Schneider Electric's Square D 997318 is a three-pole circuit breaker rated for 150 amps, built to interrupt all three phases in a three‑phase electrical system. This 3-pole device protects three-phase feeders and connected equipment from overloads and short circuits in commercial or industrial distribution panels that accept Square D/Schneider Electric breakers. Identified by the 997318 part number, this unit serves as a direct replacement component within the Square D family for qualified electrical installations.
