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Questions tagged [circuit-breaker]

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1answer
612 views

Expected breaker temperature on a 208V 30A circuit with continuous 80% load

I have several cabinets of servers in a datacenter and each of these cabinets is on a dedicated 208V 30A circuit. The load on each of these circuits is 24A and one circuit is slightly higher (~24.6A). ...
5
votes
6answers
17k views

Does a circuit breaker trip depending on voltage or current?

I've have a GE 120V 20A circuit breaker. I'm aware that once it exceeds the 20A rating the breaker does its job and trips, but what happens if the current is less than 20A and the voltage lets says ...
0
votes
1answer
120 views

Why is MCCB 1000Vdc for photovoltaic?

I want to install MCCB for 750Vdc supply in traction application (Light Rail Transit). After finding some 750Vdc MCCBs, I looked for 1000Vdc MCCBs. All the 1000Vdc MCCBs are intended for photovoltaic ...
1
vote
1answer
586 views

How to prevent PV input to charge controller if battery breaker trips

I have a 20amp mppt charge controller (EP Solar tracer 20a). In the manual it states: WARNING: Connect battery terminals to the charge controller BEFORE connecting the solar panel(s) to the ...
0
votes
1answer
366 views

Solid state circuit breakers

I'm trying to design a Solid state circuit breaker for a 3phase AC system with a rating of 690V, 1000A. As, the stray inductance contributes to the voltage peaks in the system I'm trying to protect ...
0
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3answers
1k views

Residential MCB vs. Industrial MCB

Are there differences between residential circuit breaker and industrial circuit breaker? When I browse through various online catalogs on circuit breaker, ABB and Schneider Electrics are often ...
1
vote
6answers
4k views

Why Circuit Breaker has neutral and no ground?

My understanding is circuit breaker only need to trip when the hot end current jumps up (e.g. short circuit), but I have seen circuit breaker has dual (two) poles with both red cable and blue cable ...
-1
votes
1answer
440 views

Is it necessary to use 4-pole circuit breaker for TN-C-S system?

It seems that in TN-C-S system is necessary to use 4-pole circuit breaker, I want to know it's correct or not? and if it's correct, which document or standard is used to prove it?
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votes
2answers
639 views

Using motor circuit breaker buttons to start/stop motor

I want to add some protection to an ac 3/4 hp motor. I did some research and found that I could use one of these motor circuit breakers: My question is, if I use one of these, can I use the on/off ...
0
votes
3answers
2k views

Proper setting of a magnetic trip breaker

I have separate interrupting devices in an MCC bucket. One is a magnetic trip-overload 250A breaker, where the lowest trip setting is 1100A. The other is an electronic device that has 3 CT's and ...
0
votes
1answer
107 views

Working house main Control Miniature Circuit Breaker(25A) instead of transfuse (16A)?

I have two Miniature Circuit Breaker, so one is ordinary main Miniature Circuit Breaker(house main MCB) in range of 25A and the other is my device (Auto-Transformer) in range of 16A, So when i run ...
0
votes
1answer
300 views

Optimal Breaker Configuration for Split Phase Mains Power

First, let me preface this by saying this is entirely theoretical. I don't plan to install anything myself, and I'll contract a licensed electrician to do any of this work, so please don't feel the ...
0
votes
1answer
324 views

Circuit breaker not tripping

I am powering a bunch of LEDs with a 60A/5V power supply. For extra protection, I wired a 50A circuit breaker between the supply and the LED array: http://www.digikey.com/product-search/en?mpart=W23-...
0
votes
3answers
470 views

What happens if there was a short circuit fault BEFORE the main circuit breaker?

I haven't studied power systems yet but i keep wondering about that. What would happen if there was a short circuit fault BEFORE the main circuit breaker(on the grid itself)? what protction is ...
1
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3answers
1k views

Circuit breaker automatic switcher [closed]

I have a circuit breaker for my house as this one: Each time we turn on 3 ACs , the breaker turns the current off and I have to lift the circuit breaker switch which is far down stairs in my ...