Timeline for Three phase heaters and amps

Current License: CC BY-SA 3.0

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Nov 13 '13 at 8:50 comment added david @Dave Tweed A 25 Amp switch is rated to switch 25 Ampere under specified conditions. If it doesn't, it's a bad switch. That does not mean it is rated to carry 25 Ampere under any other particular condition: that's not the way high current switches are normally described. It's very unlikely you can get specific information for any particular situation other than the exact switch specification. For all other loads, you should start with a margin.
Nov 12 '13 at 18:42 comment added Dave Tweed It's all a question of where the design margins are allocated. If a manufacturer of 25A switches had them failing regularly at 24A, he probably wouldn't stay in business very long. Therefore, he's going to make sure his switches have an actual capacity in excess of 25A to begin with, in order to cover the statistical distribution from manufacturing tolerances, test equipment calibration, aging, etc. So it comes down to how much you trust the manufacturer and how much additional margin you want to build into your product.
Nov 12 '13 at 18:00 history answered Olin Lathrop CC BY-SA 3.0