C320 – AC and bidirectional DC contactors up to 1,800 V

Compact single-pole NO contactors for AC and DC (bidirectional) up to 1,800 V rated insulation voltage. Conventional thermal current up to 1,000 A; short-time current up to 5,000 A

Ui up to 1,800 V, Ith = 1,000 A.
Design with blowout magnets and arcing chamber.

The C320 is a single-pole AC and bi-directional DC contactor in the power class up to 1,000 A. It ensures that high loads are switch-off safely and provides reliable protection in the event of a fault in the system.

Typical applications are the use as main contactor in battery management systems of high-voltage vehicle batteries, in charging stations for e-mobility, in battery test benches but also in the DC circuits of inverters of photovoltaic systems.

A very efficient ceramic arc chamber, double-break contacts and high breaking capacity are important features of the new contactor.


Compact dimensions – high rated insulation voltage Ui up to 1,800 volts

166 × 170 × 89 mm are the dimensions for the width, depth and height of the C320K. All air gaps in the contact area were nevertheless generously dimensioned. The rated insulation voltage is 1,800 Volt. The C320 has an efficient ceramic arc chamber.

High making capacity Icm up to 4,000 amps and an excellent breaking capacity

The C320 can switch-on a current of up to 4,000 A. A PWM controller regulates the coil current, ensures a low bounce switch-on and a low holding power. High contact forces and optimised silver contacts favour the excellent making capacity.
The C320 can handle high short-circuit currents and can switch off a current of up to 750 A at 1,500 V, for example. This high breaking capacity is dimensioned for 60 switching operations.

High thermal continuous current Ith of up to 1,000 amps and high rated short-time withstand current Icw up to 5,000 amps

In the C320K/1000 version, the contactor can carry up to 1,000 A permanently. In addition, the series has a very high short-time current carrying capacity Icw up to a maximum of 5,000 A. These values are achieved by very high contact forces.

Full bidirectionality – safe disconnection of high power independent of the current flow direction

The K version of the C320 can reliably isolate high currents and voltages if required, regardless of the direction of the current. These properties are achieved by the special arrangement of blowout magnets and arc chamber, high contact forces and generously dimensioned air gaps in the contact area.

4 auxiliary switches with mirror contact function for diagnosis and switching status monitoring

Series C320 contactors are equipped with auxiliary contacts with mirror contact function. The mirror contact function complies with the standard DIN EN 60947-4-1 Annex F. The mirror contact function means that the NC contact of the auxiliary contact must not be closed at the same time as the NO main contact.

Low energy consumption and low heating thanks to sophisticated coil saving circuit

The pull-in behaviour is controlled by a PWM controller independent of the coil voltage and temperature applied. This ensures a safe and low-bounce switch-on. In holding mode the PWM controller regulates the coil current. This significantly reduces power consumption and heating. At the same time the reliability of the contactor is increased.

Specifications (preliminary data)

C320K, C320S
Type of voltageDC bidirectional, AC (f ≤ 60 Hz)
Main contacts, configuration1 NO
Rated operating voltage UeC320K: 1.500 V
C320S: 60 V
Rated insulation voltage Ui1.800 V
Rated impulse withstand voltage Uimp10 kV
Pollution degree
Overvoltage category
Conv. thermal current Ith1,000A @ 85° C
Rated short-time withstand current Icw5,000 A @ t = 1  s
Breaking capacityC320K/...: 60 operations @ L/R=0,1 ms, Ue=1,500 V, Ie=750 A
Auxiliary switches4x SPDT max. with mirror contact function, single-break
Snap-action switches S870: AC-15: 230 VAC/1.5 A; DC-13: 60 VDC/0.5 A
Coil voltage Us24 V DC
Coil tolerance0.7 ... 1.25 x Us
Mounting orientationhorizontal, vertical
(do not mount upside down)
Temperature range-40° C ... +85° C
Mechanical endurance2 million op. cycles
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C320 – DC bidirectional switching