N_Cook
Guest
Thu Dec 29, 2011 11:46 am
Used with an amp with mains drop out occassionally, after an hour or so of
use
but nothing found wrong with the amp and
no reported problems with the mains.
Anyone aware of problems with these supposed surge suppressors?
or even how they work
A GDT
axial 115 deg C 5A (one-time?) thermal fuse and a small radial thermal
switch or fuse , probably one of those miniature bimetal dome resettable
combined temp + current switches
X2 yellow block and 3 green polyester caps, is all the componentry ,no
active seen other than
2x100K , 2x LED, 2x 4007 for 2 indicators
Vibrated the radial sw with engraver tool and not found susceptible. But if
a cap was going ohmic and passing excess current there could be intermittant
problem via that, but no discolouration on any cap. To get to the pcb proper
would mean destroying spot weld power lead connections.
This amp is regularly PAT tested, whether with this adaptor in line not
known and because
pcb traces not seen, don;t know if there is a ground connection involved.
Obviously advicing the owner to obtain another one if he wishes to continue
using a surge protector, as an interim and removing the adaptor for future
PAT testing , rather than suspecting amp internal mains Tx wiring at this
stage
William Sommerwerck
Guest
Thu Dec 29, 2011 12:32 pm
I'm assuming the "drop out" is caused by the circuit breaker in the surge
suppressor, and that resetting it restores operation.
A fire marshall told me that surge suppressors sometimes have poor-quality
circuit breakers. Their resistance is too high, and they overheat. This can
cause fires.
I suspect the breaker is bad. Once the amp runs long enough, the breaker
gets hot enough to trip.
N_Cook
Guest
Thu Dec 29, 2011 1:15 pm
William Sommerwerck <grizzledgeezer_at_comcast.net> wrote in message
news:jdhj4v$tt2$1_at_dont-email.me...
Quote:
I'm assuming the "drop out" is caused by the circuit breaker in the surge
suppressor, and that resetting it restores operation.
A fire marshall told me that surge suppressors sometimes have poor-quality
circuit breakers. Their resistance is too high, and they overheat. This
can
cause fires.
I suspect the breaker is bad. Once the amp runs long enough, the breaker
gets hot enough to trip.
As they are combined current and temp trip then makes some sort of sense
even if the amp only takes 1 amp of mains . But over an hour and a bit of
contact corrosion/localised heating or something is enough to supply the
temp component .
Googling around Belkin surge protectors a reported problem is Neutral -
Ground short internally to them , which could easily be due to PAT testing ,
but confirms there must be a connection to mains ground inside them
