Square D Q1370 Circuit Breaker

Square D Q1370 is a 70-amp, 3-pole molded-case circuit breaker from Schneider Electric's Square D Q1 family. Rated for 240 VAC, this plug-in unit provides thermal-magnetic overcurrent protection for three-phase circuits and carries an interrupting capacity of 10 kA at 240 VAC. The Q1370 is designed for use in compatible Square D Q1 panels, safeguarding feeders and equipment on 240 V three-phase networks up to 70 A. Its molded-case construction and three-pole configuration enable simultaneous disconnection of all three hot conductors, simplifying wiring layouts in compact panels. This unit is suited for commercial and light industrial distribution where 70 A protection is required on 240 V 3P circuits, and it pairs with standard Square D accessories used in Q1 installations. When selecting a replacement, confirm the panel accepts Type Q1 breakers and verify that the current rating and interrupting capacity meet the service requirements for the protected circuit. Typical considerations include conductor size within the unit's ampere rating, available mounting space, and compatibility with the panel's bus system to ensure proper fit and reliable tripping behavior.