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Where to connect the fuse and why?
what size of copper wire can act as a 150A fuse?How to keep circuit powered when battery disconnected for short timeAutomotive power supply - considerations for selecting fuseWill battery drain if only positive terminal connected to circuit?Using a dc power supply instead of batteriesOne power supply, two loads, fuses and current sense+ and - 12 V power supply with 12v Batteries, How to make a ground rail with both batteriesRemotely monitor condition of fuseHow to fuse batteries connected in parallel?Do I need to fuse batteries in parallel?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
I am currently going through the conundrum of where to place a fuse in my DC battery-powered circuit to protect the circuit components and the DC battery. I've been googling for a definitive answer but I came across diverging opinions... Which one is correct and why?
- Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
- Connect the fuse to the positive terminal.
- Connect 2 fuses, one at the positive and one at the negative battery terminals.
Also, during my research, I came across a post that advised to connect a fuse at the positive terminal since it would protect both circuit and the battery, but if the fuse is connected to the negative battery terminal, then it only protects the battery. Is this true? It doesn't make sense to me.
So, I can't figure out which one is correct and why? I made a simple block diagram to illustrate my question.
So, is it position A or B? Or both? And why?
battery-operated fuses
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
$endgroup$
add a comment |
$begingroup$
I am currently going through the conundrum of where to place a fuse in my DC battery-powered circuit to protect the circuit components and the DC battery. I've been googling for a definitive answer but I came across diverging opinions... Which one is correct and why?
- Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
- Connect the fuse to the positive terminal.
- Connect 2 fuses, one at the positive and one at the negative battery terminals.
Also, during my research, I came across a post that advised to connect a fuse at the positive terminal since it would protect both circuit and the battery, but if the fuse is connected to the negative battery terminal, then it only protects the battery. Is this true? It doesn't make sense to me.
So, I can't figure out which one is correct and why? I made a simple block diagram to illustrate my question.
So, is it position A or B? Or both? And why?
battery-operated fuses
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
$endgroup$
$begingroup$
If the frame is connected to the negative terminal of the battery (like in cars), you need to put the fuse in postion A. If there is a short circuit to frame, the current may pass by the fuse in position B.
$endgroup$
– Huisman
8 hours ago
$begingroup$
What bad event are you trying to protect from? What part of the circuit might fail? That should tell you where to put the fuse.
$endgroup$
– Elliot Alderson
8 hours ago
$begingroup$
if you are really concerned about the health of the battery, then use two fuses, one on each battery terminal
$endgroup$
– jsotola
8 hours ago
add a comment |
$begingroup$
I am currently going through the conundrum of where to place a fuse in my DC battery-powered circuit to protect the circuit components and the DC battery. I've been googling for a definitive answer but I came across diverging opinions... Which one is correct and why?
- Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
- Connect the fuse to the positive terminal.
- Connect 2 fuses, one at the positive and one at the negative battery terminals.
Also, during my research, I came across a post that advised to connect a fuse at the positive terminal since it would protect both circuit and the battery, but if the fuse is connected to the negative battery terminal, then it only protects the battery. Is this true? It doesn't make sense to me.
So, I can't figure out which one is correct and why? I made a simple block diagram to illustrate my question.
So, is it position A or B? Or both? And why?
battery-operated fuses
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
$endgroup$
I am currently going through the conundrum of where to place a fuse in my DC battery-powered circuit to protect the circuit components and the DC battery. I've been googling for a definitive answer but I came across diverging opinions... Which one is correct and why?
- Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
- Connect the fuse to the positive terminal.
- Connect 2 fuses, one at the positive and one at the negative battery terminals.
Also, during my research, I came across a post that advised to connect a fuse at the positive terminal since it would protect both circuit and the battery, but if the fuse is connected to the negative battery terminal, then it only protects the battery. Is this true? It doesn't make sense to me.
So, I can't figure out which one is correct and why? I made a simple block diagram to illustrate my question.
So, is it position A or B? Or both? And why?
battery-operated fuses
battery-operated fuses
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
edited 8 hours ago
JYelton
16.6k28 gold badges94 silver badges195 bronze badges
16.6k28 gold badges94 silver badges195 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
asked 9 hours ago
WiredMakerWiredMaker
408 bronze badges
408 bronze badges
$begingroup$
If the frame is connected to the negative terminal of the battery (like in cars), you need to put the fuse in postion A. If there is a short circuit to frame, the current may pass by the fuse in position B.
$endgroup$
– Huisman
8 hours ago
$begingroup$
What bad event are you trying to protect from? What part of the circuit might fail? That should tell you where to put the fuse.
$endgroup$
– Elliot Alderson
8 hours ago
$begingroup$
if you are really concerned about the health of the battery, then use two fuses, one on each battery terminal
$endgroup$
– jsotola
8 hours ago
add a comment |
$begingroup$
If the frame is connected to the negative terminal of the battery (like in cars), you need to put the fuse in postion A. If there is a short circuit to frame, the current may pass by the fuse in position B.
$endgroup$
– Huisman
8 hours ago
$begingroup$
What bad event are you trying to protect from? What part of the circuit might fail? That should tell you where to put the fuse.
$endgroup$
– Elliot Alderson
8 hours ago
$begingroup$
if you are really concerned about the health of the battery, then use two fuses, one on each battery terminal
$endgroup$
– jsotola
8 hours ago
$begingroup$
If the frame is connected to the negative terminal of the battery (like in cars), you need to put the fuse in postion A. If there is a short circuit to frame, the current may pass by the fuse in position B.
$endgroup$
– Huisman
8 hours ago
$begingroup$
If the frame is connected to the negative terminal of the battery (like in cars), you need to put the fuse in postion A. If there is a short circuit to frame, the current may pass by the fuse in position B.
$endgroup$
– Huisman
8 hours ago
$begingroup$
What bad event are you trying to protect from? What part of the circuit might fail? That should tell you where to put the fuse.
$endgroup$
– Elliot Alderson
8 hours ago
$begingroup$
What bad event are you trying to protect from? What part of the circuit might fail? That should tell you where to put the fuse.
$endgroup$
– Elliot Alderson
8 hours ago
$begingroup$
if you are really concerned about the health of the battery, then use two fuses, one on each battery terminal
$endgroup$
– jsotola
8 hours ago
$begingroup$
if you are really concerned about the health of the battery, then use two fuses, one on each battery terminal
$endgroup$
– jsotola
8 hours ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
Forget about electron flow. It only causes confusion such as in your thinking. Electrical current flows in a circuit in the same way that a bicycle chain flows around. Any mobile charge carriers that leave one terminal of the power source must return on the other. A break anywhere will stop current flow.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Four possible scenarios.
- Figures 1a and 1b are equivalent. If F1 or F2 blows then current flow will cease. As the power supply has no ground / earth / chassis connection there is no danger of a single fault causing an alternate return path.
- Figure 1c is the way most vehicles are wired with a negative connection to the chassis. The fuses are placed in the positive lines from the battery and close to the battery. If a fault occurs on the line between the fuse and the load the fuse blows and current flow stops. A ground fault on the return line is unlikely to cause any problems as there is no significant voltage on it.
- Figure 1d shows a poor arrangement with the fuse in the return wire. It should be clear that a ground fault on the positive wire would be unprotected, F4 would not blow but BAT4 would pass high currents.
Again, for circuit analysis it is normal to use the conventional current flow from positive to negative. Don't worry about electrons, just think of it as charge moving from + to -.
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
$endgroup$
add a comment |
$begingroup$
Since the negative terminal of the battery is normally considered "Ground" or "Zero Volts", a fuse in the negative lead would leave the rest of the circuit "hot" - usually Not a Good Thing.
Recommended practice is to place the fuse near the positive terminal of the battery, so the whole circuit will be dead if the fuse blows.
(Of course, if the positive terminal is considered Ground, place the fuse near the negative terminal.)
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
$endgroup$
add a comment |
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2 Answers
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active
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2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
Forget about electron flow. It only causes confusion such as in your thinking. Electrical current flows in a circuit in the same way that a bicycle chain flows around. Any mobile charge carriers that leave one terminal of the power source must return on the other. A break anywhere will stop current flow.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Four possible scenarios.
- Figures 1a and 1b are equivalent. If F1 or F2 blows then current flow will cease. As the power supply has no ground / earth / chassis connection there is no danger of a single fault causing an alternate return path.
- Figure 1c is the way most vehicles are wired with a negative connection to the chassis. The fuses are placed in the positive lines from the battery and close to the battery. If a fault occurs on the line between the fuse and the load the fuse blows and current flow stops. A ground fault on the return line is unlikely to cause any problems as there is no significant voltage on it.
- Figure 1d shows a poor arrangement with the fuse in the return wire. It should be clear that a ground fault on the positive wire would be unprotected, F4 would not blow but BAT4 would pass high currents.
Again, for circuit analysis it is normal to use the conventional current flow from positive to negative. Don't worry about electrons, just think of it as charge moving from + to -.
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
$endgroup$
add a comment |
$begingroup$
Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
Forget about electron flow. It only causes confusion such as in your thinking. Electrical current flows in a circuit in the same way that a bicycle chain flows around. Any mobile charge carriers that leave one terminal of the power source must return on the other. A break anywhere will stop current flow.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Four possible scenarios.
- Figures 1a and 1b are equivalent. If F1 or F2 blows then current flow will cease. As the power supply has no ground / earth / chassis connection there is no danger of a single fault causing an alternate return path.
- Figure 1c is the way most vehicles are wired with a negative connection to the chassis. The fuses are placed in the positive lines from the battery and close to the battery. If a fault occurs on the line between the fuse and the load the fuse blows and current flow stops. A ground fault on the return line is unlikely to cause any problems as there is no significant voltage on it.
- Figure 1d shows a poor arrangement with the fuse in the return wire. It should be clear that a ground fault on the positive wire would be unprotected, F4 would not blow but BAT4 would pass high currents.
Again, for circuit analysis it is normal to use the conventional current flow from positive to negative. Don't worry about electrons, just think of it as charge moving from + to -.
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
$endgroup$
add a comment |
$begingroup$
Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
Forget about electron flow. It only causes confusion such as in your thinking. Electrical current flows in a circuit in the same way that a bicycle chain flows around. Any mobile charge carriers that leave one terminal of the power source must return on the other. A break anywhere will stop current flow.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Four possible scenarios.
- Figures 1a and 1b are equivalent. If F1 or F2 blows then current flow will cease. As the power supply has no ground / earth / chassis connection there is no danger of a single fault causing an alternate return path.
- Figure 1c is the way most vehicles are wired with a negative connection to the chassis. The fuses are placed in the positive lines from the battery and close to the battery. If a fault occurs on the line between the fuse and the load the fuse blows and current flow stops. A ground fault on the return line is unlikely to cause any problems as there is no significant voltage on it.
- Figure 1d shows a poor arrangement with the fuse in the return wire. It should be clear that a ground fault on the positive wire would be unprotected, F4 would not blow but BAT4 would pass high currents.
Again, for circuit analysis it is normal to use the conventional current flow from positive to negative. Don't worry about electrons, just think of it as charge moving from + to -.
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
$endgroup$
Connect the fuse to the negative terminal of the battery since it's where the actual flow of electrons originate which is opposite to the conventional flow of current from the positive terminal.
Forget about electron flow. It only causes confusion such as in your thinking. Electrical current flows in a circuit in the same way that a bicycle chain flows around. Any mobile charge carriers that leave one terminal of the power source must return on the other. A break anywhere will stop current flow.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Four possible scenarios.
- Figures 1a and 1b are equivalent. If F1 or F2 blows then current flow will cease. As the power supply has no ground / earth / chassis connection there is no danger of a single fault causing an alternate return path.
- Figure 1c is the way most vehicles are wired with a negative connection to the chassis. The fuses are placed in the positive lines from the battery and close to the battery. If a fault occurs on the line between the fuse and the load the fuse blows and current flow stops. A ground fault on the return line is unlikely to cause any problems as there is no significant voltage on it.
- Figure 1d shows a poor arrangement with the fuse in the return wire. It should be clear that a ground fault on the positive wire would be unprotected, F4 would not blow but BAT4 would pass high currents.
Again, for circuit analysis it is normal to use the conventional current flow from positive to negative. Don't worry about electrons, just think of it as charge moving from + to -.
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
answered 8 hours ago
TransistorTransistor
93.6k7 gold badges92 silver badges205 bronze badges
93.6k7 gold badges92 silver badges205 bronze badges
add a comment |
add a comment |
$begingroup$
Since the negative terminal of the battery is normally considered "Ground" or "Zero Volts", a fuse in the negative lead would leave the rest of the circuit "hot" - usually Not a Good Thing.
Recommended practice is to place the fuse near the positive terminal of the battery, so the whole circuit will be dead if the fuse blows.
(Of course, if the positive terminal is considered Ground, place the fuse near the negative terminal.)
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
$endgroup$
add a comment |
$begingroup$
Since the negative terminal of the battery is normally considered "Ground" or "Zero Volts", a fuse in the negative lead would leave the rest of the circuit "hot" - usually Not a Good Thing.
Recommended practice is to place the fuse near the positive terminal of the battery, so the whole circuit will be dead if the fuse blows.
(Of course, if the positive terminal is considered Ground, place the fuse near the negative terminal.)
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
$endgroup$
add a comment |
$begingroup$
Since the negative terminal of the battery is normally considered "Ground" or "Zero Volts", a fuse in the negative lead would leave the rest of the circuit "hot" - usually Not a Good Thing.
Recommended practice is to place the fuse near the positive terminal of the battery, so the whole circuit will be dead if the fuse blows.
(Of course, if the positive terminal is considered Ground, place the fuse near the negative terminal.)
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
$endgroup$
Since the negative terminal of the battery is normally considered "Ground" or "Zero Volts", a fuse in the negative lead would leave the rest of the circuit "hot" - usually Not a Good Thing.
Recommended practice is to place the fuse near the positive terminal of the battery, so the whole circuit will be dead if the fuse blows.
(Of course, if the positive terminal is considered Ground, place the fuse near the negative terminal.)
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
answered 8 hours ago
Peter BennettPeter Bennett
38.7k1 gold badge31 silver badges70 bronze badges
38.7k1 gold badge31 silver badges70 bronze badges
add a comment |
add a comment |
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$begingroup$
If the frame is connected to the negative terminal of the battery (like in cars), you need to put the fuse in postion A. If there is a short circuit to frame, the current may pass by the fuse in position B.
$endgroup$
– Huisman
8 hours ago
$begingroup$
What bad event are you trying to protect from? What part of the circuit might fail? That should tell you where to put the fuse.
$endgroup$
– Elliot Alderson
8 hours ago
$begingroup$
if you are really concerned about the health of the battery, then use two fuses, one on each battery terminal
$endgroup$
– jsotola
8 hours ago