HMC 120V AC Circuit Breakers Phoenix Contact HMC 120V AC Circuit Breakers are certified for hazardous locations: Class I, Division 2, Groups A, B, C, and D. These fully sealed hydraulic-magnetic breakers provide accurate power switching and reliable overcurrent protection. Each breaker is rated for 50V DC, and breakers up to 15A are also dual-rated at 120V AC. Other features include UL approval, 1kA short-circuit current rating (SCCR), and -40°C to +65°C temperature operating range. Phoenix Contact HMC 120V AC Circuit Breakers offers pluggable line and load terminations with a T-bus option that allows breakers to snap into a common power bus. These features ease installation and reduce wiring. The housing uses a unique plastic material that allows for large temperature swings and stays flexible without cracking.