IUG Magnetic Circuit Breakers AIRPAX / Sensata IUG Magnetic Circuit Breakers feature a maximum 50A rated current, a 50/60Hz frequency rating, and a maximum 250V rating. The IUG series has a four-terminal coil and relay construction that withstands 1500VAC. AIRPAX / Sensata IUG Magnetic Circuit Breakers provide low-cost power switching, reliable circuit protection, and accurate circuit control for equipment in the international marketplace.