721A 2.1mm Center Pin DC Power Jacks Switchcraft 721A 2.1mm Center Pin DC Power Jacks provide an ideal mate for 2.1mm-style DC power plugs and offer a 30VDC resistive rating and 5A or 7.5A current rating. The Switchcraft 721A operates over 5000 insertion/withdrawal cycles minimum and within a -40°C to +65°C temperature range. This family of 2.1mm pin diameter DC power jacks includes solder, straight, and right angle contact types.