Switchgear and Fuses

You look it up on the sheet provided by the supplier for your switch gear. You wouldn't buy a car without looking at the specs. ALL solid blade and fuses are NON load break, unless they have a add-on. Use a breaker or OCR to do the dirty work.

Part two, of your question!! What are you on about?????

Relay range should be mated to your CB?????

Part three: I should guide you to a tech. school, a university or a good library. They still have libraries don't they?

1-read manufacturers datasheet.2-but about fuese it needs an experimental work.

warning: "this experiment should only be done by an expert person mentioning all conditions".

you need an adjustable current power supply ,an ampere meter and the fuse in a circuit ,by increasing current from 0 the fuse wire takes hot goes red and finally burns out ,if burning time equals to 5 second for fast or 20 seconds for slow type fuses we can roughly say :fuse rating then is about .4 times the mentioned current.

warning: "this experiment should only be done by an expert peson mentioning all conditions."