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A fuse is connected
in series with circuit
in parallel with circuit
either in series or in parallel with circuit
none of the above
in series with circuit
A fuse is a safety protection device that must be connected in series with the phase wire of the electrical circuit. By being in series, the entire load current flows through the fuse element, allowing it to detect and interrupt the circuit immediately when the current exceeds a predetermined threshold.
A fuse is a safety protection device that must be connected in series with the phase wire of the electrical circuit. By being in series, the entire load current flows through the fuse element, allowing it to detect and interrupt the circuit immediately when the current exceeds a predetermined threshold.
H=I2Rt тАФ The principle of Joule heating which causes the fuse element to melt
IfuseтАЛтЙИ1.25├ЧIratedтАЛ тАФ Typical rating guideline for fuse selection
The fuse operates on the heating effect of electric current (H=I2Rt). When a fault condition such as a short circuit or overload occurs, the current significantly increases, causing the fuse element to melt due to excess heat. Because it is connected in series, the melting of the element creates an open circuit, effectively isolating the load from the power supply and preventing damage.
Always connected to the 'Live' or 'Phase' wire, never the 'Neutral'.
Acts as an overcurrent protection device to prevent fire hazards and equipment damage.
The fuse link consists of a low-melting-point material like lead, tin, or copper alloys.
Simple and inexpensive design
Provides reliable current-limiting protection
Acts instantaneously under high-fault current conditions
Non-reusable (must be replaced after operation)
Can lead to single-phasing in 3-phase systems if only one fuse blows
Potential for nuisance tripping due to aging
Domestic wiring systems
Power distribution transformers
Industrial control panels
A fuse connected in parallel would result in a direct short-circuit path when the fuse blows, bypassing the load.
Fuses are classified into Rewirable and HRC (High Rupturing Capacity) types.
A is correct тАФ A fuse is connected in series with the circuit to ensure all load current passes through it, enabling it to break the circuit during overcurrent events.
In competitive exams, remember that protection devices like Fuses and MCBs (Miniature Circuit Breakers) are always in series, while voltage monitoring devices like Voltmeters are always in parallel.