Amp Fused Disconnect
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 Square D H327N 800 Amp 240 Volt Fused Disconnect  US $2,400.00
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 Square D H367 800 Amp 600 Volt Fused Disconnect US $2,200.00
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 GE 800 Amp NEMA 1 Fused QMR Disconnect DIS1735 US $2,000.00
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 siemens allis 15kv disconnect switch fused 600 amps US $1,800.00
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 ITE FR356 1 600 Amp 600 Volt Fused Nema 3R Disconnect US $1,800.00
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 SQUARE D 400 AMP FUSED DISCONNECT 4 POLE 2 PHASE H425 US $1,750.00
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 Murray HH426N 400 Amp 240 Volt Fused Disconnect US $1,400.00
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 Westinghouse HFN366 600 Amp 600 Volt Fused Disconnect US $1,300.00
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 ITE F356 600 Amp 600 Volt Fused Disconnect US $1,300.00
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 SQD Square D H 362 DX 60 Amp Fused Disconnect US $1,160.00
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 Siemens HF365 400 Amp 600 Volt Fused Disconnect US $1,100.00
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 GE Stainless THN3364SS 200 amp Non Fused Safety Disconnect Switch US $1,098.00
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 Cutler Hammer DH365NGK 400 Amp 600 Volt Fused Disconnect US $1,080.00
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 Cutler Hammer DH325NGK 400 Amp 240 Volt Fused Disconnect US $1,049.00
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 SQD Square D H361DX 30 Amp Fused Disconnect US $1,045.00
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 Siemens HF325N 400 Amp 240 Volt Fused Disconnect US $1,020.00
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 Crouse Hinds GH426N 600 Amp 240 Volt Fused Disconnect US $1,000.00
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 Westinghouse HU366 600 Amp 600 Volt Non Fused Disconnect US $1,000.00
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 Cutler Hammer 4105H2305H 400 Amp 240 Volt Fused Nema 12 Disconnect US $1,000.00
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 Square D H325N 400 Amp 240 Volt Fused Disconnect US $1,000.00
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 Siemens GF325N 400 Amp Fused Disconnect US $1,000.00
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 ITE Siemens SN426 600 Amp Fused Disconnect US $1,000.00
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 Square D H365 400 Amp 600 Volt Fused Disconnect US $979.00
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 ITE Siemens F321SS 30 Amp Fused Stainless Disconnect US $960.00
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 SQD Square D HU365N 400 Amp Non Fused Disconnect US $835.00
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 CH Westinghouse GFN425N 400 Amp Fused Disconnect US $825.00
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 Square D H366 600amp Fused Disconnect US $825.00
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 H364DS SQUARE D Fused Disconnect 200 Amp 600V 3P 4W US $800.00
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 MOTOROLA 1200 AMP FUSED DISCONNECT US $800.00
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 SQUARE D 400 AMP outdoor rated 600 Volt H365R Fused Disconnect Switch 3 phase US $800.00
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 SQD Square D HU361 DX 30 Amp Non Fused Disconnect US $795.00
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 CH Cutler Hammer DH365UGK 400 Amp Non Fused Disconnect US $790.00
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 CH 4105H4461H 4 30 Amp 600 Volt Fused Nema 4 Disconnect US $750.00
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 Square D HU366 600amp 600v non fused disconnect switch US $675.00
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 Square D D325N 400 Amp 240 Volt Fused Disconnect US $650.00
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 GE 400 Amp NEMA 1 Fused Disconnect DIS1733 US $650.00
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 ITE F222H 60 Amp 240 Volt Fused Nema 12 Disconnect US $630.00
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 Siemens HF364 200 Amp 600 Volt 3 Pole Fused Disconnect US $600.00
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 Westinghouse GF425N 400 Amp 240 Volt Fused Disconnect US $600.00
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What would cause a 200 Amp fuse corrosion in a 200 Amp fused disconnect?
Fuses have started corrosion after only a year. no chemicals present, no moisture, no nothing. It could be dissimaliar metals but I doubt it. Should I just add an oxide compound or is there a heat issue I need to be concerned with>?
Also plain old oxidation. Certain metals when exposed to air form oxides on their contacts which are high impedance's thus resulting in an open connection. If you can, check what types of metals are used for contacts. When you say no moisture, is the fuse and its contacts in some type of vacuum? The contacts have to be exposed to the outside at some point so they will be exposed to humidity and temp changes.
As was already posted, clean the surfaces with a metal brush and/or an acidic solution (i.e. a sodium hydroxide etchant) and apply some oxide compound like you mentioned or some conductive grease. My $0.02
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