The 1.5KE130A: With a breakdown voltage minimum of 124 V, the device starts conducting just above the 111 V standoff level, so a 120 V nominal DC bus or a 110 V AC rectified rail stays protected without nuisance triggering. The 179 V clamp at 8.5 A means downstream components rated for at least 180 V peak see a safe voltage during a surge — a typical 150 V-rated MOSFET or capacitor would be at risk without this clamp.
Temperature range and package — fits harsh environments and standard assembly
The DO-201AA axial-lead package (also known as DO-27) is through-hole, compatible with wave-solder and hand-solder rework — no special reflow profile needed.