DZ47 Series Circuit Breakers

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Q: I recently blew a 25a fuse in a mini fridge which was soldered in. I currently don't have a 25a fuse to replace it with so what would happen if I used a 30a fuse instead?: the short answer is probably nothing. the fuse is oversized compared to the breaker feeding the circuit because when the motor starts a large inrush current flows for a short time before the load stabilizes. It would be nice to get the right fuse but in this case I doubt that it is a crisis as the circuit feeding the fridge is already fused at 15 or 20 amps.

Q: I made a harness for some fog lights and when i touch it straight to the battery.it sparksis this becuase it needs to go through the relay and fuse to work properly? with no sparks?: the spark is due to the fact that you are creationg the connection without a switchthus you are firing up the lights by direct contact to the battery. This will create a spark every time. you need to run them through a switch to make them operate properly. Basically you are creating a short in the system when touching the wires directly to the battery. Put an inline switch and you will be ok.

Q: have replaced alternator, speed control censer, electric fuel pump. When fuses are replaced car starts , but dies when put in reverse. and blows another relay fuse.: You have a short somewhere either in your starter or that speed sensor you replaced. I would check all wiring if no short i would be looking at the ECU.

Q: I'm adding fuses and a relay for a 10 HP motor on 480v. I figure that it draws about 15-20 amps under load but that does that account for the start up in rush current? Should I be using a 50-60 breaker/fuses? If I'm using fuses, I assume that I would need to divide the amps by phases. ie 60 amps total and 3 phases 3, 20 amp fuses?: You are about correct for a three-phase motor. I'm reading 14 amps, but this depends on the type of motor and varies. You always figure amps per phase in circuits. Breaker ampere trip ratings are also listed per phase. Motor inrush can be four to seven times full load amp rating for motors (depending on the type of motor). This value is often referred to as locked rotor amps. If you size a breaker or fuse as you would another type of circuit, such as a lighting circuit, you will continually trip a breaker or clear a fuse. If you are in the U.S. and need to provide this per NEC, then the requirement is, you can select a circuit breaker up to 250% of the full load amps. If the motor is protected by fuses, you are allowed a fuse rating up to 175% of the full load motor rating. Assuming 14 amps full load, the apparent breaker rating would be 35 amps. You can select a 40 amp breaker since it is the next commonly available breaker rating above 35 amps. Feeder circuit conductors for the motor need to be sized 125% of the full load rating per the NEC. 14 x 125% 17.5; so #12 AWG (which is rated up to 20 amps) circuit conductors are minimum.

Q: Hey i just bought a van for travling and i was wondering what can i run off a 12 volt power point?? kettle ' fan ect.: you should be able to run anything that does not exceed the amperage rating of the fuse for the power point this is usually about 10-15 amps, depending on the vehicle and what other components this fuse controls. If we consider that wattsvoltage x current that means that you should be fine with anything that is rated at under 120-180 watts or a combination of things (using a splitter) totaling less than that. Find the fuse that controls your power power point, and look at its amperage rating. I would assume that this fuse also controls other components as well (dome lights, etc.). Multiply its amperage by twleve and that is the MAXIMUM number of watts that can be used on that circuit. Since this represents the maximum number of amps possible on the circuit (and probably would result in a blown fuse) dont pick an appliance that matches the wattage number you calculate or you will overload the circuit and blow a fuse. Other than that you can use just about anything that meets these requirements.

Q: I need to get a ball park idea regarding fixing or replacing the cigarette lighter in my car--- 2005 Hyundai Accent specifically, but curious how much it would cost for any car. It is not a fuse problem--- when I was pulling my phone charger out, it ripped some component out with it (a metal ring and a smaller metal piece). If I try to plug something it, it sparks and caused my GPS unit to reset, etc.: It's inexpensive.

Q: Help me please. My son installed a battery into his 99 ford escort. However he attached neg to pos and pos to neg. Can this fry out the alternator. Or could it simply be something electrical. There was a wire left off, going to somewhere. And a black wire coming from the internal fuse box.: The alternator and other components might be fried also, have a mechanic check everything

Q: I was trying to connect two power supplies together so that I could have a positive and a negative voltage. I mis wired and now one of the power supplies went out and doesn't turn on anymore. What are some possible problems? I'm guessing that it's just a fuse that went out.: What did you do? Did you tie the negative of PS 1 to the positive of PS2 and the positve of PS1 to the negative of PS2? If so you probably have done internal damage to one of the power supplies. Hopefully you can get a schematic and fix it. Unfortunately fuses don't always protect the device they are used with.

Q: If you add in cost of each component you will definetly win.Please reply soon. First to answer with good reply will win 10 POINTS!: no where near enough information. Purpose of circuit, number of additional circuits, are you tying into an existing circuit designing from scratch, Constant circuit, power option circuit (Turn signal, window, alarm) come on throw us a bone here Building a camping stove ehhhh? 12 volt D.C. heavy duty switch 60 ampre should suffice. Around 10 bucks 12 foot spool of 10 guage wire 15 bucks 10 guage inline fuse holder with 50 amp fuse 12 bucks Package of assorted wire ends 14 bucks (or solder and/or soldering iron) price of element unknown (never bought one before) Interstate Battery re-manufactured $25, new $90, deep cycle new $125 60 amp rheostat (to control temperature) 45 bucks Assuming you are talking about a heating element

Q: I was restarting my computer, and it started buzzing.It was coming from the mobo speaker, and now it won't turn on.On the front of it, the 3 and 4 lights are lit up.Can anyone help me?: Hi I also heard same buzzing sound from CPU's speaker when I replaced its ram Well, after that, the motherboard was bearned I hope this is not the case with you Try this Open the CPU, clean the fans and dust from all the hardwares Its possible that the fans needs some cleaning, and the motherboard is heating up, which is stopping your computer to boot up

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