On Sat, 31 Jul 2010 11:47:07 -0700, "Ivan Vegvary"
wrote:


Of course mine comes in a metal mounting box with appropriate lock-outs.
Iggy, there's all sorts of literature about 'heaters'. I have no idea about
what they speak.

"heaters" are mica posts wound with resistance wire. They are in series
with the wire feeding each phase input...IE there are 3 of them and the
motor wiring goes through them from the power supply.

When any one of them draws too much power..they heat up and cause a
bimetal switch to open up, stopping power to the motor.

Its a "fuse", but one that is resettable. Think of it as a circuit
breaker..which indeed it is. Some "heaters" are replaceable with
smaller or larger values so if you need to have it trip at less amps,
you use a smaller set, or at more amps..a larger set.

Very simple, nearly universal in use in virtually all "heavy" machinery.

Since the average "fuse" for machinery costs from $5-30 EACH..having
something reliable and resetable is very important. Particularly when
you have 3 fuses in each machine.....

Gunner


"A conservative who doesn't believe? in God simply doesn't pray;
a godless liberal wants no one to pray. A conservative who doesn't
like guns doesn't buy one; a liberal gun-hater wants to disarm us all.
A gay conservative has sex his own way; a gay liberal requires us all
to watch and accept his perversion and have it taught to children.
A conservative who is offended by a radio show changes the station;
an offended liberal wants it banned, prosecuted and persecuted."
Bobby XD9