To All,
I was disassembling a PL700 recently ("tear down" and "gutting" are such strong words). I noticed a broken fuse holder and examined the item very carefully for the first time. These are the well-known Buss devices. Cooper Industries was an American worldwide electrical products manufacturer headquartered in Houston, Texas. Founded in 1833, the company had seven operating divisions including Bussmann electrical and electronic fuses. Doing research, it appears Cooper was acquired by Eaton in 2012. So these are now Eaton Bussmann fuse holders.
Mine are marked "HJM" which is an obsolete P/N. Interestingly, all five of these fuse holders are only rated at 5A and 125V and the length supports the fast-acting AGX length fuse at 1/4" x 1". The replacement is P/N HKP, a 15A 250V part designed for the AGC 1/4" x 1 1/4" length fuses. Although you can cram an AGC fuse in an AGX fuse holder, this is a lot of spring pressure because the inner plunger is too long for the AGC fuse.
Of course, the newer fuse holders have plastic securing nuts, so save the metal nuts from your old fuse holders. The metal nuts are an optional part, but I could not find a P/N. HKP is found at Mouser by P/N 504-HKP at $5.74. The black washer is Mouser P/N 504-BK/9732.
The HKP fuse holder also comes with many P/N descriptors (from Mouser):
HKP-H-R
HKP-CC-R
HKP-W-R
HKP-BBHH-R
I know the "R" on the end stands for RoHS compliant, I cannot find what any of the other descriptors stand for.
As for the fuses, Watts Abundant pointed out that 125V AGC fuses are only rated for 10A, then the voltage decreases to 32V. That's OK for the Rails but not the Line. The better solution for a Line fuse is the fast-acting ABC fuse, but they are ceramic, not glass, for the higher voltage/current flashover.
I will use the new HKP fuse holder for the line fuse because it is rated at 15A. I have not measured the individual rail supplies current draw, but it might be close to 5A at full power levels (and DC current is a different flavor than AC current, no?). Possibly, Phase Linear used a 5A Buss fuse holder to save money? Not sure.
Thoughts?
I was disassembling a PL700 recently ("tear down" and "gutting" are such strong words). I noticed a broken fuse holder and examined the item very carefully for the first time. These are the well-known Buss devices. Cooper Industries was an American worldwide electrical products manufacturer headquartered in Houston, Texas. Founded in 1833, the company had seven operating divisions including Bussmann electrical and electronic fuses. Doing research, it appears Cooper was acquired by Eaton in 2012. So these are now Eaton Bussmann fuse holders.
Mine are marked "HJM" which is an obsolete P/N. Interestingly, all five of these fuse holders are only rated at 5A and 125V and the length supports the fast-acting AGX length fuse at 1/4" x 1". The replacement is P/N HKP, a 15A 250V part designed for the AGC 1/4" x 1 1/4" length fuses. Although you can cram an AGC fuse in an AGX fuse holder, this is a lot of spring pressure because the inner plunger is too long for the AGC fuse.
Of course, the newer fuse holders have plastic securing nuts, so save the metal nuts from your old fuse holders. The metal nuts are an optional part, but I could not find a P/N. HKP is found at Mouser by P/N 504-HKP at $5.74. The black washer is Mouser P/N 504-BK/9732.
The HKP fuse holder also comes with many P/N descriptors (from Mouser):
HKP-H-R
HKP-CC-R
HKP-W-R
HKP-BBHH-R
I know the "R" on the end stands for RoHS compliant, I cannot find what any of the other descriptors stand for.
As for the fuses, Watts Abundant pointed out that 125V AGC fuses are only rated for 10A, then the voltage decreases to 32V. That's OK for the Rails but not the Line. The better solution for a Line fuse is the fast-acting ABC fuse, but they are ceramic, not glass, for the higher voltage/current flashover.
I will use the new HKP fuse holder for the line fuse because it is rated at 15A. I have not measured the individual rail supplies current draw, but it might be close to 5A at full power levels (and DC current is a different flavor than AC current, no?). Possibly, Phase Linear used a 5A Buss fuse holder to save money? Not sure.
Thoughts?