The YC1U-11A120 is an AC contactor from IDEC's YC1U series designed for general-purpose switching of 3-phase and 1-phase AC loads in industrial control applications. It features a 120V AC coil (50/60 Hz) and is rated for 12A at 220V (1-phase) and 12A at 380/400V (3-phase) per IEC 60947-4-1 standards. The contactor has a contact configuration of 3 main poles with 1 normally open (NO) auxiliary contact, a making capacity of 10 times the rated current, and a breaking capacity of 8 times the rated current. It operates at switching frequencies up to 1200 operations per hour with an electrical endurance of 1,000,000 operations and mechanical endurance of 5,000,000 operations. The device is suitable for motor control, load switching, and automation systems requiring reliable AC switching with compact design and long operational life.