A new current limiter module, designed to reduce the current surge when loads such as transformers (especially toroidal types), switch-mode power supplies or small motors are first switched on, has just been introduced by REO UK Ltd. Key features are said to be compactness and high efficiency.
The ED1 / 16 module eliminates problems such as blowing of fuses and nuisance tripping of breakers due to momentary, excessive current draw by the load, during start-up. The ED1 / 16 is suitable for applications where initial current in-rush might be up to 7-10 times nominal across frequencies ranging from 45 to 65Hz.
A semiconductor is used to reduce the supply voltage level for the first few mains cycles (approximately 500ms in duration) and then afterwards the semiconductor is by-passed allowing the voltage to rise to its nominal mains level. The unit has a nominal current rating of 16A.
Installation is very simple; the module clips onto a standard DIN rail and has screw terminals for series connection with the load.Dimensions are: approximately 10cm x 8cm footprint x 8cm high.
The unit was first developed for use with medical transformers that are also produced by REO