Find the size of fuse by **multiplying the amps required by the device** (2) by 1.5. 2×1.25 = 2.5 then we will round up to the nearest fuse size (in multiples of 5 amps) which would call for a 5 amp fuse. Cross Reference that fuse size to verify that it's below the Maximum fuse size called out by this chart.

How do you choose the size of a fuse? The voltage and current ratings are paramount. **A fuse should be de-rated by 25% at room temperature**, meaning if there is a 7.5 amp circuit, a 10 amp fuse should be used at 25˚C. Voltage ratings on a fuse can be higher than the voltage on the circuit, but not lower.

What size fuse do I need for a 1500 watt amp?

A 2500 watt uses a 250 Amp fuse, while a 1500 watt uses a **150 Amp** fuse.

How do I know what size fuse for my amp?

**You'll usually find the fuse rating on the side of your fuse**, which will be given in amps. Fuse rating is the amount of current needed for the fuse to blow or break. When this happens, it stops the electrical power from flowing through the electrical circuit.

What size fuse do I need for a 1200 watt amp?

You should use **at least a 100A fuse**. The fuse at the batt. is to protect the power wire.

How big of a fuse do I need for my amp?

**If your amplifier has an internal fuse, your inline car amp fuse should be a bit larger**. For example, use a 25- or 30-amp inline fuse if your amp has an internal 20-amp fuse. If you have two amps with internal fuses, add the amperage ratings together to figure out the right size for your inline fuse.

When replacing a fuse What must you match?

You must match the **exact type and amperage** (AMP 15, 20 or 30) for the fuse you are replacing.

Will a 250v fuse work for 125v?

**A 250 volt fuse is likely to blow out a 125 volt electronics that was not designed to withstand such high power**. You don't want to send 250 volts to a 125 volt circuit.

Can I use 8 gauge wire for a 1000w amp?

I would run at least 4 gauge for that setup. At full load (or even 70% demand) on your amp ratings you are over the rated capacity of 8 gauge. **If you hook up your 8 gauge and experience a large draw for a long period of time, there is a chance you could melt the wire and possibly start a fire**.

What size wire do I need for a 1000 watt inverter?

**4 AWG Battery Cables**

Four AWG battery cables should be used on power inverters rated up to 1500 watts and most commonly used on 900, 1000, 1100, 1200 watt inverters. Smaller sized inverters generally come with a short 6 AWG cable which is included with the inverter.

**Related Questions
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### What size circuit breaker do I need for my inverter?

To determine the size of an inverter circuit breaker: 1. **Multiply the inverter's maximum continuous output current by the factor**. For example, 40A x 1.25= 50A 2. Round up the rated size, as calculated in step 1, to the closest standard circuit breaker size.

### What 3 ratings should always be matched when changing fuses?

You must match the exact type and amperage (**AMP 15, 20 or 30**) for the fuse you are replacing.

### Can I replace a 125V fuse with a 250V fuse?

So **yes, you can use a 250V fuse in place of a 125V fuse as long as the current rating is the same**. You can never apply a fuse whose max voltage rating is smaller than the application voltage. You can replace a 125V fuse with a 250V fuse of equal amperage as long as the application voltage is 250V or less.

### Does voltage matter for fuses?

**Yes, very important**! The voltage rating of the selected fuse must be greater than or equal to the circuit voltage. Since fuses have such low resistance, the voltage rating becomes critical only when the fuse is trying to open.

### What size circuit breaker do I need for a 1000 watt inverter?

However the cable is not suitable for a 1000 watt inverter ( it will take around 90 amps, perhaps more on short term overloads) you need at least 16mm2 cable, and to minimize volt drops, 25mm2 cable would be better. This would need a fuse or breaker at the battery rated at least 100 amps, perhaps 125 amps, or 150 amps.

### How do you select a fuse for a circuit?

Make sure to **select a fuse that has a rated voltage higher than the voltage of the circuit**. The rated voltage of a fuse is the maximum voltage at which the fuse can safely interrupt an abnormal current.

### How do you choose a fuse rating?

In order to select the right amperage of the fuse, you first need to know the full-load steady-state current of the circuit at an ambient temperature of 25º C (68º F). Once the current value is determined, then a fuse rating should be selected as to be 135% of this value (taken to the next standard value).

### How do you determine fuse rating?

The fuse rating can be calculated by **dividing the power used by the appliance by the voltage going into the appliance**. I (Amps) = P (Watts) ÷ V (Voltage).

### Can I replace a fuse myself?

3 Steps to Fixing a Blown Fuse. Don't let a blown fuse intimidate you. **Replacing a fuse is a relatively easy, do-it-yourself home task** that you can tackle with a little information and some electrical home safety savvy.

### How can I tell if a fuse is blown in my house?

For a fuse box: If your electrical panel has fuses, **check each fuse to see if the piece of metal inside has melted, or if the glass window at the top of the fuse has become discolored (usually purple or brown)**. That's your home's blown fuse.

### Can I plug 125V to 250V?

**It is possible to use a power cord that is rated higher than the maximum you need**. The original cord had a rating of 10A, 125V. The one you found is rated at 10A and will give you twice the power as it will actually encounter.

### Can I use a 250V fuse instead of 12V?

**yes, you can use them**, the amp rating does not change. the 250V rating means that they are safe to use in 250V circuit, but may arc at higher voltages. @jsotola, good work, please convert comment to answer.

### Does voltage change fuse rating?

**The voltage rating on the fuse can be higher than the voltage present on the circuit, but not the other way around**. If a 250 V_{AC} fuse is used on a device that uses 120 V_{AC}, there should be no problem.

### What gauge wire do I need for a 1200 watt amp?

**4 Gauge** Power Amplifier/amp Kit 1200 Watt Complete Install Wiring Kit Car.

### Will #8 wire carry 50 amps?

Up to a point, the higher the temperature, the higher the current the wire can handle. **An 8-gauge wire can handle a current of 50 amps at a temperature of 90-Celsius or 194-Fahrenheit**.