Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Types of Tripping Protection in MCCB
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Electrical Basics > Types of Tripping Protection in MCCB

Types of Tripping Protection in MCCB

In this article, you will learn the Moulded Case Circuit Breaker (MCCB) types of tripping protection and their explanation.

Last updated: September 28, 2022 4:07 pm
Viral Nagda
Electrical Basics
No Comments
Share
6 Min Read
SHARE

In this post, we will see the various types of tripping protection features available in an MCCB.

Contents
MCCB Tripping ProtectionLong Time Delay Short Time Pick Up and DelayContinuous Amps Ground Fault Pick-up and Delay Instantaneous Pick-up

Circuit breakers are an essential part of an electrical circuit. It is a device that is used as a protective switch for passing electrical current with tripping conditions checked.

When it detects a trip condition, the circuit breaker opens its contact and isolates the input and output voltage from contacting each other.

Many types of circuit breakers are used in a circuit; but in this post, we will focus on one of the most used ones – MCCB (Moulded Case Circuit Breaker).

MCCB Tripping Protection

Now, here, we will see the many tripping functions that are available in MCCB. Basically, the idea is to understand the various settings through which an MCCB can trip the circuit.

This is one of the main advantages of MCCB over other circuit breakers; because you have many options to protect the whole electrical circuit by manipulating the settings according to you.

Types of Tripping Protection in MCCB

Let us have a look at each one of them.

Long Time Delay

As the name defines, the long time delay is the setting that shows how long a circuit breaker can carry the over current before tripping the circuit.

It defines the maximum tolerable capacity of the MCCB to carry a huge amount of over current that is potentially dangerous for the circuit if carried for a longer time.

Many electrical loads have a high amount of inrush current too when it is started. If the circuit is not allowed to pass this current for some period of time and it trips immediately, then it will never run in the system.

So, it is essential to provide some time for the load to carry this current; but up to a permissible limit. This limit is a long time delay.

The maximum allowable over current rating available as of now is up to 6 times the rated current. Time is settable normally from 2 to 30 seconds.

 Short Time Pick Up and Delay

As the name defines, the short time delay is the setting that shows how long a circuit breaker can carry the over current before tripping the circuit. The working is the same as long time delay; it is just shorter than long time delay.

A short time delay allows a more amount of over current to pass through the circuit breaker. Time is settable normally from 0.05 to 0.5 seconds.

Short-time pickup is the current set in the circuit breaker which defines the maximum allowable over current.

Typically, it is up to 10 times the rated current.

Continuous Amps

With this setting, you can change the rated current of the circuit breaker.

Typically, the setting is adjusted from 20 to 100%. This means, suppose you set the rating to 60%; and the rated ampere is 1000A.

So, the circuit breaker can carry 600A of current properly without tripping. If it exceeds 600A, then it will trip.

 Ground Fault Pick-up and Delay

There are many systems where grounding is not proper and if such high impedance currents are not detected, then it can damage the equipment.

So, this setting allows the circuit breaker to limit the ground fault current up to a limit for a certain period of time. If the time is exceeded, then the circuit breaker will trip.

Normally, the time is divided into three parts – 0.1 seconds, 0.2 seconds, and 0.4 seconds.

The pickup is normally set from 20 to 70% of breaker rating.

 Instantaneous Pick-up

As the name defines, instantaneous pick up is the setting that shows how high a circuit breaker can carry the over current before immediately tripping the circuit. There is no time delay in this.

As soon as the current exceeds the limit, the circuit breaker trips instantaneously. If this setting is set even lower than short time pick up and the current exceeds the instantaneous pickup limit, then it will override the short time delay and trip the circuit immediately.

In this way, we discussed various types of tripping protections that are available in an MCCB.

If you liked this article, then please subscribe to our YouTube Channel for Instrumentation, Electrical, PLC, and SCADA video tutorials.

You can also follow us on Facebook and Twitter to receive daily updates.

Read Next:

  • Earth Leakage Circuit Breaker
  • Corona Discharge in Power Lines
  • Star Delta Starter Circuit Diagrams
  • Control Two Motors after Time Delay
  • Thermal Protection Relay for Motors
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Pros and Cons of Soft Starter
What is Electrical Busbar? Types, Advantages, Disadvantages
How to Identify Phase, Earth, and Neutral Wires?
Why Do We Need to Connect Transformers in Parallel?
Difference Between NEMA and IEC Motors?
Electrical Feeder Automation in Smart Grid
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Basics of Electricity Rates
What is an Electrical Drive? Types, Advantages, Disadvantages
Difference Between Short Circuit and Ground Fault
UPS Working Principle and Types – Offline and Online UPS Systems
Difference between Servo Motor and DC Motor
Difference Between Earth and Neutral
Why Three-phase Voltage is 440 Volts?
Basics of Star and Delta connections

Keep Learning

Difference Between AA and AAA Batteries

Difference Between AA and AAA Batteries

Difference Between Alternator and Generator

Difference Between Alternator and Generator?

Wiring Diagram Forward-Reverse for 3 Phase Motor

Motor Forward and Reverse Direction Control using Limit Switches

Difference Between Circuit Breaker and Fuse

Difference Between Circuit Breaker and Fuse

What is an ELV System - Extra Low Voltage

What is an ELV System? – Extra Low Voltage

LCS Configuration equipped with LOTO Facility

Motor Control Signal Interface

Safety Tips When Working With Electricity

Safety Tips When Working With Electricity

Lithium-ion Battery Charging System

Lithium-ion Battery Charging Systems

Learn More

Transformer Tap changer

Ferroresonance in Power Transformers

liquid flow control system

Practical Process Control System Questions & Answers – 7

What happen When Synchronous Generator loss Excitation

Motor Maintenance

Motor Maintenance, Troubles, Regular Checks, Performance

compressor emergency shutdown system

Compressor Emergency Shutdown Root Cause Analysis

Flame Cables

Difference Between Flame Resistant and Flame Retardant Cables

limit-switch-works

How Limit Switch Works ?

Coil Type Timers in Siemens PLC Programming

Coil Type Timers in Siemens PLC Programming

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?