The Square D XO240 is a two-pole, 40-amp circuit breaker rated for 120/240-volt service. Cataloged as Type XO from the Cutler-Hammer lineage, model XO240, this device provides overcurrent protection by interrupting current during overload or short-circuit conditions. Its two-pole construction interrupts both hot legs of a 120/240 V circuit, helping safeguard conductors and connected devices from fault conditions. This configuration is intended for protection of larger branch circuits within 120/240 V electrical systems where reliable interruption of both legs is required.
