Recommend Fuse rating for Kelinginc KL- 7212

[spaceballs_3000]

I like to add an fuse to the power supply.

Any Fuse rating recommendations for Kelinginc KL- 7212 powersupply? Note I'll be using 120vac.

KL- 7212 powersupply spec, unregulated Power Supply 860W, 72VDC/12A, Single Rectifier Module,120VAC or 230VAC.

Thanks.

[rgammage]

Hello

I assume you mean a fuse on the input side. That given, the fuse needs to be larger than
860 (watts) / 120v (your input volts) which gives 7.2 Amps. Most power supplies take more current at switch on ( known as inrush current) and also you do not want the fuse to blow regularly. I would fit an 8 Amp Slo-blow fuse (if you can get them) or a 10 normal fuse.

A Slo-Blow fuse will not blow for several seconds at start up even if the current is several times the rating but will blow in several minutes if current is taken at the rated current. Similar to a thermal trip which you mich also like to check out.

I hope this helps

Richard

[spaceballs_3000]

Originally Posted by rgammage Hello I assume you mean a fuse on the input side. That given, the fuse needs to be larger than 860 (watts) / 120v (your input volts) which gives 7.2 Amps. Most power supplies take more current at switch on ( known as inrush current) and also you do not want the fuse to blow regularly. I would fit an 8 Amp Slo-blow fuse (if you can get them) or a 10 normal fuse. A Slo-Blow fuse will not blow for several seconds at start up even if the current is several times the rating but will blow in several minutes if current is taken at the rated current. Similar to a thermal trip which you mich also like to check out. I hope this helps Richard

That give me a good idea of what I need to do now.
Thanks Richard!