AAR4 Advanced Auto Reversing Unit
Item #:
AAR4
Price/ea:
$79.99  $74.99
$59.99 (4 or more units)
Average Rating:
AAR3 Options
Quantity:
Your Price:
$74.99
Details

AAR4 Advanced Automatic reversing System

Pre-Orders now being taken now at special price of $74.99 for shipping begining on Dec 15th 2025! 

AAR4 Advanced Reversing Unit with adjustable timing and
Microcomputer Control. Suitable for HO and N scales using DC power up to 1
amp. 15 volt Power Supply and Train Throttle control (PWM) included.

Installation Note: The AAR4 unit is designed to operate with Locomotives & Trolleys wired per NMRA standards. It has been reported to us that certain Trolleys are wired in reverse and require a change to the connections to the AAR4. If your loco or trolley starts up in the opposite direction that shown in the installation diagram with AAR4, the wires will need to be reversed in order for the diode sensors to stop the train / trolley at each end! 

  

Features:

MicroController based system.

Works with locomotives & trollys drawing up to 1 amp of DC power (HO & N )

Fully assembled in a plastic case

Easy installation, The Basic System requires only two wires. A track gap required at each end and a 
diode across the gap that stops the loco or trolley,

Terminal Block Outputs for easy connections.

Diode Sensing to eliminate optical sensors & adjustments.

Point to Point, Point to Point with adjustable timing delay.

Station Stops with adjustable delay (requires optional BKD-2000 detector, 1 amp

Continuous Loop with Station Stops (requires optional BKD-2000 detector, 1 amp

Custom programs can be quoted on request

  

Installation:

The unit is designed to work with most standard DC model railroad locomotives and trolleys. No Power Pack require as the unit is complete
with a 15 volt DC power supply and built in PWM Throttle control for smooth operation at low speed.

Typical installation diagrams are included with the ARR4 system.

 

Options:

Typical Applications:

Point to Point Trolley or Bud Car layouts (requires optional BKD-2000 for station Stop in center block)

 

Circular Loop Layouts with Station stops (Requires optional BKD-2000)

 

 

 

 

 

 

 

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