茗熔集团有限公司

Guidance for H.V. fuses selection

Rated voltage of H.V.Fuses		Rated current of H.V. Fuses.
H.V.fuses selected should be of a rated voltage matchable to power voltage The rated voltage of fuses used in 3-phase circuit should be chosen according to the wire voltage.； The rated voltage of fuses used in single-phase circuit should be of 115% of max.phase voltage. When the H.V. fuse links are installed into 3-phase circuit,better choice is to select fuses according to Max.wire voltage.		The fuse element has a rated current less than That of fuse link. The rated current of fuse should be 1.25 times of operating current of loads. Devaluation should be considered when the fuses are fixed in a 3-phase sealed or unsealed cabinet, or in an insulating cast canister.
		Breaking capacity
		The max.breaking capacity of fuses should be no less than max.short-circuit current of the protected circuit.The min.melting current should be less than the min,short-circuit current of the protected circuit.

Storage of H.V. Fuses		Installation and replacement.
·The fuses should be kept in a dry place. Give fuses being fallen or seriously shocked a careful examination before use it Recheck the resistance of fuses which has been kept for A long time before selling.		Make sure that all the spare parts are tightly fixed when Installation to avoid its overheating when operation. When one of three fuses installed in 3-phase circuit acted. the other two also should be replaced. The replacement of an acted fuses,should be done in 10 minutes after its action.Under such circumstance as smock leakage,noise from the fuse after its action,the fuse can be replaced only after it is out of the circuit. More consideration on safely should be taken when the replacement is done to fuses installed near power Supply equipments or electrified conductor. The fuses can not be installed in a dusty,polluted,humid place.
Transpotation of fuses.
Try to avoid the fuses from shocking,falling-down and impact,if such things happened,do test it thoroughly before its being used. Notes before ordering: The user should have a clear picture about its rated voltage,rated current,breaking current and protecting objects. Please feel free to contact us for your special