TRANSTECTOR's 1101-517-2303 MCP-30-120TH-MA1 SPD is used to protect 120 / 240 VAC 2 phase split power supplies from over-voltage caused by transient surges. This hybrid SPD features replaceable silicon diode and MOV suppression modules coupled with VSP surge rated fuses. The SPD is housed in a NEMA 1 metal enclosure. The replaceable SPD modules feature both visual status indication and electrically isolated Form C dry contacts for remote monitoring capability.