043802.5WRA Circuit Protection

043802.5WRA Application Field and Working Principle

043802.5WRA (or WRA) is a type of fuses, developed by the British Standard Institution (BSI) for use in medium-voltage electricity distribution networks. As its name implies, it is intended for indoor electrical fusing and is usually used in situations where an adequate self-protection or over-voltage protection is required.

The WRA has a rated current of 6 amps and a voltage rating of 500V. It is a general-purpose, box-type fuse which is designed to be used in a variety of applications, such as residential and commercial buildings, industrial factories and other places where a self-protection or over-voltage protection is needed against short circuits and over-load. It is also used in pilot protection applications where a large amount of current is required for the pilot relay circuit.

The WRA is a high-endurance-type fuse which is designed to provide reliable protection against over-current conditions. It is composed of a calibrated copper element that opens and closes in response to an appropriate voltage to protect the circuit against thermo-magnetic overloads. The WRA is designed to react fast and trip the fuse in less than 10 ms during an over-current situation.

When an over-current condition occurs in the circuit, the WRA acts as a circuit breaker and interrupts the current flow. The WRA is designed with an arc gap, a gap between its terminals which prevents the formation of an arc which may damage the fuse. This safety feature ensures that the fuse remains intact even after it has tripped, enabling it to be reset without having to replace it.

The WRA is a current limiting fuse which is designed to react faster and more efficiently in an over-current situation. It has a symmetrical time-current characteristic, allowing it to be used in all kinds of over-voltage situations and providing superior protection against damaging arc flashes. The WRA also has a high breaking capacity, meaning it can manage high fault currents and short-circuit situations with minimal risk of arc flash.

The WRA is a reliable and economical solution for industrial, commercial and residential fuse applications. Its quick response to over-current situations and its high breaking capacity make it an ideal choice for customers who need reliable, efficient protection for their electrical systems.