The AB3-X0-00-012-3B1-C is a 3-pole A-Series hydraulic-magnetic circuit breaker designed for precise overcurrent protection in compact panel-mount applications. This breaker is rated for maximum voltage of 277 VAC at 50/60 Hz or 80 VDC, with a maximum interrupting capacity of 7,500 amps, and supports current ratings ranging from 0.020 to 50 amperes depending on configuration. The unit features Q.C. (quick-connect) tab terminals in a series trip circuit configuration, with a breaker width of 2.280 inches (57.91 mm) and a panel cutout depth of 2.450 inches (62.23 mm). The 3-pole design with multi-pole handle tie kit provides coordinated tripping across all poles for enhanced system protection. Common applications include marine systems, renewable energy installations, industrial automation, medical equipment, and commercial food service equipment where reliable electrical load protection is required.