Surge Protection: Mains Filter

Hard wired 20A single-phase surge protection filter

Thermal fuse to protect against further damage after a power surge.

OE’s single phase hard wired 20A surge protection filter provides protection against voltage transients, low and high frequency noise and asists with the reduction of harmonics generated by electronic equipment.

The first stage of the single phase surge protection filter contains a 4th order LC filter with additional Y capacitors which creates an effective common and differential mode filter. This filter reduces noise and unwanted harmonics to protect sensitive electrical systems. Metal Oxide Varistors (MOVs) are placed directly across the load side of the filter network to arrest any transients over 275Vrms. MOVs dissipate the excess voltage spikes as heat and are connected between Active / Neutral, Active / Earth and Neutral / Earth, for full protection.

The single phase surge protection filter input circuit incorporates specially designed common and differential mode toroidal chokes that absorb a large proportion of the incoming transient. These inductor chokes reduce the strain usually placed on MOVs resulting in lower let through voltages to the load. The MOVs are protected by a replaceable fuse, and a non-replaceable thermal fuse, should the incoming surge be greater than the rated capacity of the MOVs..