MindMap Gallery Electrical switch appliances mind map
This is a mind map about factory electrical control technology, including knife switches, Combination Switch, Low voltage circuit breaker, etc.
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This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
Switch electrical appliances
Knife switch
effect
Connected in series with a fuse to form a load switch with short circuit protection capability
The load switch can switch on and off small working current lighting equipment and small power motors for infrequent operation, open and closed types
Function
Infrequent manual connection, disconnection of circuit, power isolation switch
Classification
Number of poles
Unipolar
bipolar
Three poles
Conversion method
single bet
double throw
Operation method
Direct handle operation
Remote linkage operation
Arc extinguishing method
existence and cessation
Indestructible
Open load switch
effect
Zhaoming
AC 38Ov/220v, rated I<10OA
Start switch
Control motors below 5.5Kw
Select requirements
Lighting and electric heating loads
Rated voltage 220v or 25OV
Rated current <The circuit has a two-pole switch with load rated current and
Responsible for controlling the motor
1. Consider the starting current of the motor
2. Three-pole switch rated 330v or 500v, rated current ≥ 3 times the rated current of the motor
symbol
Closed load switch
Scope of application
Rated voltage AC 380v/DC 440, rated current 66A,
Manually connect and disconnect load circuits infrequently
Short circuit protection
Controlling small capacity AC asynchronous motors
Combination Switch
Features
Many contact points
Compact structure and flexible wiring
Easy to operate
Scope of application
AC 220v or DC 220v or less
effect
power introduction switch
Control the start, stop, forward and reverse rotation and speed control switch of small capacity motors below 5KW
The rated current of start, stop and switch should be 1.5~2.5 times of the rated current of the motor.
Low voltage circuit breaker
effect
Automatically cut off the power supply for protection
Features
Operational safety
Easy to install
Action parameters are adjustable
High breaking capacity
Multiple protection functions, no need to replace components after operation
symbol
P10 Change s to F and draw a low vertical line ✘
structure
Electric shock and arc extinguishing systems
Realize the on-and-off components of the circuit
Protective release
Thermal tripper
The line is overloaded and the current flowing through the heating element in series with the main circuit increases.
The setting current is equal to the rated current of the control motor or the rated current of the load.
Overcurrent release
Circuit short circuit or failure
The set current is greater than the peak current of the load during normal operation.
Motor load is set at 1.7 times the starting current
Undervoltage release
When the grid voltage is too low or 0, parallel connection is generally used.
Equal to the rated voltage of the main circuit
Shunt tripper
Realize remote control of circuit breaker breaking function
Free release mechanism and operating mechanism
Classification
control method
Manual
Direct manual
Leverage
Breaking large current
use
distribution network
Selectivity
non-choice
For motor protection
for lighting
Leakage protection circuit breaker
Current limiting performance
No current limit
Limiting
Number of poles
Single, two, three, four
Technical parameters/Commonly used low voltage circuit breakers
Book p12/13
Choose to use
The rated voltage and rated voltage are not less than the normal working current and voltage.