The CW-321 facilitates controlling and switching up to 6 high-performance relays via a CAN bus. In conjunction with its top-hat rail housing (45 mm to DIN) the CW-321 module offers a fast and simple solution to automate switching higher currents, for example in component tests on HiL test benches as well as in a wide range of different tasks in automation technology.

The selected state encoding of the relay in the CAN messages allows both targeted actuation of a single relay channel as well as the simultaneous switching of several relays.

The CW-321 is designed to directly control high-performance relays in vehicles as a standard function. It is possible to implement customer-specific modifications for other relay versions at any time.

In conjunction with our bus technology modules CW-101 and CW-102 it is possible to connect the CW-321 directly to a notebook or PC. Control functions are performed with the aid of the software CW-901.


  • Up to 6 channels to control power relays
  • Control via CAN bus
  • Selective control of a single channel or simultaneous control of several channels possible
  • Includes high-power vehicle relays (12 V / 70 A or 24 V / 30 A), base-mounted on top-hat rail
  • Quick and easy to install, suitable for top-hat rail (45 mm to DIN)
  • Easy to extend and scale channels



Switching current: 30 A or 70 A (optional assembly of customized relay)
Switching power (max.): 1800 mW
Switching cycles: ≥ 100.000
Response time / fall time: ≤ 10 ms (at 20 °C)
Galvanic separation: Relay channels


Number: 1
Type: ISO 11898-2 (Highspeed)
CAN-protocol version 2.0 A and 2.0, supports SAE J1939 (29-bit-identifier)
Data rate: 50, 100, 125, 250, 500, 800 and 1000 kBit/s
Termination: 120 Ohm, optional activation via jumper

Power Supply

Supply voltage: 9 VDC to 16 VDC
Current consumption: 50 mA at 12 VDC (no relay switched on)
1 A at 12 VDC (all relays switched on)

Environmental conditions

Temperature range operation: -20 °C to +65 °C
Temperature range storage: -20 °C to +85 °C
Relative humidity: 35 % to 85 %, non-condensing

General information

Housing: 45 mm DIN-top-hat rail housing
Dimensions (LxWxH): 285 mm x 70 mm x 85 mm
Weight: 109 g


Datasheet CW-321

Download (PDF)

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