The basics of device circuit breakers | Differences between the technologies
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10000
1000
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0,5 ... 6 A |
8 ... 16 A |
10000
1000
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0,5 ... 6 A |
8 ... 16 A |
10000
1000
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0,5 ... 6 A |
8 ... 16 A |
Switching time [ s ] |
100
10
1
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Switching time [ s ] |
100
10
1
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Switching time [ s ] |
100
10
1
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0,1 |
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0,1 |
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0,1 |
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0,01 |
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0,01 |
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0,01 |
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0,001 1 2 4 610 20 40 100 2 4 610 20 40 100 Multiples of IN |
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0,001 1 2 4 610 20 40 100 2 4 610 20 40 100 Multiples of IN
AC tripping range
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0,001 1 2 4 610 20 40 100 2 4 610 20 40 100 Multiples of IN |
Fig . 12 : SFB characteristic curve Fig . 13 : M1 characteristic curve
Fig . 14 : F1 characteristic curve
2.3 Electronic circuit breakers
Electronic circuit breakers are generally used in conjunction with 24 V DC switched-mode power supply units . They are frequently used in machine and ship building , systems manufacturing , and automation technology . A combination of current analysis and rapid tripping in the event of a fault prevents the danger of a switched-mode power supply unit overload . The output voltage remains in
Microcontroller
MOSFET
Voltage regulator
Fig . 15 : Structure of a multichannel electronic circuit breaker
place at the switched-mode power supply unit and all other circuits can continue to operate . These circuit breakers are ideal for protecting things like relays , programmable controllers , motors , sensors and actuators , and valves . Combining electronic circuit breakers with a synchronized power supply can increase the availability of systems and machines .
Suppressor diode
Buttons
Backup fuse
Function description The heart of an electronic circuit breaker is its semiconductor electronics ( Fig . 15 ), which nowadays is generally assisted by intelligent software . The software differentiates between operating currents and damaging currents and transmits commands to the electronic system extremely rapidly . This is because it has to ensure that faults are detected and shut down as quickly as possible while not shutting off an inrush current or normal operating current .
The fault detection process passes through the following steps :
• Measurement : All electrical variables are measured continuously in order to monitor the ongoing situation .
• Analysis : The measured values are analyzed to determine whether a fault has occurred .
• Classification : The currents are evaluated and classified .
• Protect and switch : Depending on the class of the analyzed current , the load is started or shut down . The rest of the system remains in operation and unaffected .
• Signaling : The operating states of all circuits are transmitted continuously to the superordinate
PhoENix CoNtACt 13