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Posted by Grant Erwin on January 26, 2008, 2:42 pm
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I picked up some '70s era GE NEMA 1 magnetic contactors, NOS, military
spares. They have overload relays that accept heater inserts and are
adjustable within ±15% of nominal via a thumbwheel. Clearly the heater
inserts are literally just that - they heat the inside of the overload
relay. Beyond that, though, I'm stumped. I'm trying to figure out how
these overload relays work. Anyone know? The overload relay number is
CR124 if that helps.
Grant
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Posted by Ignoramus17333 on January 26, 2008, 2:53 pm
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http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.kilowattclassroom.com%2FArchive%2FMotorOL.pdf&ei=OY-bR7uzK4vOiAHm5uyNBw&usg=AFQjCNEz9b9BPs4tg_lJjAxigvIgZ1ULEQ&sig2=4XURX3hgwd1_FcldMO-zkA
> I picked up some '70s era GE NEMA 1 magnetic contactors, NOS, military
> spares. They have overload relays that accept heater inserts and are
> adjustable within ±15% of nominal via a thumbwheel. Clearly the heater
> inserts are literally just that - they heat the inside of the overload
> relay. Beyond that, though, I'm stumped. I'm trying to figure out how
> these overload relays work. Anyone know? The overload relay number is
> CR124 if that helps.
>
> Grant
>
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Posted by Grant Erwin on January 26, 2008, 3:05 pm
Please log in for more thread options Ah. Bimetallic strip. Makes sense. Doesn't explain how the thumbwheel works,
but gives me a general idea.
Grant
Ignoramus17333 wrote:
>
http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.kilowattclassroom.com%2FArchive%2FMotorOL.pdf&ei=OY-bR7uzK4vOiAHm5uyNBw&usg=AFQjCNEz9b9BPs4tg_lJjAxigvIgZ1ULEQ&sig2=4XURX3hgwd1_FcldMO-zkA
>
>
>>I picked up some '70s era GE NEMA 1 magnetic contactors, NOS, military
>>spares. They have overload relays that accept heater inserts and are
>>adjustable within ±15% of nominal via a thumbwheel. Clearly the heater
>>inserts are literally just that - they heat the inside of the overload
>>relay. Beyond that, though, I'm stumped. I'm trying to figure out how
>>these overload relays work. Anyone know? The overload relay number is
>>CR124 if that helps.
>>
>>Grant
>>
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Posted via a free Usenet account from http://www.teranews.com
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Posted by Ignoramus17333 on January 26, 2008, 3:08 pm
Please log in for more thread options > Ah. Bimetallic strip. Makes sense. Doesn't explain how the thumbwheel works,
> but gives me a general idea.
probably adjusts tension on the strip
i
> Grant
>
> Ignoramus17333 wrote:
>
>>
http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.kilowattclassroom.com%2FArchive%2FMotorOL.pdf&ei=OY-bR7uzK4vOiAHm5uyNBw&usg=AFQjCNEz9b9BPs4tg_lJjAxigvIgZ1ULEQ&sig2=4XURX3hgwd1_FcldMO-zkA
>>
>>
>>>I picked up some '70s era GE NEMA 1 magnetic contactors, NOS, military
>>>spares. They have overload relays that accept heater inserts and are
>>>adjustable within ±15% of nominal via a thumbwheel. Clearly the heater
>>>inserts are literally just that - they heat the inside of the overload
>>>relay. Beyond that, though, I'm stumped. I'm trying to figure out how
>>>these overload relays work. Anyone know? The overload relay number is
>>>CR124 if that helps.
>>>
>>>Grant
>>>
>
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Posted by Gunner on January 27, 2008, 2:58 am
Please log in for more thread options On Sat, 26 Jan 2008 14:08:21 -0600, Ignoramus17333
>> Ah. Bimetallic strip. Makes sense. Doesn't explain how the thumbwheel works,
>> but gives me a general idea.
>
>probably adjusts tension on the strip
Correct. More tension, faster trip.
Gunner
>
>i
>
>> Grant
>>
>> Ignoramus17333 wrote:
>>
>>>
http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.kilowattclassroom.com%2FArchive%2FMotorOL.pdf&ei=OY-bR7uzK4vOiAHm5uyNBw&usg=AFQjCNEz9b9BPs4tg_lJjAxigvIgZ1ULEQ&sig2=4XURX3hgwd1_FcldMO-zkA
>>>
>>>
>>>>I picked up some '70s era GE NEMA 1 magnetic contactors, NOS, military
>>>>spares. They have overload relays that accept heater inserts and are
>>>>adjustable within ±15% of nominal via a thumbwheel. Clearly the heater
>>>>inserts are literally just that - they heat the inside of the overload
>>>>relay. Beyond that, though, I'm stumped. I'm trying to figure out how
>>>>these overload relays work. Anyone know? The overload relay number is
>>>>CR124 if that helps.
>>>>
>>>>Grant
>>>>
>>
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> spares. They have overload relays that accept heater inserts and are
> adjustable within ±15% of nominal via a thumbwheel. Clearly the heater
> inserts are literally just that - they heat the inside of the overload
> relay. Beyond that, though, I'm stumped. I'm trying to figure out how
> these overload relays work. Anyone know? The overload relay number is
> CR124 if that helps.
>
> Grant
>