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Fuses and circuit breakers are rated differently as applied to electrical loads. A motor load of 12 amps would require a fuse rating of 21 amps ( 12 X 1.75=21) or the next standard size of 25. A breaker for the same load of 12 amps would be a 30. (12 x 2.50=30) However if your circuit is number 10 copper wire and supplies 30 amp rated receptacles, you would be perfectly safe in using the fuses.

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Q: Can you use a 30 amp time delay fuse instead of a 30 amp inverse time circuit breaker?
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What devices shutdown immediately if a short circuit occurs?

A circuit breaker shuts down and can be reset. (A fuse does not "shutdown", it fails, or blows, or breaks and cannot be reused.) "Immediately" usually has a small delay and nothing is instantaneous.


Why is a timer is used in an electrical circuit?

Timer relays are used in control circuitry. There are two main types, an (off delay) and an (on delay). If you want one device to turn off before the timer controlled device then you would use an off delay timer. If you want one device to turn on before the timer controlled device then you would use an on delay timer. When the timer is energized this starts the timer circuit in the relay to time out.


What is meaning of switch on to fault in line protection?

Consider a case , where an earth switch is closed and You are trying to close the Line breaker , in this situation , the relay trips the breaker instantaneously without any conditions or any time delay . This is called Switc On To Fault .


Can time delay house fuse replace an ordinary fuse?

You could, but it would be safest not to. A time delay fuse will allow for a short (12 seconds or less) spike in the current (up to three times the rated current for the fuse). This happens when you start up a motor, or a compressor, etc... If you were to replace a regular fuse (say 2 amp) with a time delay fuse (also 2 amp), then instead of breaking the circuit at 2 amps, the circuit will go 12 seconds at 6 amps before shutting down. This could easily start a fire, so for your safety, it is best to replace a fuse with the exact same kind that came out of it.


Can you use a light timer that is rated at 15A and 115V with a circuit that is rated at 20A and 120V?

Yes you can. Please be aware you have the situation of pulling more amps, in this case 5 amps, over the timmer before the fuse blows. which may damage the timer To avopid this appliances plugged into the timer should be rated at 15 amps or less. Thgere are different type circuit breaker immediate and time delay for where an appliance such as motors exceed the limit to start then drop down when running?

Related questions

Is there a fuse for power windows for a 2002 Ford Explorer?

For a 2002 Ford Explorer, the 30 amp circuit breaker in location #62 of the power distribution box in the engine compartment is the power window circuit breaker. (unfortunately in the 2002 owner's manuals it is labelled accessory delay ) later years are labelled as the power window circuit breaker.


What devices shutdown immediately if a short circuit occurs?

A circuit breaker shuts down and can be reset. (A fuse does not "shutdown", it fails, or blows, or breaks and cannot be reused.) "Immediately" usually has a small delay and nothing is instantaneous.


What are two methods used in most circuit breakers to protect electrical circuits?

There is a heated bimetallic strip that provides a time delay small overload protection. When its contact makes, it energizes a coil to trip the breaker. Some breakers are mechanical, though. There is a coil that trips the breaker instantly on large overload.


What is 50G protection relay mean?

50 is the ANSI device number for an instantaneous overcurrent relay. The G suffix stands for "ground." A 50G protection relay trips the circuit breaker without time delay when it detects a ground fault on the circuit.


Types of circuit breakers?

There are several type of circuit breakers now a day we are using these are as follows: 1. M.C.B. (Miniature circuit Breaker) Rating : 1, 2, 4, 6, 10, 16, 20, 25, 32, 63 Amperes 2. M.C.C.B. (Miniature current circuit Breaker) Rating : 10, 16, 20, 25, 32, 63, 100, 200, 250, 400 Amperes. 3. A.C.B. (Air Circuit Breaker) Rating : 400, 800, 1000, 1200, 1500, 1800, 2000 Amperes. 4. A. B. Switch (Air Breaker) used in High tension line. 5. SF6 Breaker (Contact break in the Sf6 medium) used in High tension line.


How can you make a circuit close at a set delay time?

try using a 555 circuit


What makes a time delay fuse burn out?

Short in circuit wiring or circuit overloaded.


Why when you indicate to turn does the clicking continue to go on for awhile after you have straightened up and driven for several meters on GOLF GTI 2001?

The flashing of a car indicator is caused by a variation of a circuit breaker. When you straighten your path, there is a slight delay in the sensors which control this car circuit. This is not unusual in any car, and you can expect a delay of anywhere up to a few seconds. JUST SPRAY SWITCH CLEANER IN YOUR TURN SIGNAL STALCK JOB DONE NO MORE CLICKS


Why would the headlight delay power mirrors radio electric trunk lid power door locks and interior lights stop working at the same time on a lhs?

They must share a common thread, maybe a bad circuit breaker or fuseable link.


What is the main function of the magnetic trip in a circuit breaker?

The panel circuit-breaker trips two ways: (1) instant-magnetically; (2) by delayed thermal overload. Instant-magnetically responds to a huge, direct short circuit, where thousands of Amperes may flow immediately. The resulting magnetic field around a hairpin of heavy wire in the breaker pushes the wire arms apart, releasing the latch in the breaker very quickly. The breaker also contains a bi-metalic conductor that bends as it gets hot. If the current exceeds the breaker capacity for a few seconds to a minute the bi-metalic arm heats, bends and releases the latch in the breaker. The thermal-delay allows motors with large startup-current to get running without tripping the breaker. THE REST OF THE STORY: In other words, 20 Amp breaker can supply 40 amps or more for a few seconds. Not enough time to overheat the wire to the outlet, but enough time for a motor's centrifugal-switch to disconnect the start winding. If you overload the circuit a little bit, say 24 amps from a 20-Amp breaker, it will trip, but maybe not for a half hour or hour. On a hot day the thermal release will act more quickly, even though the current will be slightly less because copper wire has a higher resistance when warm.


Why there is a time delay in the overload fault?

Most overload faults are isolated through a circuit breaker operating on a inductive trigger. Inductors take time to build up their magnetic field related to the total circuit resistance. The lower the overall circuit resistance and higher Henry value of the inductor, the longer it will take the magnetic field to develop. Electric motors and compressors for instance pull a very heavy load at startup. You need a time delay fuse as a normal fuse would blow every time the motor or compressor started.


How is Circuit Breakers trip by Relays?

One common method (used for more than just differential relays) is to have a contact in series with one of the breaker trip coils, with this arrangement connected to a battery or AC power source. When the relay trips, the contact closes and current is allowed to flow through the trip coil, tripping the breaker. Some relays are self powered, and will use a capacitor to provide the current to the coil instead of a battery bank or AC power source. Differential relays often indirectly trip the associated breakers through a lockout relay. The differential relay trips the lockout, which has many contacts that close, tripping multiple breakers.