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Mercury 5 x 20mm T10A Slow Blow Fuse - 250V IEC Approved

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

The Mercury T10A is a 5 x 20mm glass cartridge fuse rated at 10A and 250V, designed as a slow blow (time-delay) fuse for circuits where initial surge current is normal but sustained overload must be interrupted. The glass body contains a fusible element that tolerates brief current spikes without melting, then blows cleanly when sustained overload exceeds the 10A rating.

Slow blow fuses suit motors, transformers, switch-mode power supplies and other inductive loads that draw a high inrush current on startup before settling to a lower running current. A fast-blow fuse would trip unnecessarily on startup; a slow blow fuse allows the surge, then protects the circuit during continuous operation. The 5 x 20mm cartridge fits standard panel-mount and PCB-mount fuse holders, and is a common replacement size in audio amplifiers, lighting control circuits and low-voltage power distribution boards.

The fuse is manufactured to IEC standards, ensuring consistent blow characteristics and predictable performance under fault conditions. Each fuse is marked with the T10A rating on the metal end caps, allowing quick identification when replacing. The transparent glass body allows visual inspection of the fusible element to confirm whether the fuse has blown.

Frequently Asked

What does "slow blow" mean?

Slow blow (also called time-delay) means the fuse tolerates brief current surges above its rating without blowing. This suits circuits where inrush current on startup is normal, such as motors or transformers. A sustained overload above 10A will still blow the fuse within seconds.

What voltage is it rated for?

The fuse is rated at 250V. It can be used in circuits up to 250V AC or DC, including standard UK 230V mains-fed equipment and lower-voltage distribution circuits.

Will it fit my fuse holder?

The 5 x 20mm cartridge is a standard size that fits most panel-mount and PCB-mount fuse holders rated for this dimension. Measure your existing fuse to confirm it's 5mm diameter and 20mm long.

How many fuses are in the pack?

Pack quantity depends on the SKU variant. Check the product title or specification table for the exact quantity supplied.

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 T10A is a 5 x 20mm glass cartridge fuse rated at 10A and 250V, designed as a slow blow (time-delay) fuse for circuits where initial surge current is normal but sustained overload must be interrupted. The glass body contains a fusible element that tolerates brief current spikes without melting, then blows cleanly when sustained overload exceeds the 10A rating.

    Slow blow fuses suit motors, transformers, switch-mode power supplies and other inductive loads that draw a high inrush current on startup before settling to a lower running current. A fast-blow fuse would trip unnecessarily on startup; a slow blow fuse allows the surge, then protects the circuit during continuous operation. The 5 x 20mm cartridge fits standard panel-mount and PCB-mount fuse holders, and is a common replacement size in audio amplifiers, lighting control circuits and low-voltage power distribution boards.

    The fuse is manufactured to IEC standards, ensuring consistent blow characteristics and predictable performance under fault conditions. Each fuse is marked with the T10A rating on the metal end caps, allowing quick identification when replacing. The transparent glass body allows visual inspection of the fusible element to confirm whether the fuse has blown.

    Frequently Asked

    What does "slow blow" mean?

    Slow blow (also called time-delay) means the fuse tolerates brief current surges above its rating without blowing. This suits circuits where inrush current on startup is normal, such as motors or transformers. A sustained overload above 10A will still blow the fuse within seconds.

    What voltage is it rated for?

    The fuse is rated at 250V. It can be used in circuits up to 250V AC or DC, including standard UK 230V mains-fed equipment and lower-voltage distribution circuits.

    Will it fit my fuse holder?

    The 5 x 20mm cartridge is a standard size that fits most panel-mount and PCB-mount fuse holders rated for this dimension. Measure your existing fuse to confirm it's 5mm diameter and 20mm long.

    How many fuses are in the pack?

    Pack quantity depends on the SKU variant. Check the product title or specification table for the exact quantity supplied.

    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.