Block Signalling BOD4-RLY Infra-Red Train Detector with Relay The BLOCKsignalling BOD4-RLY is a compact infra-red detector which detects trains passing over the sensor and operates a built-in relay in response. No programming necessary (but you can adjust all settings if you wish) Low current output ( 5V DC) to feed leds, signals or small relays Very easy to connect up to simple indications on a control panel, operate motors, signals, electromagnets, or to add as inputs to computer systems Built in relay to handle up to 1.5A at 24V Detects passing trains using an attached infra-red sensor (included) Quick and easy way to detect trains anywhere on your layout, even in tunnels Requires a 12V DC Power Supply
