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New PowerShield II | Tech News at Tony's Train Exchange. INTRODUCING TONY'S "eTIPS" NEWSLETTER Tony's own tips as well as news from the world of DC and DCC model railroading delivered straight to your inbox. Click here to sign up! HOME > TECH BULLETIN > DCC COMPONENTS > New PowerShield II PowerShield products have been replaced by PSX products by DCC Specialties All of us who use Command Control Systems are aware of the annoyance and damage caused by track shorts. At the least, a track short interrupts operating, at the worst, it can fry expensive power supplies or related components or hardware. Of course, track shorts multiply in conjunction with the number of operators. There have been many solutions proposed : Ballast Lamps, Relays, Kill Switches and Swearing. None of the above have been good solutions. The problem is that all good power supplies, whether conventional DC or Command Control DC or AC have built in circuit protection that senses a short and shuts down all power in about 1/4 second. While this in most cases protects the power supply, it obviously shuts down all activity until our co-operators get their Loco back on the track, etc. Furthermore, this circuit protection can go on and off with lights, bells or whistles, while our buddy is struggling to get his 18 wheel articulated Loco back on the track. Does it not just drive you nuts? There is now a simple inexpensive solution, new PowerShield II. Tony's in cooperation with Microdesign, the designer, is now offering a smart, third generation, 4 Amp, auto-reset, solid state circuit breaker used to create isolation power districts for DCC operations. Use The breaker provides fast sectionalizing for model railroad track power and self-recloses to provide convenient operation. It should not be used for primary fuse protection of track power sources (which may provide high fault current). It works with DCC power and well-filtered DC power with a voltage of at least 10 Volts, but will not work with 60 Hz (low frequency) AC power sources or low voltage DC. Simply install this breaker in either power buss lead or track feeder group to provide protection. For the ultimate protection and convenient operating, I suggest two Power Shield™ minimum and then one other for each regular operator. Note: Not for direct current (DC) applications. Here is the logic Use Power Shield™ to create power districts. A small layout, 4' x 8' could be one power district. You would install the Power Shield™ on one lead, of the booster output. A short on the layout would trip the breaker sparing the booster and you of the annoying shorts. When the short is corrected, breaker will auto-reset and you are back in action. The breaker will not reset if the short is not corrected. Even on a small layout, I would use two breakers and divide the power for either each half of the layout or one for the mainline and one for the yard or sidings. The larger the layout, the more power districts you will want to segregate active areas. Each Power Shield™ will handle enough current to run 2-8 Locomotives, depending on scale and Loco current draws. If you are skeptical, here are the reasons you should use Power Shield™: Mixer or Booster Protection: Even though these units have built in protection, the protection circuitry after numerous shorts will eventually fail. Locomotive or Electrical Accessory Protection: Power Shield™ eliminates the extremely violent voltage and current spikes caused by hard shorts which can melt wheels and accessories. Fault Isolators: When Power Shield™ trips, you know where the problem is. Enjoyable Uninterrupted Operating: This is number one in my opinion. Power Shield™ keeps the layout up and running for those operators who can stay on the track or avoid running against turnouts. Features The breaker is fully solid-state and provides fast interruption when the trip current is reached (about 4 Amps). Reclose is automatic after about 2 seconds. If the circuit still draws trip current, the breaker retrips, continuing this process until the problem is cleared. Positive visual indication of trip is provided by an LED (on during trip). Basic (power) connection (see board layout below for connector locations): DCC POWER SOURCE DC POWER SOURCE BOARD LAYOUT A LED on the board will light when the breaker is tripped. Remote indication of the breaker status is available with either: 1 - An additional LED wired to terminals on the printed circuit board to indicate that the breaker is tripped. 2 - A (track voltage) light bulb wired to terminals on the board to indicate either the tripped or normal (power on the track) condition. Remote LED to indicate breaker is tripped Light bulb to indicate tripped (J1A to J2A) Light bulb to indicate normal (power on track) (J2A to J3A) We welcome comments or suggestions from readers; please write or call. Phone: 800-978-3472 or 802-878-5005. The entire site © 1997-2013 by Tony's Train Exchange. All rights reserved. Can't find it? Try Tony's Sitemap.