The XP3510 1000 is a Lamp Proving Module which is used to monitor the current flowing in a 120Vac lamp circuit. It provides an output which is OFF when the current is below a pre-set threshold level for more than 0.25 seconds. The pre-set threshold is adjustable for a current in a measured circuit between 50mA and 250mA RMS. Features include DIN rail mounting, over 10 yrs of reliable history and it is available off the shelf.