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MAGfire Isolator Switch Spare Fuses - Pack of 5

£399
The RRP is the manufacturer's recommended retail price of the item.
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Description

These are replacement fuses for ESP MAGfire fire isolator switches, supplied in a pack of five. Each fuse is a ceramic-bodied 20mm x 5mm cartridge fuse with nickel-plated brass end caps and a ceramic insulating body, designed to protect the fire alarm circuit from overload or short-circuit conditions.

The fuses are compatible with the ESP MAGISORP fire isolator switch and other MAGfire isolator models that use the same 20mm x 5mm cartridge format. Fire isolator switches are typically installed at the entry point of a fire alarm zone or panel to allow maintenance engineers to isolate a section of the circuit without de-energising the entire system. Replacing blown fuses promptly is essential to maintain circuit protection and ensure the fire alarm system remains compliant with BS 5839 regulations.

Each fuse carries the same current rating as the original equipment fuses supplied with ESP MAGfire isolator switches. The ceramic body provides high breaking capacity and thermal stability, preventing arc propagation when the fuse blows under fault conditions. The pack-of-five format suits maintenance contractors who service multiple installations or building managers maintaining on-site spares inventory.

Specification
Product Net Weight (KG) 0.01
Product Gross Weight (KG) 0.01
Downloads

Product Specification Sheet

Frequently Asked

Which ESP isolator switches do these fuses fit?

These fuses are designed for ESP MAGISORP fire isolator switches and other MAGfire models using 20mm x 5mm ceramic cartridge fuses. Check your isolator switch datasheet or the existing fuse markings to confirm compatibility before ordering.

What current rating do the fuses carry?

The fuse rating matches the original equipment specification for ESP MAGfire isolators. Refer to the datasheet linked in the Downloads tab for the exact current rating, or check the markings on your existing fuse.

How do I know when a fuse needs replacing?

A blown fuse will interrupt the circuit, typically triggering a fault indicator on the fire alarm panel or isolator switch. Visual inspection may show a broken internal element or discolouration of the ceramic body. Always isolate the circuit before removing or replacing fuses.

Can these be used in other applications?

These fuses are manufactured for fire alarm isolator circuits and meet the breaking capacity and thermal stability requirements of BS 5839 installations. Using them in non-fire alarm applications may not meet the safety standards required for that equipment.

Shipping & Returns

Free worldwide delivery

Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

Returns

30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.

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    Description

    These are replacement fuses for ESP MAGfire fire isolator switches, supplied in a pack of five. Each fuse is a ceramic-bodied 20mm x 5mm cartridge fuse with nickel-plated brass end caps and a ceramic insulating body, designed to protect the fire alarm circuit from overload or short-circuit conditions.

    The fuses are compatible with the ESP MAGISORP fire isolator switch and other MAGfire isolator models that use the same 20mm x 5mm cartridge format. Fire isolator switches are typically installed at the entry point of a fire alarm zone or panel to allow maintenance engineers to isolate a section of the circuit without de-energising the entire system. Replacing blown fuses promptly is essential to maintain circuit protection and ensure the fire alarm system remains compliant with BS 5839 regulations.

    Each fuse carries the same current rating as the original equipment fuses supplied with ESP MAGfire isolator switches. The ceramic body provides high breaking capacity and thermal stability, preventing arc propagation when the fuse blows under fault conditions. The pack-of-five format suits maintenance contractors who service multiple installations or building managers maintaining on-site spares inventory.

    Specification
    Product Net Weight (KG) 0.01
    Product Gross Weight (KG) 0.01
    Downloads

    Product Specification Sheet

    Frequently Asked

    Which ESP isolator switches do these fuses fit?

    These fuses are designed for ESP MAGISORP fire isolator switches and other MAGfire models using 20mm x 5mm ceramic cartridge fuses. Check your isolator switch datasheet or the existing fuse markings to confirm compatibility before ordering.

    What current rating do the fuses carry?

    The fuse rating matches the original equipment specification for ESP MAGfire isolators. Refer to the datasheet linked in the Downloads tab for the exact current rating, or check the markings on your existing fuse.

    How do I know when a fuse needs replacing?

    A blown fuse will interrupt the circuit, typically triggering a fault indicator on the fire alarm panel or isolator switch. Visual inspection may show a broken internal element or discolouration of the ceramic body. Always isolate the circuit before removing or replacing fuses.

    Can these be used in other applications?

    These fuses are manufactured for fire alarm isolator circuits and meet the breaking capacity and thermal stability requirements of BS 5839 installations. Using them in non-fire alarm applications may not meet the safety standards required for that equipment.

    Shipping & Returns

    Free worldwide delivery

    Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

    Returns

    30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.