Dual-element time-delay fuses

Time-delay fuses can provide overload and short circuit protection while overcoming momentary current spikes. They are used for the protection of motors and transformers. The time-delay characteristics of these fuses typically allow them to be sized closer to the running rated full load current of the loads. Time-delay fuses are also known as slow-blown fuses … Read more

Top 5 differences between MCB and RCCB

RCCB stands for Residual current circuit breakers and MCB stands for Miniature circuit breakers. Both of them are basic circuit protection devices found in the distribution boards of every house and commercial lighting power distribution boards. Here are the differences between MCB and RCCB. RCCB – Residual Current Circuit Breakers Residual current circuit breakers are … Read more

Difference between fuse and MCB

Circuit protection devices such as fuses and MCBs are used to safeguard any equipment from damages caused due to short circuits. The usage of these devices does not mitigate the chances of occurrence of a fault. But can help us prevent the undesirable aftermaths of the electrical faults. This article is about the difference between … Read more

What is kA rating (breaking capacity) of MCB and MCCB?

kA rating of an MCB or an MCCB is the maximum current it can safely interrupt in case of a short circuit. If the current goes beyond this value, the circuit breaker could be damaged. kA rating is known as the short circuit withstand capacity or ultimate breaking capacity of a circuit breaker. For example, … Read more

What is an MCB?

MCB stands for miniature circuit breaker. It is a circuit protection device, capable of protecting a circuit or a piece of equipment from greater damages caused due to short circuits as well as overloads. It is a modular device and can be used as an alternative to fuses. It is capable of sensing overload and … Read more

Difference between over-current and overload

Over-current and overload are abnormal conditions occurring in a circuit. This article well explains the difference between over-current and overload. Difference between over-current and overload Over-current Any situation in which the current flow through a device or conductor exceeds the desired value is known as over current. Both overload and short circuit can cause excessive … Read more

Difference between Short circuit and overload

Short Circuit A short circuit occurs when two or more current-carrying conductors of different phases or different voltage levels or different terminal (in DC circuits) come in contact with each other or with the ground. It is an abnormal condition during which current shoots up several times the permissible limits. Read about short circuits in … Read more

Miniature circuit breaker (MCB) – Principle of operation

Miniature circuit breakers commonly known as MCB, are mechanically operated switches cum circuit protection devices. It is an electro-mechanically operated automatic circuit protection device and is used to interrupt a circuit during overload and short circuits. It can be used as an alternative to fuses for domestic applications. They can be reused even after the … Read more

Difference between MCB, MCCB, RCCB, RCBO and Isolator

Introduction Circuit breakers are safety devices, which ensures the safety of equipment and personnel from electric shocks and damages. They are self-acting and should safely interrupt the current flow on the event of faults. Circuit breakers are a cost-effective and efficient alternative to traditional circuit protection fuses. These devices are reusable and may help in … Read more

MCB Trip Curves – B, C, D, K, and Z trip curves

MCB (Miniature circuit breaker) is a re-settable device designed to protect a circuit from short circuits and overcurrents. The trip curve of an MCB (B, C, D, K, and Z curves) tells us about the trip current rating of Miniature Circuit breakers. The trip current rating is the minimum current at which the MCB will … Read more