Free calculator

KNX power supply and line load calculator

Enter your device volume, adjust reserve margin, and validate whether line capacity is likely enough before commissioning.

Calculator inputs

Uses typical device draw values. Add custom current for any additional loads.

Base current
437 mA
Reserve added
109 mA
Estimated total
546 mA
Line utilization
85%
Status: healthy

Line capacity looks healthy. Keep field validation before commissioning.