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Fuse size and type for 230V / 110V transformer

Tom D

Can someone confirm if in place of FUSE 1 ca be used 25A RCBO Type D and in place of FUSE 2 16A MCB Type C  please?

Wall mounted transformer is 3.3kVA 230V/110V as per the below snapshot. 

Will 4mm2 singles H07 be fine on the primary and secondary side of the transformer if we don't consider any major voltage drop?

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  • 0

    More info needed.

    Do you have the datasheet for the transformer, and if so what does it say about inrush - are inrush limiters built in, is it E-I core or toroidal ? (toroids use less wire and have  lower loss but much more of switch-on thump)

    3.3KVA implies that with 25A inlet MCB there is scope to overload, so does it have thermal trips built in that give protection against that ? Also is that 3.3 KVA rating 24/7 or with some duty cycle ?

    Generally the choice of load side MCBs will be more to do with expected loads, but for 'anything reasonable' 16A C type is a good start.

    Mike

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  • 0

    More info needed.

    Do you have the datasheet for the transformer, and if so what does it say about inrush - are inrush limiters built in, is it E-I core or toroidal ? (toroids use less wire and have  lower loss but much more of switch-on thump)

    3.3KVA implies that with 25A inlet MCB there is scope to overload, so does it have thermal trips built in that give protection against that ? Also is that 3.3 KVA rating 24/7 or with some duty cycle ?

    Generally the choice of load side MCBs will be more to do with expected loads, but for 'anything reasonable' 16A C type is a good start.

    Mike

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