H.V. HRC Current-Limiting Fuses type O for Motor Protection

Applications

Oil H.V HRC current-limiting fuses type O for transformer protection is mainly used in AC 50Hz, rated voltage 3.6-24kV, rated current200A(3.6kV), 160A(7.2kV), 125A(12kV) and below circuit for protecting transformers and power equipment’s from overload and short-circuit.
• It conforms to IEC282-1, BS, DIN and GB1566.2.

Design Features

• O type H.V HRC current-limiting fuses have two installations: Bus-bar installation and insert installation, It is small in volume, reliable in convenient in install and removal. The striker parallels to the fuse element make from pure silver. They are sealed in the fuse tube filled with chemically treated high-purity quartz sand. The fuse tube is made from heat resistant, high duty ceramic or epoxy glass. When fault circuit happens, the fuse link melts. At the appearance of the arc the high-resistant metal wire paralleling to fuse links melts immediately, which lights the powder and caused high pressure pushing the striker jumps out to push the chained equipment contact, signaling the melting or automatically cutting the circuit.
• O type H.V HRC current-limiting fuses are featured with high sealing property, low power consume, high breaking capacity, quick and punctual action, reliable performance.

Mode And Implication

Basic Data

Models	Ratedvoltage (KV)	Rated current of the fuse links(A)	Rated breakingcurrent (KA)	Dimensions (mm) Figure 1~2	Weight (Kg)
				L
OEFMA	3.6	6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200	50	254	1.9
OEFMA	7.2	80, 100, 112	50	254	1.9
OHGMA	7.2	100, 125, 140,160	50	359	2.6
OEFMA	12	6.3, 10, 16, 20, 25, 31.5, 40, 50, 63	40	254	1.9
OHGMA	12	71, 80	40	254	1.9
OHGMA	12	6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125	40	359	2.6
OEGMA	24	6.3, 10, 16, 20, 25, 31.5, 40, 50, 63	25	359	2.6
OFGMD	12	63, 80, 100, 125	40	359	4.0
OKGMD	12	160, 200	40	359	4.0

Note: Under stipulated conditions, min.breaking current could be as high as 2.5~5 times than rated current.

Dimensions

Characteristics Curve