Protective devices are used to maintain the primary function by means such as bringing in standby equipment when the main equipment fails or to provide protection in relation to secondary functions such as safety or environment.
What are the examples of protective device?
Electrical Protective Device – Types of Protective Device
- Fuse Wire or Fuse.
- MCB – Miniature circuit breaker.
- ELCB – Earth Leakage Circuit Breaker.
- ELCB & MCB.
- Earthing or Grounding.
What is the use of protective devices?
Protective devices are important because they ensure that under fault conditions, a high fault current cannot flow – as well as protecting the installation this, more importantly, ensures that consumers are not injured or killed as a result of an electrical fault.
What are the main features of a protective device?
Protective Device Characteristics
- Fuse Characteristics.
- Relay Characteristics.
- Power Circuit Breakers.
- Automatic Circuit Reclosers.
- Automatic Line Sectionalizers.
- Circuit Switchers.
- Digital Fault Recorders.
What are four types of overcurrent protective devices?
Any one of four overcurrent protective devices can be used as the short-circuit and ground-fault protecting device: Nontime Delay Fuses, Dual Element (Time Delay) Fuses, Instantaneous Trip Breakers, or Inverse Time Breakers.
How does an overcurrent device work?
An overcurrent protection device protects the circuit by opening the device when the current reaches a value that will cause an excessive or dangerous temperature rise in conductors. Most overcurrent protection devices respond to both, short-circuit or ground-fault current values as well as overload conditions.