Spec Sheet Preview: The Alpha Communications® / S.T.R.™ NG20 and NGC20 15VDC regulated power supplies are used with our S.T.R.™ series video-intercom and/or intercom systems. They provide 15VDC (630mA) regulated DC output for various system functions. The NG20 and NGC20 power supplies are designed to easily surface mount right onto the finished wall by means of customer supplied screws or the convenient plastic 'Din Rail' bracket supplied with each switching adapter. Connections are positive screw …