#309 HO Scale Under-the-Ties Delayed-Action Electric Uncoupler Kit

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#309 HO Scale Under-the-Ties Delayed-Action Electric Uncoupler Kit is available to buy in increments of 1

#309 Under-the-Ties Delayed-Action Electric Uncoupler Kit - HO Scale


#309 Under-the-Ties Delayed-Action Electric Uncoupler Kit - HO Scale

Delayed Magnetic Uncoupling

Kadee® #165 Red - Normally Open momentary contact push button switches are recommend.

Fits any HO code track.

This package contained one HO Scale Magne-Electric electromagnetic, delayed action uncoupler kit, ready to assemble and install Under-the-Ties. It can be installed on any straight layout track, but especially on mainlines, were false uncoupling my occur.

Fits any HO code track.

Operates: 16 volt DC.
We recommend a 16 volt DC power source (at least 3 Amps) or 18 volt AC power source (at least 3 Amps)converted to DC with bridge rectifier.

WARNING: Do not use the uncoupler continually. DO NOT activate the uncoupler for longer than 2 MINUTES at one time.
This will avoid possible overheating which will damage the uncoupler.

#309 Instructions

(Track Not Included)

One per package

UPC: 765484003090

USA Flag  Made in the U.S.A.


Package Includes:

  • (1 only) Coil
  • (1 only) Steel core
  • (4 only) Field plates
  • (1 only) Field plate divider
  • (1 only) Upper track mounting plate
  • (1 only) 10-32 x 7/8" Bolt
  • (1 only) 10-32 Nut
  • (3 only) 2 x 3/8" flat head self-tapping screws
  • (4 only) 0-48 x 1/4" screws
  • (4 only) 0-48 x 3/8" screws
  • (1 only) Bridge Rectifier
  • (1 only) Capacitor

Recommended Accessories:

  • 3 Amp Push button momentary switch
  • SPST - Normally Open (Kadee #165)
  • Light bulb - 14-20 Volts, .2 Amp
  • #20 AWG Wire- insulated, strand in two color codes
  • Rosin Core Solder - 1/16" size
  • Track Section, 3 1/2" long
  • Roadbed Section, 2 1/8" long
  • Metal Rail Joiners
  • Ballast


Recommended Tools:

  • Power or Crank Drill - with 1/4" bit
  • 1/4" Drill
  • #52 Drill (Kadee #780 Tap & Drill set)
  • #55 Drill (Kadee #780 Tap & Drill set)
  • Reg. Screwdriver - with 1/8" head
  • Modeler's Knife
  • Razor Saw
  • Flat Chisel, 1/2"
  • Medium Tooth File - 1/2" wide
  • Household Pliers
  • Soldering Iron
  • White Glue
  • Fine Tooth File - 1/2" wide


Delayed Magnetic Uncoupling

Trouble shooting:

Coil Test: Strip off clear insolation on ends of coil wires with a multimeter on the 200 OHM settings to check resistance. A good coil will have a resistance of about 8.8 OHM.
If it is much less your coil is shorted and will not generate enough magnetic field to uncouple. (Leaving the uncoupler active for too long cause the coil to overheat melting the insolation and shorting out the coil.)

Magnetic Field Test: Before installed in track. With the momentary switch activated, take a piece of steel and it should stick across both field plates.

WARNINGWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
WARNING WARNING: CHOKING HAZARD - Small Parts - Not for children under 14 years.
Kadee Quality Products Co. products are not toys and are not intended for children under 14 years old.
Website disclaimers can be found on the Conditions of Use page.
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