Square D LA molded case circuit breakers provide thermal magnetic protection. Their primary function is automatic opening of a circuit under overload or short circuit conditions or manual opening. LA circuit breakers offer many field installable accessories to increase the breaker's application versatility. This shunt trip is an offered accessory for LA/LH/Q4 breakers. Shunt trip accessory is used to trip the breaker from a remote location by trip coil energized from another circuit. The control voltage for operation is 24VDC. This accessory is UL listed.