Hi Ken, When i use my 252 power supply with my triton IV i have had the same thing happen a few times. But only when the match is bad or if i don't have an ant. connected to the radio. If you draw more than 20 amps because of an ant mis-match the circuit breaker pops. It is what saves your finals. If you use the rig with a different power supply they want you to use a circuit breaker in your power line for protection. Larry N1YW I am a new owner of a Omni D and when turn up the drive, it kicks the P/S off, all help would be appricated Ken N4ALP P/s the Ps is a 252 m _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec