Battery Selector Switch with AFD. Part No. 2110A. Description. Continuous Amps: 230. Momentary Amps: 345. Dimensions: 5"D x 2-3/4"H. Product Features. Alternator field disconnect (AFD) allows selection of any positions, including "off" without damage to alternator or electrical system. AFD is required on some electrical systems.. Heavy duty copper sweep contacts. "Make before break" contacts allow selection of all positions except "off" while engine is running. Use with 6, 12, 24 or 36 volt systems. New design is easy to retrofit into existing hole patterns. Built-in skirt protects connections. Exclusive flat 360 degree "sweep" contact design provides up to 60% more contact area than other switch designs. Surface or rear panel mounting. Marine grade construction. One year warrantyWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more inform