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Circuitron SD-2 Three-Position Semaphore Driver #5520
Drive a semaphore to three positions using a Tortoise switch machine and block-occupancy detectors. At least two detected blocks are required for all three indications. The SD-2 needs 10–18V DC; the signal, actuator, and detectors are...
MODEL TRAIN DETAILS
Available to orderThis item is available to order. Review the listed specifications and delivery information.
- Scale
- MULTI-SCALE
- Part number
- CIR5520
Compatibility: Confirm scale, gauge, track family, rail code, power type, DCC status, minimum radius, coupler and required components. Matching scale or brand alone does not prove compatibility.
Shop train parts and accessories- Review the listing photos, specifications and condition notes.
Product details
Drive a semaphore to three positions using a Tortoise switch machine and block-occupancy detectors. At least two detected blocks are required for all three indications. The SD-2 needs 10–18V DC; the signal, actuator, and detectors are separate.
- Manufacturer: Circuitron
- Part number: 5520
- Application: Model railroad electronics and accessories
Specifications are listed alongside the product details above.
Condition & collecting
Match the listed scale and track gauge to your layout. For locomotives, check the power system, decoder and sound details; DCC ready does not mean a decoder is installed. For rolling stock, check couplers, clearance and the manufacturer's minimum-radius requirement where provided.
Shipping & returns
Shipping, taxes and any applicable discounts are calculated at checkout.
