Circuit & System Protection


PTC thermistors limit inrush current

15 April 2009 Circuit & System Protection

Epcos has extended its series of PTC inrush current limiters for power supplies with the newly packaged B5910XJ family.

The new PTC elements have comparable electrical properties to their predecessor types, but their heat capacity has been increased from 2 J/K to 2,3 J/K. This means that fewer parallel-connected PTC resistors are needed to charge large link-circuit capacitors. The package design has also been improved. The PTCs are designed for voltages of 260 V, 440 V and 560 V with rated resistances of 22 Ω, 56 Ω and 100 Ω.

Six new types of leaded PTC inrush current limiters with heat capacities of between 1,0 J/K and 1,4 J/K have been developed for small loads and few switching cycles.



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