I have a 220V AC to 24V AC transformer rated at 2Amps. What size of Primary and Secondary fuse should I use?
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1\$\begingroup\$ What is the nature of the load you are protecting? Do you need slow-blow type fuses for inrush current tolerance? The fuse value is usually selected such that it allows for a small percentage more than the load will pull. \$\endgroup\$– JYeltonCommented Apr 15, 2020 at 5:37
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\$\begingroup\$ The transformer will drive 4 x valve actuators for a swimming pool (the manufacturer has not supplied the rating of the valves). They however are certainly well with the 2 amp maximum of the transformer and I doubt that there is any high initial demand. \$\endgroup\$– RadialCommented Apr 15, 2020 at 6:37
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\$\begingroup\$ What are your fuses trying to protect? \$\endgroup\$– Andy akaCommented Apr 15, 2020 at 8:45
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\$\begingroup\$ Generally need slow-blow for transformer input fuses due to inrush, otherwise you end up with an over-large fuse that can't protect the transformer. \$\endgroup\$– Neil_UKCommented Apr 15, 2020 at 9:48
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1 Answer
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slow-blow 2A on the output, fuses take a very long time to blow at there rating, so this is mainly to protect against hard shorts,
If you're not pulling near the rating at any time, then conventional 2A
Mains input fuse depends on the quality of the transformer, plan for 0.5A, as cheaper transformers consume some current while doing nothing.
