# Questions tagged [automatic-circuit-breaker]

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### What factors play into choosing type of MCB (Circuit Breaker) which is B16 vs C16 vs D16?

Found these discussions and Q&As online around this and am trying to determine how/ when one would decide to choose which way to go? http://www.theiet.org/forums/forum/messageview.cfm?catid=205&...
2k views

### First order circuit with t=0+ , t=0-?

Yesterday I tried to solve a question in a second order circuit , but I couldn't ! because I have problem understanding the concept of 0+ , 0- ! So let me try it in a first order circuit , it ...
118 views

### Finding some variables in a second-order circuit?

Can any one please help me solving these questions .. I always get a wrong answers :/ The first order circuit is much easier than this one !! This is my answer : for the first time i thought it ...
338 views

### How to select a home automatic circuit breaker?

A room contains electrical devices which has a max demand of 10A (may be more than that in the future). The mains cable from the electric panel (distribution board) is 4 mm2 which can handle current ...
293 views

### Should a frequency-controlled motor use a circuit breaker with a B or C trip characteristic?

In our company, a discussion is raging on whether a motor with a frequency controller should be protected with an automatic circuit breaker with B or C characteristic. The B-camp's argument is that, ...
75 views

### Need help to identify this timer

This device is installed in our electrical panel which act as a timer to control the on/off operation for our LED billboard outside my office. I searched around the device for the brand and model it ...
85 views

### how phase frequency matches in reverse power flow situation

I have a question regarding smart energy systems. Consider a reverse power flow (where the power flows from household to grid) situation, A household has a solar installation and the energy obtained ...
107 views

### Need a switch/circuit breaker that stops power supply to equipment when power comes back after outage [duplicate]

I need a switch that stops power supply(220VAC) to led tv when power comes back after outage. So i need a circuit breaker that breaks the circuit when power supply is off and needs manual switch on ...
323 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-...
910 views

### how to trip a MCB without short circuit or over load?

I want trip a MCB whenever I want to trip using some ckt.I have found that there is two mechanism by which mcb trip: 1)Bi Metallica expansion 2)Solenoid effect. So i think of controlling the solenoid ...