x 450 A fuse (type gPV) connected in parallel
Rated short-circuit breaking capacity (2 poles in series)DC21
Conditional short-curcuit currente.g. 2 x 450 A fuse (type gPV) connected in parallel
Contact material main contactsAgSnO2
Aux. contact4 x SPDT
Coil voltage Us24, 36, 72, 110 V DC
Coil tolerance-10% ... +10%
Coil power consumptionPull-in coil approx. 150 W, holding coil approx. 10 W
IP rating (IEC 60529)IP00
Mechanical endurance2 million operating cycles
Electrical endurance> 25,000 operating cycles
Mounting orientationhorizontal/vertical
Temperature range-40 °C ... +70 °C
Storage temperature-40 °C ... +85 °C
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Related Downloads

Flyer C22
CU1215/06 - Double pole DC power contactors for central inverters
Safety instructions contactors
AFS / C100 / C110B / C130 / C137 / C152...C159 / C160 / C162 / C163 / C164 / C165 / C193 / C195 / C294 / C295 / C160 / C3xx / C8xx / C400 / C600 / CA / CF / CH / CL / CP / CPP / CS / CT / CU / S100/80 / S132 / S134 / S135 / S005 / S007 / S008 / S306 / S307 / S310
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