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Couple of questions on switching voltages and fuse values
Old 16th August 2007
  #1
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Couple of questions on switching voltages and fuse values

I’ve just taken delivery of an API A2D. I’m hoping that someone can help me with a couple of questions regarding AC power and fuse values.

1. The A2D has a sliding switch to select between 115 volts and 230 volts. Here in Australia, we run a 240 volt AC electricity grid. Here’s my question: after setting the unit’s selector switch to 230 volts, is it OK to supply it with 240 volts?

2 Regarding the fuse: should the value of the fuse be dependent on the amount of AC voltage? That is, can you run the same fuse regardless of whether you’re supplying it with 115 volts or 230/240 volts?? I’ve checked the manual on this, and it’s not quite clear. It says “Only replace with the proper fuse for the appropriate AC input” – it provides no other info. On the back of the A2D itself, printed below the fuse holder, is the following “T 0.5A/0.25A 250V”. Cue the Bill Cosby “Noah” sketch……. “RIIIIIIIGHT”.

Cheers.
Old 16th August 2007
  #2
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220 volts, 230, 240 -- no appreciable difference same setting.

Generally, line fuse values that are rated for 120 volts can he halved when a unit is used at 220/230/240 volts. It sounds like you need a T (time delay) .25 amp fuse.
Old 16th August 2007
  #3
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David - thanks a bunch. thumbsup
Old 16th August 2007
  #4
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Just when you think Australia has become entrenched as a member of the First World....

I can't find a retailer in town who stocks a 250 milliamp slow blow 250 volt fuse. The unit came with a 500 milliamp fuse fitted. Am I risking damage to the unit by running it on 240 volts with the 500 milliamp fuse fitted??

Thanks.
Old 16th August 2007
  #5
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I wouldn't worry about it. Use the 500 ma fuse temporarily and order a 250 ma, should be fine.
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