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A switch fuse is a load-breaking isolator combined with fuse protection. It allows safe manual isolation of a circuit while providing overcurrent and short-circuit protection via a replaceable fuse link. Most switch fuses use BS 88 or NH fuse links, offering very high fault-current protection compared to many resettable devices.
Switch fuses are commonly used for:
Electricians are often faced with the decision of whether to use a switch fuse or an MCB. While both provide overcurrent protection, their suitability depends on the installation context.
Switch fuses use sacrificial fuse links, whereas MCBs are resettable thermal-magnetic devices. Fuse links can interrupt extremely high fault currents safely, making them ideal for sub-mains and commercial supplies.
Understanding coordination and selectivity ensures circuits disconnect safely without unnecessary outages.