Circuitron 5502 BD-2 Current-Sensing Block Occupancy Detector (2-Color Signal Output)

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The Circuitron 5502 BD-2 Current Sensing Block Occupancy Detector is a current-sensing block-occupancy detector — provides a Red / Green signal output for a single isolated block o f track.What it does: Detects the current drawn by a locomotive or any lighted piece of rolling stock in an isolated block. Drives Red / Green LEDs (for 2-aspect signals) directly. Works with common-rail wired AC or DC track power and with most Command Control (DCC) systems. State-of-the-art IC design for high sensitivity and reliability. Detection method: Current sensing (no track interruption) Output: 2-color (Red / Green) signal drivers Track power: Common-rail AC / DC / DCC Detects: Locomotives + any lighted rolling stock Circuitron SKU: 5502 (Walthers 800-5502) Tip: For trailing freight cars without lights, add a resistor wheel-set per car to keep the block flagged as occupied even when the loco has left.About Circuitron: A USA-made model-railroad electronics specialist (Maryville, Illinois) founded in the 1970s. Famous for the industry-standard Tortoise slow-motion under-table switch machine and its surface-mount cousin the SMAIL. The full range covers detection (block detectors, Opto-Sensor grade-crossing logic), automation (auto-reversers, external relays, twin-coil alternators), signal / lighting electronics (alternating flashers, ditch-light oscillators, strobe drivers), power supplies, and a complete set of Tortoise / SMAIL replacement parts plus the solderless ZipZ connection system. Most circuits work with AC, DC, or DCC track power unless specifically noted otherwise.In stock at Oakville Model Trains Depot. Show more