1.50a 1800v dc surge protector fuse 2.supplier of Emerson, Delta,Eltek,Alpha 3. ... Description RT310 series fuse is for voltage sensitive resistor and surge protection fuse.Rated Voltage is from 690vac to 1800vac, or ... for telecom power protection-RT302 Fuse resistors-RT303 Fuse for surge protector and voltage sensitive device protection-RT310 c. why you ...