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What Is A Relay? Used To Protect The Electrical System and To Minimize The Damage To The Equipment Due To Over Currents/voltages

The document outlines the author's motivation to become an Electro-Technical Officer, highlighting their passion for advanced electrical systems and the appeal of working in a global maritime environment. It explains the function and working principle of relays, emphasizing their role in protecting electrical systems and their operation through electromagnetic induction. Additionally, it describes Molded Case Circuit Breakers (MCCB), detailing their use in low voltage circuits and their advanced features compared to miniature circuit breakers.

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xavier mokhtar
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6 views2 pages

What Is A Relay? Used To Protect The Electrical System and To Minimize The Damage To The Equipment Due To Over Currents/voltages

The document outlines the author's motivation to become an Electro-Technical Officer, highlighting their passion for advanced electrical systems and the appeal of working in a global maritime environment. It explains the function and working principle of relays, emphasizing their role in protecting electrical systems and their operation through electromagnetic induction. Additionally, it describes Molded Case Circuit Breakers (MCCB), detailing their use in low voltage circuits and their advanced features compared to miniature circuit breakers.

Uploaded by

xavier mokhtar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Why do you want to become an ETO?

I want to become an Electro-Technical Officer because I’m passionate about working


with advanced electrical systems and solving complex technical challenges. The role offers a
perfect blend of hands-on work and continuous learning, which aligns with my career goals.
Additionally, the opportunity to work in a global environment and contribute to the safety and
efficiency of maritime operations makes this role particularly appealing to me.
What is a relay?
Relays are used to protect the electrical system and to minimize the damage to the equipment
connected in the system due to over currents/voltages. The relay is used for the purpose of
protection of the equipment connected with it.

Electromechanical switch. Relay is also a switch that connects or disconnects two


circuits. But instead of a manual operation, a relay uses an electrical signal to control an
electromagnet, which in turn connects or disconnects another circuit.
Every electromechanical relay consists of an consists of an

1. Electromagnet
2. Mechanically movable contact
3. Switching points and
4. Spring
Relay Working Principle
 Relay works on the principle of electromagnetic induction.
 When the electromagnet is applied with some current, it induces a magnetic field
around it.
 Above image shows working of the relay. A switch is used to apply DC current to the
load.
 In the relay, Copper coil and the iron core acts as electromagnet.
 When the coil is applied with DC current, it starts attracting the contact as shown. This is
called energizing of relay.
 When the supply is removed it retrieves back to the original position. This is called De
energizing of relay.
What is MCCB?
Molded Case Circuit Breaker uses air as the dielectric medium to break a circuit.
Air has a low dielectric strength as opposed to other mediums that is why it is used for
protection in low voltage circuits/distribution system. protects the circuit from
overloading, short circuit and current surges. It is an advanced version of miniature
circuit breaker MCB since it operates like one. However, it offers extra features that make
it a superior circuit breaker such as remote closing and adjustable trip settings i.e. its
current settings and time settings can be adjusted according to our needs. It is available
in rating up to 2500 Amps and 1.1 kV.

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