Comparison of HRC Fuses and Circuit Breaker | Electronicsinfos

Comparison of HRC Fuses and Circuit Breaker

What is HRC Fuse?

HRC Fuse is a High Rupturing Capacity Fuse that protects the System from faults.

HRC Fuses 

1. HRC Fuses possess higher rupturing Capacity in the medium voltage Range. Fuses Of Rupturing Capacity is 75 MVA are available.
2. HRC Fuses are Cheaper.
3. HRC fuses take up less space.
4. HRC Fuses are Simple to Install and Maintain.
5. In the case of Severe Faults, the HRC Fuse opens a circuit in less than half a cycle.
6. There is no deterioration in the case of HRC fuses.
7. Less Maintenance except periodic tightening of connection. 
8. Extreme Reliability 
9. Coordination and discrimination to a high degree.
10. Closer Control on sustained overloads due to low fusing factor and the time lag feature.
11. Current Limitation by Cut-off Property. During severe faults, an HRC fuse opens the circuit before the peak of the prospective fault current is reached, thus protecting the equipment against maximum thermal and dynamic stress.

What is a Circuit Breaker?

A circuit breaker is a mechanical switching device designed to automatically open a circuit under specified abnormal conditions without injury to itself.

Circuit Breaker

1. Circuit breakers possess lower and too bulky rupturing Capacity in the medium voltage Range. The Minimum rupturing capacity is 250MVa for 11 kV and 350MVA for 33 kV is recommended. 
2. Circuit breakers are expensive compared to fuses.
3. Circuit breakers take up more space compared to fuse.
4. Circuit breakers are hard to Install and Maintain.
5. In the case of Severe Faults, Circuit breakers open a circuit in more than 2-3 cycles.
6. Circuit breakers are prone to become sluggish in operation with laps of time. The Worn latches, contacts etc can cause maloperation of the circuit breaker.
7. A Circuit breaker may use air or oil as the arc quenching medium and may have one or more poles.

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