C300 – Single-pole bi-directional DC contactors up to 1,500 volts

Super compact NO contactors for bidirectional DC up to 1,500 volts rated insulation voltage. Making current up to 2,500 amps; conventional thermal current up to 500 amps; short-time current up to 5,000 amps.

Ui up to 1,500 volts

Ith up to 500 amps

Version with integreated PWM module
Ui up to 1,500 volts

Ith up to 500 amps

Version without PWM module

The bi-directional DC contactors switch high powers in a small space. With a making capacity of up to 2,500 amps, the compact switchgear is suitable for applications with high inrush current or high capacities.

All versions can carry up to 500 amps continuously. In the event of a short circuit, 5,000 amps, can even flow for 20 milliseconds without the contacts welding. The contactor therefore maintains its full function in order to disconnect high power ranges if necessary up to 500 amps and up to 1,500 volts – irrespective of the current direction. This full bi-directionality is important for systems with a charging and discharging process, such as in battery networks or electric vehicles.

Typical applications are the DC circuit in inverters, e.g. in photovoltaic applications, battery storage and chargers.


Super-compact dimensions – high rated insulation voltage Ui up to 1,500 volts

Smallest dimensions – great performance! Nevertheless, all the air gaps in the contact area have been generously dimensioned. The rated insulation voltage is 1,500 volts. The arc chamber of the C300 is made of plastic. This is efficient and saves weight.

High conventional thermal current Ith up to 500 amps

All versions of the C300 can permanently carry up to 500 amps – provided a sufficiently dimensioned connection cross-section of 120 mm². The maximum ambient temperature for industrial applications is 85 °C. These excellent values are achieved through very high contact forces.

Making capacity Icm up to 2,500 amps

The C300 can switch on a current of up to 2,500 amps.
High contact forces and burn-off resistant silver contacts favour the excellent breaking capacity.
An integrated PWM controller regulates the coil current for all operating states, ensures low-bounce switching on and optimises the holding power.

Short-time current-carrying capacity Icw up to 5,000 amps

For 20 milliseconds, the C300 can carry a current of up to 5,000 amps without the contacts welding. The short-time current carrying capacity is supported by high contact forces and an optimised contact geometry.

Full bidirectionality – reliable disconnection of high performances

All versions of the C300 can reliably separate high currents and voltages when required, regardless of the direction of the current. These properties are achieved by the special arrangement of blowout magnets and arc chamber, burn-off resistant silver contacts, high contact forces and generously dimensioned air gaps in the contact area.

Auxiliary switch with mirror contact function

The C300 contactors have an integrated auxiliary contact with mirror contact function according to IEC 60947-4-1, annex F.
Mirror contacts are required in feedback circuits of safety controls. The mirror contact function informs about the switching state and ensures that the NC contact of the auxiliary contact is not closed at the same time as the NO main contact.


  • Main contactor in electric vehicles, vehicles with hybrid drives and electric buses, special variants for automotive applications on request
  • DC fast charging stations
  • Battery test benches for the automotive industry
Stationary energy storages
  • Grid stabilization and battery energy storage
  • Regenerative systems in industrial plants
  • Battery management systems
  • Home energy storages

Technische Daten

Type of voltageDC bi-directional
Main contacts, configuration1 NO
Rated operating voltage Ue1,000 V @ PD3
1,500 V @ PD2
Rated insulation voltage Ui1,000 V @ PD3
1,500 V @ PD2
Rated impulse withstand voltage Uimp8 kV
Pollution degree
Overvoltage category
PD2 / PD3
Conv. thermal current Ith500 A @ 8 h
600 A @ 10 min
1,200 A @ 10 sec
Rated short-time withstand current Icw5,000 A @ t = 20  ms
Auxiliary switches1 NC with mirror contact function
Coil voltage Us12 ... 24 V DC
(operating range 9 ... 36 V DC)
PWM module, integrated
Mounting orientationhorizontal, vertical
Temperature range-40° C ... +40° C
Mechanical endurance200,000 operations
Show all data

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C300 – DC bidirectional switching