Edco HSP-121A Series External Mount 120 VAC Protection. The Edco HSP-121A is a UL 1449 Listed, three-stage power line protector. Features include noise ?ltering, NEMA-4X enclosure, common mode and normalmode protection.

In addition, the HSP-121A can be installed using conduit?ttings and can be mounted inside or outside of electronic enclosures. The Edco HSP-121A offers a replaceable fuse designed to remove the load(protected equipment) from the line if the unit is either overloaded or theinternal protection fails. This feature prevents surges from entering equipmentthrough a failed protector, not noticed by the user. Unlike models with only an indicator, whichmay take weeks to notice, the HSP121A demands immediate attention upon theunlikely occurrence of internal failure.