power and surge protection filter


The 121380 is a Mains voltage filter with additional surge protection. It provides protection against voltage transients, low and high frequency noise, and assists with the reduction of harmonics generated by electronic equipment. Single Phase Surge Protection Filter, with status monitoring and overload protection.

The first stage of the 121380 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 input circuit incorporates specially designed common and differential mode toroidal chokes that absorb a large proportion of the incoming transient. These inductor chokes are very robust and 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.

LED indicators are fitted to give a visual status alert to the user. In the event of a very large surge or lightning strike nearby, the fuse will disconnect the active from the surge protection network, the green LED will then turn off and the red LED will turn on.

Amber ON Power is connected.
OFF Power is OFF.
Green ON Protection OK.
OFF Protection circuit fault (service required - check fuse).
Red ON Protection circuit fault (service required - check fuse).
OFF Protection OK.

If after replacing the fuse (disconnect all power before doing so) the LEDs do not return to the "Protection OK" state, this means that the thermal fuse has activated. The product must then be replaced or returned to Elsafe for service. A remote status monitoring facility is available as an optional extra.

pdf-icon sml 50x47 click to download the POWER AND SURGE PROTECTION FILTER Product Sheet