C310 – AC and bidirectional DC contactors up to 1,500 V

Compact single-pole NO contactors for AC and DC (bidirectional) up to 1,500 V rated insulation voltage. Making current up to 2,500 A; conventional thermal current up to 500 A; short-time current up to 3,000 A

Ui up to 1500 V, Ith = 500 A.
Design with blowout magnets, arcing chamber and cover.
Ui up to 1500 V, Ith = 350 A.
Design with blowout magnets, arcing chamber and cover.
Ui bis 1500 V, Ith = 200 A.
Design with blowout magnets, arcing chamber and cover.
Ue = 60 V, Ith = 500 A.
Ue = 60 V, Ith = 350 A.
Ue = 60 V, Ith = 200 A.

As a bidirectional DC contactor, the C310 switches high power ranges within a small footprint. Its making capacity of up to 2,500 A is necessary for discharging intermediate circuits through a resistor.
In the C310A/500 design, the contactor can continuously conduct up to 500 A. In the event of a short circuit, 3,000 A can even flow for one second without the contacts fusing. The contactor therefore maintains its full function in order to disconnect high power ranges if necessary – irrespective of the current direction.
This full bidirectionality is important for systems with a charging and discharging process, such as in battery networks or electric vehicles. Other typical application areas are the DC circuit in inverters, combiner boxes in photovoltaic systems or the management of battery storage systems.


1500 V on 146.2 x 81.0 x 89.7 mm

These are the external dimensions for the width, depth and height of the C310A – without cover. The clearances in the contact area have been dimensioned generously for all designs: The rated insulation voltage is 1,500 V.

The arcing chamber of the C310 consists of plastic, all designs weigh less than one kilogram.
Making capacity Icm up to 2,500 A, bistable design available

The C310 can switch on a current of up to 2,500 A (monostable design in a horizontal installation position; L/R = 0 ms).

A PWM controller regulates the coil current and ensures low-bounce switch-on as well as a low and constant holding power. High contact forces and solid silver contacts benefit the making capacity. The bistable designs do not require any holding power. Their making capacity is 750 A.
Conventional thermal current Ith up to 500 A

In the C310A/500 design, the contactor can continuously carry up to 500 A. (Cross-section of the connections: 185 mm2, maximum ambient temperature: 85°C; terminal heating: +65 kelvin). The value is reached through very high contact forces.

Short-time current-carrying capacity Icw up to 3,000 A (1s)

For one second, the C310 can carry a current of up to 3,000 A without fusing the contacts. This is enough time before the short circuit fuse trips. High contact forces and solid silver contacts support the short-time current-carrying capacity.

Reliable disconnection of high power ranges; full bidirectionality

Design A of the C310 can reliably disconnect high currents and voltages if required, irrespective of the current direction.

C310A/150: 60 switching operations at 500 A; 750 V; L/R = 0.1 ms
C310A/300: 60 switching operations at 500 A; 750 V; L/R = 0.1 ms
C310A/500: 60 switching operations at 500 A; 750 V; L/R = 0.1 ms

These properties are achieved through the special arrangement of blowout magnets and arcing chambers, high contact forces and generously dimensioned clearances in the contact area.
Use in energy technology and electromobility
  • DC side of inverters
  • Generator connection boxes (combiner box)
Grid stabilisation and energy storage:
  • Building energy store
  • Regenerative systems in industrial plants
  • Battery management systems of battery stores
  • Main contactor in electric vehicles
  • DC charging stations
Auxiliary switch with mirror contact function

Series C310 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.

Specifications (preliminary data)

C310A, C310S
Type of voltageDC bidirectional, AC (f ≤ 60 Hz)
Main contacts, configuration1 NO
Rated operating voltage UeC310A: 1,000 V @ PD3 / 1,500 V @ PD2
C310S: 60 V @ PD3
Rated insulation voltage Ui1,000 V @ PD3 / 1,500 V @ PD2
Pollution degree
Overvoltage category
Rated impulse withstand voltage Uimp8 kV
Conv. thermal current Ith500A @ 40° C / 300 A @ 40° C / 150 A @ 40° C
Rated short-time withstand current Icw3,000 A @ t = 1  s
Breaking capacityC310S/...: 60 operations @ L/R=0,1 ms, Ue=60 V, Ie=750 A
C310A/...: 60 operations @ Lmax=0.25 mH, Ue=500 V, Ie=800 A
Auxiliary switch2x SPDT max. with mirror contact function, single-break
Snap-action switches S880: AC-15: 230 VAC/1.0 A; DC-13: 60 VDC/0.5 A
Coil voltage UsStandard: 9.5 ... 36 V DC
Bistable: 24 / 48 V DC
Mounting orientationhorizontal, vertical
(do not mount upside down)
Temperature range-40° C ... +70° C
Mechanical endurance1 million op. cycles (std. magnetic drive)
100,000 op. cycles (latch magnetic drive)

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C310 – DC bidirectional switching