UL 1449 3rd-Edition-certified OVR DIN-rail surge protective devices (SPDs) are approved as UL Type 4 recognized components and are usable in Type 2 applications intended for permanent installation on the load side of the service equipment overcurrent device. The SPDs have pluggable cartridges, so the circuit need not be isolated, nor does the entire device need to be removed when replacements are needed. Wiring an integrated 3-point 1 A volt-free contact enables the operational state of the SPD to be monitored remotely.
