MCB - bticino

Circuit Breakers
Submitted by:
Al-shaimaa Mohamed Mahmoud
Eman Mohamed Lithy
Huda Yahia Ekram

Contents
• Introduction
• Components
• Types
• Process
• Final product

INTRODUCTION
A circuit breaker is an
automatically operate
electrical switch designed to
protect an electrical
circuit from damage caused
by overcurrent or over
load or short circuit.

Types of CB
• Air CB (MCB “Miniature circuit breaker”)
• Vacuum CB
• SF6 CB
• Oil CB
In bticino MCB is manufactured

MCB’s process in bticino
• Magnetic components assembling
• Thermal components assembling
• Assembling
• Testing
• Finishing

Magnetic components
‫الدليل‬
•‫بالستيك‬
•‫سوستة‬
•‫ثابت‬ ‫قلب‬
•‫متحرك‬ ‫قلب‬
•pins

Magnetic components
Assembling
• Coil
• Frame
• ‫دليل‬

Magnetic components
‫اللحام‬
•‫ال‬ ‫لحام‬frame‫ال‬ ‫مع‬coil
•‫ال‬ ‫مع‬ ‫الترملة‬ ‫لحام‬frame
When the current pass
the “‫”دليل‬ moves so the
pin moves and the
switch becomes off

Magnetic components
Finally…
Dimensions of the coil and the color of the “ “‫دليل‬ change
with change of Ampere

• Braided wire
Braided wires are better conductors than solid wires.
Braided wires do not break easily when flexed.
• Bimetal

•‫كونتاكت‬ ‫موبيل‬

•‫ترملة‬
‫للتوصيل‬ ‫طرف‬

•‫شرارة‬ ‫موجه‬
‫لل‬ ‫الشرارة‬ ‫لتوجيه‬metal chutes

Pins
‫و‬ ‫قفل‬ ‫وحامل‬ ‫قفل‬pin

How it works
When overload happens, higher current passes through the
braided wire, the heating effect of current heats up the bi-
metal until the tripping point is reached causes the bi-metal
to bend which pulls the U-part which in turn pulls the lever
of the switch …the breaker trips.

Testing (Calibration Room)
Magnetic Test
• Range
• Testing (okay
OR Aperto)

Testing (Calibration Room)
Thermal Test
Two Processes :
• Calibration: To make
sure of Bimetal’s
position
• Verification: To make
sure of thermal parts
The Two types of range
are exist in a range
paper

Finishing
‫التشميع‬
•‫بالتشميع‬ ‫المعايرة‬ ‫مسمار‬ ‫ربط‬ ‫يتم‬

Finishing
‫المسامير‬ ‫تشميع‬
There are two types
High Ampere:
‫يتم‬‫ال‬ ‫الن‬ ‫المسامير‬ ‫بواسطة‬ ‫البرشمة‬‫برشمة‬
‫ا‬ ‫التيارات‬ ‫تستحمل‬ ‫لن‬ ‫بالبالستيك‬‫لعالية‬
Low Ampere:
‫البالستيك‬ ‫برشمة‬ ‫يتم‬

Finishing
final stage
For High Ampere:
‫تركيب‬ ‫يتم‬‫السدادة‬

Finishing
final stage
‫الهواء‬ ‫مفك‬
•‫دف‬ ‫يتم‬ ‫والصغير‬ ‫العالى‬ ‫لالمبير‬‫ع‬
‫نزول‬ ‫ليتم‬ ‫المفك‬ ‫خالل‬ ‫من‬ ‫الهواء‬
‫الترملة‬
•‫التركيب‬ ‫لسهولة‬

Finishing
final stage
‫والجرار‬ ‫الباغة‬
•‫العالى‬ ‫لالمبير‬:‫ا‬ ‫تركيب‬ ‫يتم‬‫لباغة‬
‫السدادة‬ ‫على‬
•‫يتم‬ ‫والعالى‬ ‫الصغير‬ ‫لالمبير‬
‫الجرار‬ ‫تركيب‬
‫الجرار‬ ‫كبس‬ ‫يتم‬ ‫ثم‬

Finishing
final stage
•‫اكلشيه‬
•‫باركود‬
•‫تعبئة‬

MCB - bticino

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