BUCHHOLZ RELAY . type BF 80 250V, 2A IP 54 " EMB "
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The Buchholz relay is a protective unit to supervise liquid-insulated appliances with expansion vessel, such as transformers or choke coils. Design of the relay is such that it responds in the event of troubles inside of appliances to be protected. The type of relay to be used depends on nominal rating and construction features of appliance to be protected.