CA3-B0-24-640-31A-D is a 3-pole hydraulic-magnetic circuit breaker designed for compact, high-amperage applications requiring reliable overcurrent protection. This breaker is rated for 40 amps at 24V DC with a series trip (current) circuit configuration and features a recessed off-rocker actuator with 6-32 x 0.195 inch mounting hardware. The unit employs a unique arc chute design that enables high interrupting capacities, making it suitable for demanding industrial and marine environments. Common applications include renewable energy systems, generators, welders, military equipment, and industrial automation where robust protection and compact form factor are essential.