Under the designation CW-301 CANpwr, CANWAY offers a module for fast automated control of power relays via CAN messages and manual switches. This makes it possible, for example, to activate the power supply in mobile measurement applications by means of a specific CAN bus signal or charge batteries installed in measurement technology according to defined vehicle statuses. The main field of application envisaged for the new module is the development departments of automotive OEMs. 


The CW-301 is equipped with three switchable outputs with nominal voltages of 12 VDC or 24 VDC. It is rated for a maximum switching current of 10 A per voltage output. Thermal circuit-breakers safeguard the manual and CAN controlled circuits. The maximum switching capacity is 360 W at 12 VDC and 720 W at 24 VDC. The response and release times are specified as 10 ms at 20 °C. Providing data transmission rates of up to 1 Mbps, the CAN module supports the CAN protocol 2.0A (optional 2.0B) to ISO 11898-2. It is optionally possible to terminate the CAN bus with a 120 Ohm terminating resistor. In addition to automated control via CAN bus, the CW-301 is also equipped with toggle switches to facilitate switching the outputs manually.

The CAN protocol supports a range of different settings. Based on user data contained in the message it is possible to set a follow-on time of up to 100 minutes as well as message IDs and switching conditions per channel. Utilizing filters and masks it is possible to take into consideration any number of data bits as switching conditions. In addition, these also make it possible to configure simple conditions (greater/smaller than, equal to).

The module is housed in an IP40 rated, anodized aluminium housing measuring 171 x 71 x 113 mm (LxWxH). It is designed to operate in temperatures ranging from -20 °C to +70 °C. It requires a power supply of 9-30 VDC. In sleep mode the CW-301 draws a current of 9 mA at 12 VDC. A 9-pin sub-D connector is available to connect the CAN bus.