An overview of circuit breakers, LED Driver
input and inrush current, and how to load a
circuit breaker with Inventronics LED Drivers.
Inventronics Circuit Breakers
2
www.inventronics-co.com Inventronics Circuit Breaker
Contents
Introduction ................................................................. 3
What Trips a Thermal-Magnetic MCB?........................ 3
LED Driver Input Current ............................................. 4
LED Driver Inrush Current ............................................ 4
Inrush Current Factors ............................................. 5
Example Showing How Input Voltage Influences
Inrush Current ..................................................... 5
Example Showing How Temperature Influences
Inrush Current ..................................................... 5
Inrush Current Waveform ....................................... 6
Tip ........................................................................ 6
Inrush Calculation .................................................... 7
Derive Datasheet I
2
t Value for Drivers < 60W ..... 7
Derive Datasheet I
2
t Value for Drivers > 60W ..... 7
MCB Standards and Regulations.................................. 8
MCB Ampere Ratings ............................................... 8
Note ..................................................................... 8
MCB Tripping Characteristics .................................. 9
Considering Inrush Duration < 50ms ................. 10
“How Many LED Drivers Can I Use Per MCB?” .......... 10
Calculation Reviewing the Nominal Input Current
Limitation............................................................... 10
Calculation Reviewing the Inrush Current Limitation
............................................................................... 11
Comparing Calculations ......................................... 11
Increase Number of Drivers per MCB When
Limited by Input Current ................................... 11
Increase Number of Drivers per MCB When
Limited by Inrush Current ................................. 11
Summary .................................................................... 12
Note ................................................................... 13
Disclaimer .............................................................. 13