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For example, a glass tube fuse rated at 32 volts would not reliably interrupt current from a voltage source of 120 or 230 V. If a 32 V fuse attempts to interrupt the 120 or 230 V source, an arc may result. Appliances that run on 220 volts must have a higher resistance so that they take less current to use the same amount of power as they would on 110volts. 220 volts connected to a 110 volts appliance would result in 4 times the power ending up in the appliance (because voltage is double and current is double), likely burning out the appliance. The voltage of a car battery is nominally quoted as 12 volts, but in reality, a fully charged car battery has a potential (another word for the voltage of a battery) of greater than 13 volts. Medium-voltage fuses rated for a few thousand volts are never used on low voltage circuits, because of their cost and because they cannot properly clear the circuit when operating at very low voltages. Surface-mount technology "chip type" fuses feature few or no markings, making identification very difficult. Better ones also include an MPPT feature to help maximize charging efficiency under a variety of temperature and brightness conditions, while cheaper ones will use "PWM" instead.

Ambient temperature will change a fuse's operational parameters. Once current is applied, resistance and voltage drop of a fuse will constantly grow with the rise of its operating temperature until the fuse finally reaches thermal equilibrium. This ensures that there is no electrical connection between the high-voltage power grid and the low-voltage electronic device, making it unlikely that the device will unexpectedly short-circuit when charging. Low-voltage high rupture capacity (HRC) fuses are used in the area of main distribution boards in low-voltage networks where there is a high prospective short circuit current. There is a direct relationship between a fuse's cold resistance and its voltage drop value. A time-delay fuse (also known as an anti-surge or slow-blow fuse) is designed to allow a current which is above the rated value of the fuse to flow for a short period of time without the fuse blowing. A standard fuse may require twice its rated current to open in one second, a fast-blow fuse may require twice its rated current to blow in 0.1 seconds, and a slow-blow fuse may require twice its rated current for tens of seconds to blow.

Normal fast-blow fuses are the most general purpose fuses. These types of fuse are used on equipment such as motors, which can draw larger than normal currents for up to several seconds while coming up to speed. Where the regulatory structure permits, the utility can sell capacity in extra dark fibers to a common carrier. That is the most common set-up. Fuses are designed to have particular characteristics of operating time compared to current. The operating time is not a fixed interval but decreases as the current increases. In substations, large air gaps or oil filled circuit breakers are necessary to quench the high current arcs which occur when high voltage is switched. A maximum current that the fuse can continuously conduct without interrupting the circuit. Voltage drop often is not significant in more traditional wire type fuses, but can be significant in other technologies such as resettable (PPTC) type fuses. If your system works with lithium-ion batteries, you need a different solar charge controller, which is more expensive.

Examples of DC sources are batteries, DC generators known as dynamos, solar cells and thermocouples. A thermopile is an array of thermocouples connected together, usually in series. Fuses come in a vast array of sizes and styles to serve in many applications, manufactured in standardised package layouts to make them easily interchangeable. In some countries, because of the high fault current available where these fuses are used, local regulations may permit only trained personnel to change these fuses. This is not the case with fuses, which rely on melting processes where no mechanical operation is required for the fuse to operate under fault conditions. This term is normally used in short circuit conditions and the values are used to perform co-ordination studies in electrical networks. Fuses for high-voltage equipment, up to 115,000 volts, are rated by the total apparent power (megavolt-amperes, MVA) of the fault level on the circuit. The clearing I2t is proportional to the total energy let through by the fuse when clearing a fault. The I2t rating is related to the amount of energy let through by the fuse element when it clears the electrical fault.

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