Mersen, STPT23 Surge Protection Device 275 V ac Maximum Voltage Rating 20kA Maximum Surge Current Type 2+3 SPD, Suppressor Type: Type 2+3 Mersen SPD, Mounting Type: DIN Rail, Length: 36mm, Depth: 70mm, Height: 90mm, Dimensions: 36 x 70 x 90mm, MPN: 83230110 / STPT23-20K275V-2PG-LF.