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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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GE magnetic contactor?
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 -- Posted via a free Usenet account from http://www.teranews.com |
#2
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GE magnetic contactor?
http://www.google.com/url?sa=t&ct=re...wd1_FcldMO-zkA
On 2008-01-26, Grant Erwin wrote: 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 |
#3
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GE magnetic contactor?
On Jan 26, 11:42*am, Grant Erwin wrote:
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 -- Posted via a free Usenet account fromhttp://www.teranews.com A contactor and an overload relay together are called a starter. The heaters in the overload relay are interchangeable (to match the current requirements of the circuit), and are intended to heat either a bi-metalic element or a meltable metalic compound (later models may be fully electronic) which allows an internal switch (normally used to carry current through the contactor coil) to open which breaks the holding curcuit and allows the contactor points to seperate. dennis in nca |
#4
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GE magnetic contactor?
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=re...wd1_FcldMO-zkA On 2008-01-26, Grant Erwin wrote: 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 -- Posted via a free Usenet account from http://www.teranews.com |
#5
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GE magnetic contactor?
On 2008-01-26, Grant Erwin wrote:
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=re...wd1_FcldMO-zkA On 2008-01-26, Grant Erwin wrote: 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 |
#6
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GE magnetic contactor?
On Jan 26, 11:42*am, Grant Erwin wrote:
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 -- Posted via a free Usenet account fromhttp://www.teranews.com A little latching bar sits on the thumb wheel to hole the points closed... When the strip heats up from to much current it releases the thumb wheel letting it spin letting the latch fall off the wheel letting the points come open... |
#7
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GE magnetic contactor?
On Sat, 26 Jan 2008 14:08:21 -0600, Ignoramus17333
wrote: On 2008-01-26, Grant Erwin wrote: 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=re...wd1_FcldMO-zkA On 2008-01-26, Grant Erwin wrote: 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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