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The NMRA has
several Plug and Socket recommendations for various applications:
Small, Medium, Large, and the JST
Decoder Connector.
The one most people call the NMRA Plug and Socket is the Medium connector for HO scale and larger for applications up to 1.5-Amps continuous current applications, 3-Amps peak. This connector is configured with two rows of four pins spaced at 0.1" apart. The drawing below shows that pattern and pin-out numbering for looking into the socket of the connection system. |
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| The pins on the plug for this socket are supposed to be 0.155" in length, ± 0.01", and 0.022" in diameter ± 0.002". |  |
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The
socket part of this connection system is wired to the loco. The decoder
has the plug part of this connection system. Further, the NMRA specifies
the purpose for each connector, and the color of the wires between
the decoder and plug. At left is a chart showing the purpose and color
for each pin of the connector. |
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Typically, decoders
that come with this plug already mounted use the suffix "P"
to indicate that it has the plug on the end of the wires, or suffix
"IP" (for Integrated Plug), "DP" (for Direct Plug),
or something similar to indicate that the plug is mounted directly
on the decoder board without wires. |
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Decoders that come
with the JST Connection system can also have the NMRA plug. The JST
connection system connects the decoder to the wire harness, and the
NMRA plug connects the wire harness to the locomotive, as shown in
the photo at right. |
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| Refer to the JST Connector page for more information. | |||||
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The
Large connector is for O scale and larger. It has a current rating
of 4 amps continuous, 6 amps peak. The pins on this four-pin connector
are 0.3" long, ±0.03", and 0.05" in diameter,
±0.003". |
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| We have not seen any publications about the pin-out of this socket, so we can't indicate which pin is for what. The only information we have is that the orange (Motor right), gray (Motor left), black (Left power pickup), and red (Right power pickup) wires are to be connected to it. Manufacturers are only now (at the time of this writing) starting to use this connector, so they are rare. When we actually get one, we'll be able to indicate the pin-out above. |
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The Small connector
is for N scale and larger. It has a current rating of 0.5-Amp continuous,
0.75-Amp peak. The pins in this six pin in-line connector are 0.2"
long, ±0.01", and 0.01" in diameter, ±0.002".
The drawing below shows the pin-out numbering looking into the socket
of the connection system: |
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This does not include
the common blue. You either have to wire lights for half
wave operation, or use two diodes to get Full-wave from the track.
There may be some European manufacturers using this connector. If
so, we are not aware of it. |
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