Which fuse is used in primary transformer?

Which fuse is used in primary transformer?

Fusetron Class RK5 and Low-Peak Class RK1 dual-element fuses can be sized on the transformer primary and/or secondary rated at 125% of the transformer F.L.A. These dual-element fuses have sufficient time- delay to withstand the high magnetizing inrush currents of transformers.

Why fuse is primary side of transformer?

The purpose of these fuses is to disconnect a faulty transformer from the secondary circuit. The size of the secondary fuse must be such that it will blow on a primary fault between its transformer and the associated primary fuse.

How do you determine the primary fuse size?

The primary fuses are sized as a % over the primary current in amps according to the chart below when secondary fusing is not used. Example. You have a 2KVA (2000 VA) transformer and your primary voltage is 460VAC and your secondary voltage is 120VAC. Primary Amps = VA/VAC = 2000/460 = 4.35 amps.

Why do transformers have fuses?

The sole purpose of a fuse is to blow in cases of short circuits (or when current exceeds the fuse rating). That said, fuses are used in a potential transformer circuit (Primary as well as Secondary) to protect from the PT’s winding faults and secondary circuit faults respectively.

What is the full meaning of J and P fuse?

Johnson & Phillips – High and Low Power Engineering Specialists.

Why does my transformer keep blowing?

A transformer can fail for a variety of reasons, but the most common causes include lightning strikes, overloading, wear and corrosion, power surges and moisture. Regardless of the cause, the result can be remarkable. Transformers contain mineral oil keeping the transformer cool.

Do I need a fuse for a transformer?

An individual primary fuse is not required if the primary circuit fuse is not greater than 300% of transformer primary current. 1. 500% for Motor Circuit Control Power Transformers.