Eaton's Bussmann series oil tight medium voltage fuses are designed for use in oil filled switchgear. They are suitable for primary side transformer protection and oil filled switch combination unit. This type of fuses was pioneered in the UK. Eaton has been in continuous manufacture for almost 40 years being by far one of the most widely used device of its kind in the world. Over 1 million of Eaton's Bussmann series oil tight medium voltage fuses have been put in service.