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Reply to "MRC AH501 transformer problems...design flaw and trouble shooting"

@papajoewill posted:

I recently just got one of the AH501 units and it won't enter short circuit/overload and will basically weld the track whatever metal it is. I got a few burn spot on the track now after testing, then eventually just sticking the wires together to simulate instead of continuing to ruin the track. Does anyone have any ideas or would I be out of luck and just move onto a new power supply? I'm pretty stumped and don't want to hurt myself or the trains.

If you're interested in a fast acting external breaker to use with the MRC AH501 variable track output, an AirPax Instant Breaker would offer very good protection when combined with TVS diodes.  A less expensive (in the short term) solution would be an external  7.5 Amp Fast Acting fuse, with lots of spares.

The AH501 User Manual indicates this transformer is capable of 130 Watts of sustained power output.  That would suggest that it has a 7.5 Amp maximum safe operating current limit.

The

7.5 Amp   PP11-0-7.50A-OC-V   https://www.onlinecomponents.c...50aocv-10090644.html

is my recommendation.

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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