The module CW-301 makes it possible to switch power relays by means of CAN messages and manual switches. As a consequence, it is possible, for example, to switch on the power supply to mobile measuring equipment by means of a specific CAN bus signal (e.g., KL15) or charge batteries installed in measurement technology to defined vehicle states.

The CW-301 is equipped with three switchable outputs and can be operated with a maximum switching current of 30 A. 10 A thermal circuit breakers protect the manual and CAN controlled circuits.

It is possible to configure a wide range of different settings via the CAN protocol, such as the baud rate, CAN message, sleep mode and follow-on time.


  • 3 voltage outputs 12 VDC or 24 VDC
  • 10 A switching current per voltage output
  • Protected by thermal circuit-breakers
  • Manual or CAN controlled voltage outputs
  • CAN message, CAN signal and switching conditions user selectable
  • Low current consumption in sleep mode
  • Adjustable follow-on time up to 1 hour



Voltage Outputs

Number: 3
Nominal voltage: 12 VDC or 24 VDC
Switching current: 10 A per voltage output (protection though thermal circuit breaker)
Switching power max.  120 W per channel at 12 VDC
Switching cycles: ≥ 100.000 
Response time / fall time: ≤ 10 ms (at 20 °C) 
Connector: Socket for 4mm connector (banana jack)


Number: 1
Type: ISO 11898-2 (highspeed)
CAN-protocol version 2.0 A and 2.0 B, supports SAE J1939 (29-bit-identifier) 
Data rate: 50, 100, 125, 250, 500, 800 and 1000 kBit/s
configurable via CAN-bus
Termination: 120 Ohm, optional
Connector: D-Sub9-connector

Power supply

Supply voltage: 9 to 30 VDC
Current consumption: 30 mA at 12 VDC (unswitched)
510 mA at 12 VDC (switched on, without load current)
Connector: LEMO ECG.3B.302

Environmental conditions

Temperature range operation: -20 °C to +70 °C
Temperature range storage: -20 °C to +85 °C
Relative humidity: 35 % to 85 % non-condensing
Protection class: IP40

General Information

Housing: HF-Tubus 
Dimensions (LxWxH): 71 mm x 131 mm x 171 mm
Weight: 1.100 g


Datasheet CW-301

Download (PDF)

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