The XP3788-1000 is a Lamp Proving Module with Surge Protection. The Lamp Proving Module is used to monitor the current flowing in a 120Vac lamp circuit and is fully compliant to EN50121-4 Emission and Immunity of Signalling Apparatus. It provides an output which is OFF when the current is below a pre-set threshold level for more than 1 second. The pre-set threshold is adjustable for a current in a measured circuit between 40mAand 80mA RMS. Other adjustable ranges can be configured to customer requirements.