The ABB OVRT270NCU is a 70 kA surge protection device (SPD) from the OVR series, specifically for neutral conductor protection. It sits in the Surge Arrestors & Suppressors subcategory under Circuit Breakers, Fuses & Protection.
Rated at 70 kA, this SPD handles high-energy surge events on the neutral conductor. In a panel, that means it clamps transient overvoltages from lightning strikes or utility switching before they propagate into sensitive electronics downstream. The neutral path is often the one that gets overlooked when specifying SPDs — this unit covers it.