Part identity and ratings
The AF16ZB-30-10RT-21 is a 3-pole contactor rated 30 A, with a coil voltage range of 20-60 VDC. It sits in the Contactors and Starters category, subcategory Electrical Contactors. The 30 A rating covers resistive and moderate motor loads within that continuous-current envelope — match it to the full-load amps of the motor or heater bank, not the nameplate horsepower alone.