relays,switch,solenoid
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Relays, Switches, Safety Devices
6 February 2004
Switches, Fuses and Relays
Schematic Symbols for Switches and Fuses
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
2
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Relays, Switches, Safety Devices
6 February 2004
Switches
6 February 2004
Relays, Switches, Safety Devices
3
Cutaway View of a SPDT Toggle Switch
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
4
2
Relays, Switches, Safety Devices
6 February 2004
Standard Switch vs Three Way Switch
6 February 2004
Relays, Switches, Safety Devices
5
Three Way Switch Connection
SPDT
6 February 2004
Professor Andrew H. Andersen
SPST
Relays, Switches, Safety Devices
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3
Relays, Switches, Safety Devices
6 February 2004
Fuses and Circuit Breakers
6 February 2004
Relays, Switches, Safety Devices
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Three Wire Grounded Systems
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
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4
Relays, Switches, Safety Devices
6 February 2004
Grounding in Electrical Systems
6 February 2004
Relays, Switches, Safety Devices
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Wire Gauge
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
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5
Relays, Switches, Safety Devices
6 February 2004
Electromagnetism and Electromagnetic Fields • Electromagnetism is the production of a magnetic field by current in a conductor • Electromagnets are used in devices such as tape recorders, electric motors, speakers, solenoids, and relays • When current passes through a conductor, an electromagnetic field is created around the conductor – Magnetic field is stronger close to the conductor
6 February 2004
Relays, Switches, Safety Devices
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Direction of Lines of Force • The direction of the lines of force surrounding a conductor depend upon the direction of current flow • The left-hand rule is used to determine the direction of the lines of force (for electron flow) • If the conductor is grasped in the left hand, with the thumb pointing in the direction of electron current flow, the fingers of the left hand point in the direction of the magnetic lines of force
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
12
6
Relays, Switches, Safety Devices
6 February 2004
Magnetic Switch in Burglar Alarm
6 February 2004
Relays, Switches, Safety Devices
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Operation of a Magnetic Switch
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
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7
Relays, Switches, Safety Devices
6 February 2004
Solenoid
6 February 2004
Relays, Switches, Safety Devices
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Operation of a Solenoid
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
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8
Relays, Switches, Safety Devices
6 February 2004
Relay
6 February 2004
Relays, Switches, Safety Devices
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SPDT Relay
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
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9
Relays, Switches, Safety Devices
6 February 2004
Reed Relay
6 February 2004
Professor Andrew H. Andersen
Relays, Switches, Safety Devices
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10
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