Circuit Protection Devices Pdf

A fuse is placed in an electrical circuit so tht when current flow exceeds the rating of the fuse it blows or blows out.

Circuit protection devices pdf.

Circuit protection devices protect expensive systems by rapidly disconnecting power to compon ents in the event of an ab normal operating condition. So sizing the ocpd logically comes before sizing the conductors. Discrimination with the higher level protection devices must be provided. It derives its name from the latin word fusus meaning to melt fuses have been used almost from the beginning of the use of electricity.

This is the area of the miniature circuit breaker these circuit breakers are designed to protect final distribution. Protection devices for electrical circuits accomplish two main functions namely consistency as well as protection. A weak short circuit current a few ka characterises this level. The residual current operated circuit breaker with integrated overcurrent protection is a protection device that combines the functionality of rccb and mcb and is used in residential xpole series as well as industrial xeffect series applications.

Protection is assured through detaching power supply in a circuit through overcurrent protection which removes fire hazards and electrocution additionally the accurate protection may be required to obey with organization principles for some products. But before you can size the ocpd you have to determine what load it will supply. Even though guidance exists in the form of the various electrical codes the wide variety of product offerings can make the proper selection of circuit protection devices a challenge. Circuit protection devices are available in a variety of types shapes and specific current ratings.

Let s start with looking at the order of the calculations. Fuses a fuse is the most common protection device. Circuit protection at its simplest is the intentional addition of a weak link in an electrical circuit. Zones of fusing and non.

This link will be broken in the event of a fault whether that s high temperature excessive current or a short circuit in a conductor thus protecting the electrical circuit it s part of from damage. Fuses a fuse is the simplest circuit protection device. The two types of circuit protection devices discussed in this chapter are fuses and circuit breakers. The protection devices are placed directly upstream of the loads.

For domestic and similar installation type gg for industrial installations type gg gm or am.