#708 HOn3 Scale Thru-the-Ties Delayed-Action Electric Uncoupler Kit

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#708 HOn3 Scale Thru-the-Ties Delayed-Action Electric Uncoupler Kit is available to buy in increments of 1

#708 Thru-The-Ties Delayed Electric Uncoupler Kit - HOn3 Scale

HOn3-Scale      MAGNE-MATIC

#708 Thru-The-Ties Delayed - Action Electric Uncoupler Kit

Delayed Magnetic Uncoupling

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

This package contained one HOn3 Scale Magne-Electric electromagnetic, delayed action uncoupler kit, ready to assemble and install through a hole in the track. It can be installed on any straight layout track, but especially on mainlines, were false uncoupling my occur.

Fits codes 70, 60, 55 track & other sizes down as small as code 40.

We recommend a 8-12 volt DC power source
(at least 3 Amps).

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.

Also adaptable to TT-Scale

#708 Instructions

(Track Not Included)

One per package

UPC: 765484007081

USA Flag  Made in the U.S.A.


Package Includes:

  • (1 only) Coil
  • (1 only) Steel core
  • (2 only) Field plates
  • (1 only) Field plate divider
  • (1 only) Upper track mounting plate
  • (1 only) Lower track mounting plate
  • (1 only) 10-32 x 3/4" Bolt
  • (1 only) 10-32 Nut
  • (2 only) 209 fiber washers
  • (2 only) 2 x 3/8" flat head self-tapping screws

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
  • Fiber Washers - various thickness


Recommended Tools:

  • Power or Crank Drill - with 1/4" bit
  • 1/4" Drill
  • #20 Drill
  • Hand Sander - w/coarse & fine paper
  • 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
  • Contact Cement
  • Cyano Acrylate
  • White Glue
  • Fine Tooth File - 1/2" wide


Delayed Magnetic Uncoupling

Distributor must purchase in bundles of 3

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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