Airpax M-209 Circuit Breaker

Airpax M-209 is a three-pole, 240 V AC hydraulic-magnetic circuit breaker in the Airpax 209-series (E-Frame) designed for panel-mounted protection in electrical systems. Rated at 51.3 A, it provides UL489-compliant, trip-free protection that responds to overloads with a hydraulic delay, helping minimize nuisance trips from temperature variations and inrush currents in 50/60 Hz networks. This panel-mount device typically uses screw termination and is intended for use in distribution panels, HVAC/R equipment, lighting-control panels, and general EDP applications where reliable overcurrent interruption is essential. The 209-series family is known for rugged performance, able to withstand high pulses and shocks (up to 100 g repeatedly) and to resist moisture-related degradation with protective finishes, making the M-209 suitable for demanding environments. With its hydraulic-magnetic mechanism, the breaker provides stable trip characteristics over varying temperatures and supply conditions, ensuring circuit protection even in installations subject to vibration and harsh conditions. As a UL489-listed, multi-pole protection solution, the M-209 complements other Airpax 209-series devices in creating compact, modular protection schemes for modern electrical panels and control systems.