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Mercury 5 x 20mm F10A Quick Blow Fuse - 250V Glass

£149
The RRP is the manufacturer's recommended retail price of the item.
Limited Stock
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Description

The Mercury F10A is a 5 x 20mm quick blow glass fuse rated at 10A and 250V, designed to interrupt current rapidly when a fault condition occurs. The glass barrel holds a thin metal filament that melts under overcurrent, breaking the circuit before downstream components are damaged. Quick blow construction means the fuse responds within milliseconds, making it suitable for protecting sensitive electronics and appliances where fast interruption is critical.

These fuses are used in audio equipment, power supplies, small appliances, consumer electronics and AV installations where a 10A overcurrent threshold is needed. The 5 x 20mm size is a standard IEC form factor and fits most equipment fuse holders designed for this dimension. The glass barrel allows visual inspection of the filament after a fault to confirm whether the fuse has blown.

The fuse meets IEC safety standards and is rated for 250V AC/DC operation. The 10A rating means the fuse will carry up to 10 amps of continuous current without interruption under normal conditions, but will blow rapidly if that threshold is exceeded by a short circuit, equipment fault or wiring error. The nickel-plated metal end caps provide reliable contact with the fuse holder terminals.

Frequently Asked

What's the difference between quick blow and slow blow fuses?

Quick blow fuses interrupt current within milliseconds of an overcurrent event, making them suitable for electronics and circuits with steady loads. Slow blow (time-delay) fuses tolerate brief surges and are used with motors or inductive loads that draw high current on startup. This F10A is quick blow, so it responds immediately to faults.

Can this fuse be used in mains plugs?

No. UK mains plugs require BS 1362 certified fuses, typically 13A or 3A in a different physical size. This 5 x 20mm fuse is designed for equipment-level protection inside appliances, amplifiers, power supplies and AV gear, not for plug-top use.

How do I know if the fuse has blown?

The glass barrel allows you to see the internal filament. If the filament is broken or has a visible gap, the fuse has blown. A darkened or discoloured interior also indicates the fuse has operated.

What current does this fuse carry continuously?

The fuse is rated at 10A, meaning it will carry up to 10 amps of continuous current without interruption. It will blow if current exceeds this threshold due to a fault or short circuit.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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    Description

    The Mercury F10A is a 5 x 20mm quick blow glass fuse rated at 10A and 250V, designed to interrupt current rapidly when a fault condition occurs. The glass barrel holds a thin metal filament that melts under overcurrent, breaking the circuit before downstream components are damaged. Quick blow construction means the fuse responds within milliseconds, making it suitable for protecting sensitive electronics and appliances where fast interruption is critical.

    These fuses are used in audio equipment, power supplies, small appliances, consumer electronics and AV installations where a 10A overcurrent threshold is needed. The 5 x 20mm size is a standard IEC form factor and fits most equipment fuse holders designed for this dimension. The glass barrel allows visual inspection of the filament after a fault to confirm whether the fuse has blown.

    The fuse meets IEC safety standards and is rated for 250V AC/DC operation. The 10A rating means the fuse will carry up to 10 amps of continuous current without interruption under normal conditions, but will blow rapidly if that threshold is exceeded by a short circuit, equipment fault or wiring error. The nickel-plated metal end caps provide reliable contact with the fuse holder terminals.

    Frequently Asked

    What's the difference between quick blow and slow blow fuses?

    Quick blow fuses interrupt current within milliseconds of an overcurrent event, making them suitable for electronics and circuits with steady loads. Slow blow (time-delay) fuses tolerate brief surges and are used with motors or inductive loads that draw high current on startup. This F10A is quick blow, so it responds immediately to faults.

    Can this fuse be used in mains plugs?

    No. UK mains plugs require BS 1362 certified fuses, typically 13A or 3A in a different physical size. This 5 x 20mm fuse is designed for equipment-level protection inside appliances, amplifiers, power supplies and AV gear, not for plug-top use.

    How do I know if the fuse has blown?

    The glass barrel allows you to see the internal filament. If the filament is broken or has a visible gap, the fuse has blown. A darkened or discoloured interior also indicates the fuse has operated.

    What current does this fuse carry continuously?

    The fuse is rated at 10A, meaning it will carry up to 10 amps of continuous current without interruption. It will blow if current exceeds this threshold due to a fault or short circuit.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.