C310 – AC and bi-directional DC contactors up to 1,500 volts

Compact single-pole NO contactors for AC and DC (bi-directional) 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 3,000 amps

C310K/500 Ui up to 1500 V, Ith = 500 A.
Design with blowout magnets and large arc chamber for a particularly high breaking capacity.
C310K/300 Ui up to 1500 V, Ith = 300 A.
Design with blowout magnets and large arc chamber for a particularly high breaking capacity.
C310A/500 Ui up to 1500 V, Ith = 500 A.
Design with blowout magnets, small arc chamber and cover.
C310A/300 Ui up to 1500 V, Ith = 300 A.
Design with blowout magnets, small arc chamber and cover.
C310S/500 Ue = 60 V, Ith = 500 A.
Main contact system w/o arc chamber.
C310S/300 Ue = 60 V, Ith = 300 A.
Main contact system w/o arc chamber.

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 continuously conduct up to 500 amps. In the event of a short circuit, 3,000 amps, can even flow for one second 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 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.


Compact dimensions – high rated insulation voltage Ui up to 1,500 volts

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.
High conventional thermal current Ith up to 500 A

All versions of the C360 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 (1 s)

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.

Full bidirectionality – reliable disconnection of high performances

All versions of the C310 can reliably disconnect high currents and voltages, irrespective of the current direction.

These properties are achieved in the A and K versions through the special arrangement of blowout magnets and arcing chambers, high contact forces and generously dimensioned clearances in the contact aera.

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.

Video - Bi-directional DC NO contactors for up to 500 A



C310K, C310A, C310S
Type of voltageDC bidirectional, AC (f ≤ 60 Hz)
Main contacts, configuration1 NO
Rated operating voltage UeC310K: 1,000 V @ PD3 / 1,500 V @ PD2
C310A: 1,000 V
C310S: 60 V @ PD3
Rated insulation voltage Ui1,000 V @ PD3
1,500 V @ PD2
Pollution degree
Overvoltage category
PD2 or PD3, see Ue and Ui
Rated impulse withstand voltage Uimp10 kV
Conv. thermal current Ith500A @ 40° C
300 A @ 70° C
150 A @ 70° C
Rated short-time withstand current Icw3,000 A @ t = 1  s
Breaking capacityC310K/: 30 operations @ Lmax = 0.25 mH, Ue = 1,000 V, Ie = 500 A
C310A/: 60 operations @ Lmax = 0.25 mH, Ue = 750 V, Ie = 500 A
C310S/: 60 operations @ L/R = 0.1 ms, Ue = 60 V, Ie = 2,000 A
Auxiliary switches2x 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:
12...24 V DC (operating range 9.5...36 V DC) / 48 V DC (operating range 33.6...60 V DC)
24 / 48 V DC
Mounting orientationhorizontal, vertical
(do not mount upside down)
Temperature range-40° C ... +85° C
Mechanical endurance2 million op. cycles (std. magnetic drive)
100,000 op. cycles (latch magnetic drive)
(Replace auxiliary switch after 1,000,000 switching cycles)
Show all data

Related Downloads

Catalogue C310
C310 - AC and bi-directional DC NO contactors for 150 A, 300 A and 500 A
Manual C310-M
Contactors C310 — Installation and Maintenance Instructions
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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