Posted: Tue Aug 08, 2006 5:01 pm Post subject: Circuit Breakers
Did the M38 change to 25 amp circuit breakers?
I just got some new ones in today packaged in Sept 1951 that are 25 amp. P/N 7526902, MFG.# C 9115-2-25.
I only see one listing for circuit breakers in the parts manual which has P/N 7760416, MFG# C9115-2-15.
Should I use the 25 amp breakers or send them back? _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM
Ryan it was my thinking that the breakers were originally 15 amp. I can't rememer if I was told that or what.
My jeep didn't have any breakers so I don't know for sure.
I thought the current carrying capacity of 14 ga. wire is 15 amps. The wire might stand more than that though, but the circuit breakers function is to protect the wire from burning out so stay under the rating some.
I would say a 25amp breaker would be to protect a 10ga wire from burning out. However I don't have have the facts, but would like to know.
As usual I'm probably all wrong. _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM
15 amp originally and no record of any change to larger which would have of course necessitated a wiring change. Those are probably for a vehicle that carried heavier electrical loads.
Did the 25 ampers have Douglas or Packard connectors? _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Wes the breakers have Douglas connectors. A double and a single. I'll have to call the man and tell him I need 15 ampere breakers. But I suppose he should have known to send those. Maybe an oversight. _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM
15 amp Douglas connectors CB's are tough to find. I found a great set at Fall Willys gathering in Jefferson City two years ago and went and set them down while taking photos and of course they got legs and dissappeared. If they were actually stolen then I sincerely hope they failed and the turkey's jeep burned to the ground.
If this guy has the real thing in 15 amp and they are priced on this planet let me know.
One word of caution, old CB's can be a real problem if you don't test them and they fail to open when they are suppose to. Weather they are old used or old NOS makes no difference. test them with a load bank or DC regulated power supply. If you don't have the test equipment take them to your auto electric repair shop. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Great I guess I should have known they would be scarce. I would rather have the correct rating breaker even if it were the packard connector.
I have three used breakers. One is packard with single connectors and the other two are douglas with single connections on both. One of the breakers has 5 ohm's of resistance across the contacts. So right off the bat I believe it is flaky. _________________ Tropical Veteran
35th Inf. Reg. "CACTI" 4th I.D. VN
Amateur Radio K5XOM
Ken, the late M series Packard connector CB's are easy to convert and are readily available. The manufacturer still sells these CB's for the late Packard connectors.
This 15 amp late CB is available a Saturn Surplus for Military Vehicle Circuit Breaker - 15A M13512/1-1 5935-00-026-4767 $12.50 Y-14
Military Vehicle Circuit Breaker - 15 AMP
Brand New!! Military Vehicle Circuit Breaker - 15 AMP. Part Number: M13516/1-1, NSN: 5935-00-026-4767. Simple 1-in, 1-out hook up with the standard Rubber Connectors as previously advertised. Simple 2-bolt mounting.
Klixon® 9115 Series (Waterproof)
15 to 30 Amp Precision, Ignition Protected Thermal Breakers
Updated June 26, 2006
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Ignition protected
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Waterproof: meets the requirements of MIL-E-13856
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Meets requirements of commercial item description A-A-55571 for all federal agencies
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Reliable performance: utilizes the accepted snap–acting Klixon disc
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Maximum cable efficiency: calibration and thermal disc allow maximum usage of wiring capacity
In addition to a completely sealed thermal element, the 9115-5 (automatic reset) and 9115-6 (manual reset) types also have molded–in electrical terminals and are supplied with rubber connectors (shells).
Performance
Characteristics
Calibration
At 25°C (77°F) hold 115% and trip 138%
High Potential Test
1000 volts rms — 60Hz for 1 minute
Vibration Resistance
1055 cps 1.52 (.060") excursion for 3 hours
Shock Resistance
100G, 30 times per MIL-STD-202
Corrosion Resistance
100 hours per MIL-STD-202
Fungi Resistance
Per specification MIL-F-13927
Waterproof
Per specification MIL-STD-1184
Dustproof
Per specification MIL-STD-810
Approximate Weight
6.3 grams (2.25oz)
Applications
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Completely waterproof electrical systems of ordinance vehicles
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Mobile military ground equipment, including trucks, tractors, graders, earth movers, fuel units and amphibious, as well as commercial, vehicles
General Envelope Dimensions
Nominal dimensions provided for reference only.
Views of 9115 circuit breaker
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Thermal Circuit Breakers
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Trip Curve
Approximate Time — Current Characteristics at 77°F (25°C)
Trip Curve Diagram
Derating Curve
Approximate Effect of Ambient Temperature on Ultimate Trip
Diagram: Approximate effect of ambient temperature on ultimate trip
Performance characteristics are based on room temperature (77°F). Consult derating curve at left for ambient temperatures significantly higher or lower than standard room temperature.
Example: At 77°F the device is calibrated to hold at 110% of rated current (1) and trip at 138% of rated current (2). At 140°F, the same device will hold at approximately 92% of rated current (3), and trip at approximately 120% of rated current (4).
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