BKxx50 and BKxx51
The Bus Couplers / Bus Terminal Controllers require an operating voltage of 24 VDC. Use a 4 A fuse or a Class 2 power supply to comply with the UL requirements.
The connection is made by means of the upper spring-loaded terminals labelled Us and GNDs. This supply voltage is used for the electronic components of the Bus Coupler and Bus Terminal Controllers and (via the K-bus) the electronic components of the Bus Terminals. It is galvanically separated from the field level voltage.
![BKxx50 and BKxx51 1:](Images/png/3028226059__en-US__Web.png)
![BKxx50 and BKxx51 2:](Images/png/3028206603__Web.png)
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![]() | Note the UL requirements for the power supply. To comply with the UL requirements, the 24 VDC supply voltage for Us must originate
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![]() | No unlimited voltage sources! To comply with the UL requirements, Us must not be connected with unlimited voltage sources. |