DA640: Tri-colour Yellow Red & Green LED indicator
Used with DC circuits this tri-colour LED will illuminate either RED or GREEN depending which way round it is connected. To change between RED and GREEN illumination, simply reverse the wires. Used with AC circuits both red and green LEDs will light up giving a YELLOW indication to show that AC voltage is present.
Typical uses include indications for power supply units, relays, camera and magnetic locks. With it's wide range input of 9-30V, displaying yellow on AC and Red/Green depending on the polarity of DC It is also commonly used as a temporary indicator to aid with installations.