C800 – 1-pole bi-directional DC contactors up to 500 amps for automotive applications

Compact DC contactors for e-mobility up to 1,500 volts rated insulation voltage. Making current up to 4,500 amps, continuous currents up to 500 amps, short-time currents up to 6,000 amps.

C800 1-pole bi-directional DC NO contactors
Ue up to 1.000 volts; Ith up to 500 amps; Design for external PWM control

Schaltbau’s new compact bi-directional DC contactors C800 series for auto­motive applications in the modern mobility industry. They switch high power in a small space and have a making capacity of up to 4,500 amps. The contactors permanently carry up to 500 amps; in the event of a short circuit, even 6,000 amps may flow for 20 milliseconds without the contacts welding. Thus, the contactor retains its full function to switch large powers when required, for example up to 1,200 amps and 450 volts – regardless of the direction of the current.

This makes C800 series contactors ideal for use in the Battery Disconnect Unit (BDU) of modern e-vehicles. The BDU connects the high-performance battery with the electrical components of the drive train. And it performs an important safety function: in the event of danger, it disconnects the high-voltage battery from the high-voltage grid. In the event of thermal overload or a short circuit, the electrical drive train is thus reliably galvanically isolated from the battery.


Compact dimensions – High rated insulation voltage Ui up to 1,000 volts

Small dimensions – great performance! Nevertheless, all the air gaps in the contact area have been generously dimensioned. The rated insulation voltage is 1,000 volts.
The arc chamber of the C800 is made of plastic. This is efficient and saves weight.

High continuous thermal current Ith up to 500 amps

All versions of the C800 can carry up to 500 A continuously. The short-time current carrying capacity Icw is a maximum of 6,000 amperes for 20 milliseconds.

Making capacity Icm up to 4,500 amps

The C800 can switch on a current of up to 4,500 amps. High contact forces and burn-off resistant silver contacts favour the excellent breaking capacity.

Full bidirectionality – reliable disconnection of high performances

All versions of the C800 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 C800 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.


E-mobility automotive:

The compact switching device can be integrated especially in areas where there is no space for larger series. Since the C800 series can reliably switch in both directions of current, it is ideally suited for applications with energy recovery. In battery-powered and hybrid vehicles, the units can be used as main contactors directly in the Battery Disconnect Unit (BDU). Here, C800 series contactors reliably ensure the galvanic isolation of both poles of the battery from the vehicle’s powertrain in the event of a fault.


Type of voltageDC bi-directional
Main contacts, configuration1 NO
Rated operating voltage Ue1,000 V
Rated insulation voltage Ui1,000 V
Rated impulse withstand voltage Uimp2.5 kV
Pollution degreePD3
Conv. thermal current Ith500 A @ 8 h
Cross-section 185 mm2
Terminal temperature max. 185° C
Ambient temperature max. 80° C
Rated short-time withstand current Icw6,000 A @ t = 20  ms
< 25,000 A @ t < 20  ms (contact welding, no explosion, no fire)
Rated short-circuit making capacity Icm4,500 A @ L < 50 µH
Aux. contact1 NC (Ui = 24 V, Ith = 2 A)
Control voltage Us 12 V DC, Operating range 8.5 ... 16 V DC
24 V DC, Operating range 16 ... 32 V DC
PWM control: external
Coil suppression: external
VibrationLV 124, M04: Profile D
ISO 16750-3: Profile IV
ShockLV 124, M05: 50g
ISO 16750-3: 6 ms
(Temporary contact closing @ > 20 g / 6 ms)
Mounting orientationhorizontal, vertical
Temperature range–40° C ... +95° C
Mechanical endurance200,000 operations
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Related Downloads

Flyer C800
Contactors C800 – 1-pole bi-directional DC NO contactors up to 500 amps for automotive applications
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