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You are looking at a DCC Specialties - PSX-3 - three output intelligent circuit breaker. PowerShield X Series Circuit Breakers for DCC PSX3 DCC Solid State Power District Circuit Breaker, 3 Block, 0-20 Amps/Block.* *The PSX circuit boards are scribed and milled so you can seperate [for example] a PSX4 into four individual boards if necessary. The PSX is designed to specifically handle low power starter systems by simply jumping pins J6-1 & J6-2 together. This applies specifially to: NCE Power Cab Digitrax Zephyr If you use AC power [Lionel, MTH, and American Flyer AC] order the PSX-AC. Contact us first if you have any questions. All PSX Series DCC Circuit Breakers include Network Feedback, Shorted and Occupancy Status to Digitrax LocoNet, Lenz ExpressNet and NCE Cab Bus. As delivered from the factory, the PSX-1’s trip current is 3.81 amps. You can adjust it from 1.27 amps to 17.8 amps easily via programming or jumper connections on the board The PSX series has the most reliable operating features that protect model railroad equipment and wiring from damage during a short circuit, including fast-acting, solid-state electronics. The Power Shields are available in 1, 2, 3, and 4 circuit-breaker models, allowing you to divide the output of a single booster into independent power districts. The PSX circuit board is wired between the DCC system’s booster and the track bus The PSX includes screw terminals for easy connections from the booster and to the track. There is also an extra pair of terminals for linking the booster power input wires to additional PSX breakers should you need to add extra PSX protected power districts The PSX models have a wealth of new programmable features such as occupancy detection and adjustable trip current making them much more than simple circuit breakers. With Adaptive Load Reset the PSX breaker can tell the difference between a short circuit and power hungry sound decoder capacitors, a welcome relief for many sound frustrated model railroaders. The PSX also offers a lot of great advanced features such as panel mounted LED indicator lights and switches for resetting the breakers manually just involve connecting wires and components to the PSX. Protected by U.S. patent numbers 7810760, 7810761, 7810435. DCC Specialties is so confident about the PSX’s quality and performance that they are providing a 1 year “Goof Proof Warranty”. The retail price is $124.95. It is new in the box. Shipping via USPS. Thank you for looking at our auction and Happy Rails.