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1 Study the theoretical material on this topic.

2 Get acquainted with the technical features and study the design of circuit breakers, contactors and magnetic starters.

3 See the electronic circuits of the contactor and magnetic starter.

4 Inspect the contactors and magnetic starters on the laboratory panels.

5 To study the principle of the operation of circuit breakers, contactors and magnetic starters.

6 Create a report on laboratory work.

As a result of performing laboratory work, the student must:

- designation of knife switches, toggle switches, contactors and magnetic starters;

- the device and design features of knife switches,

toggle switches, contactors and magnetic starters;

- the principle of operation and use of switches, toggle switches, contactors and magnetic starters;

- types (their decoding) of switches, toggle switches, contactors and magnetic starters;

- Methods of suppression of the arc in the above-mentioned switching devices.

- use reference materials to determine technical features of these devices;

- work with computer programs to compile a report on laboratory work.

1 What is the purpose of the circuit breakers?

2 What currents can be turned off by the switch and under what conditions?

3 By what means is it possible to press the switch in the contacts?

4 What is the purpose of packet tumblers?

5 What is the purpose and application of contactors?

6 on what phenomenon is the principle of the action of contactors and magnetic starters based?

7 What is the purpose of the short-circuited coil on the contactor core and magnetic starters?

8 How is the contact resistance of the contacts maintained?

9 What is the purpose of the thermal relay?

10 How is the arc extinguished in the magnetic starters?

Subject: Investigation of the design, characteristics of circuit breakers and fuses.

- consolidation of theoretical knowledge on the topic "Electrical apparatus with voltage up to 1000 V";

- consolidation of the ability to work with technical literature; - development of logical thinking; - familiarization with new concepts and definitions;

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