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This is a new service where we deliver your order within a one-hour time slot of your choice. Subject to availability, hourly time slots can be selected from the day you place your order. The vehicles we use for our Hourly service are smaller in size, so there are a few restrictions to bear in mind.

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To qualify for Hourly delivery, your order will need to:. You can then choose a convenient delivery time from the hourly slots available.

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We may be able to deliver your order the next working day, depending on available space. However, some of the heavier products have a 7 working day lead time see below. This depends on when you place your order. Items with a normal lead time will be delivered as follows:. We usually deliver between 7am and 8pm. Yes, subject to availability. For 7 day products, delivery will be made the Saturday after you place your order, so it may take more than 7 working days for it to arrive. You can return any unused product to us in its original condition for a refund within 30 days of delivery to you.

Please note that we may be unable to accept the return of made-to-measure products unless they are faulty or have been damaged in transit. Within 30 days of receipt, any unused product can be returned at your expense for a full refund or exchange.

Fuse (electrical)

Bring it to any of our branches, or contact our Customer Service team on or at customerservices wickes. Proof of purchase is required and all products must be undamaged in their original packaging and include all relevant accessories. As a consumer customer you may have additional legal rights and this policy does not affect these rights.

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Thank you for your details. We'll notify you as soon as Wickes Fuse Wire - Pack of 3 becomes available again. Find Stores Find stores near me. Try a different postcode: The IEC standard unifies several national standards, thereby improving the interchangeability of fuses in international trade. All fuses of different technologies tested to meet IEC standards will have similar time-current characteristics, which simplifies design and maintenance.

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Additional standard ampere ratings for fuses are 1, 3, 6, 10, and UL currently has 19 "parts". UL sets the general requirements for fuses, while the latter parts are dedicated to specific fuses sizes ex: The general requirements apply except as modified by the supplemental part x. For example, UL allows photovoltaic fuses to be rated up to volts, DC, versus volts under the general requirements. IEC and UL nomenclature varies slightly. IEC standards refer to a "fuse" as the assembly of a fusible link and a fuse holder. In North American standards, the fuse is the replaceable portion of the assembly, and a fuse link would be a bare metal element for installation in a fuse.

Automotive fuses are used to protect the wiring and electrical equipment for vehicles. There are several different types of automotive fuses and their usage is dependent upon the specific application, voltage, and current demands of the electrical circuit. Automotive fuses can be mounted in fuse blocks, inline fuse holders, or fuse clips.

Some automotive fuses are occasionally used in non-automotive electrical applications. Most automotive fuses rated at 32 volts are used on circuits rated 24 volts DC and below. Fuses are used on power systems up to , volts AC. High-voltage fuses are used to protect instrument transformers used for electricity metering, or for small power transformers where the expense of a circuit breaker is not warranted. A circuit breaker at kV may cost up to five times as much as a set of power fuses, so the resulting saving can be tens of thousands of dollars. In medium-voltage distribution systems, a power fuse may be used to protect a transformer serving 1—3 houses.

Pole-mounted distribution transformers are nearly always protected by a fusible cutout , which can have the fuse element replaced using live-line maintenance tools. Medium-voltage fuses are also used to protect motors, capacitor banks and transformers and may be mounted in metal enclosed switchgear, or rarely in new designs on open switchboards. Large power fuses use fusible elements made of silver , copper or tin to provide stable and predictable performance. High voltage expulsion fuses surround the fusible link with gas-evolving substances, such as boric acid.

When the fuse blows, heat from the arc causes the boric acid to evolve large volumes of gases. The associated high pressure often greater than atmospheres and cooling gases rapidly quench the resulting arc.

The hot gases are then explosively expelled out of the end s of the fuse. Such fuses can only be used outdoors. These type of fuses may have an impact pin to operate a switch mechanism, so that all three phases are interrupted if any one fuse blows. High-power fuse means that these fuses can interrupt several kiloamperes. Fuses have the advantages of often being less costly and simpler than a circuit breaker for similar ratings. The blown fuse must be replaced with a new device which is less convenient than simply resetting a breaker and therefore likely to discourage people from ignoring faults.

On the other hand, replacing a fuse without isolating the circuit first most building wiring designs do not provide individual isolation switches for each fuse can be dangerous in itself, particularly if the fault is a short circuit. Special current-limiting fuses are applied ahead of some molded-case breakers to protect the breakers in low-voltage power circuits with high short-circuit levels.

Current-limiting fuses operate so quickly that they limit the total "let-through" energy that passes into the circuit, helping to protect downstream equipment from damage. These fuses open in less than one cycle of the AC power frequency; circuit breakers cannot match this speed. Some types of circuit breakers must be maintained on a regular basis to ensure their mechanical operation during an interruption.

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. In a multi-phase power circuit, if only one fuse opens, the remaining phases will have higher than normal currents, and unbalanced voltages, with possible damage to motors. Fuses only sense overcurrent, or to a degree, over-temperature, and cannot usually be used independently with protective relaying to provide more advanced protective functions, for example, ground fault detection.

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Some manufacturers of medium-voltage distribution fuses combine the overcurrent protection characteristics of the fusible element with the flexibility of relay protection by adding a pyrotechnic device to the fuse operated by external protective relays. In the UK, older electrical consumer units also called fuse boxes are fitted either with semi-enclosed rewirable fuses BS or cartridge fuses BS Modern consumer units usually contain miniature circuit breakers MCBs instead of fuses, though cartridge fuses are sometimes still used, as in some applications MCBs are prone to nuisance tripping.

Renewable fuses rewirable or cartridge allow user replacement, but this can be hazardous as it is easy to put a higher-rated or double fuse element link or wire into the holder overfusing , or simply fitting it with copper wire or even a totally different type of conducting object coins, hairpins, paper clips, nails, etc. One form of fuse box abuse was to put a penny in the socket, which defeated overcurrent protection and resulted in a dangerous condition. Such tampering will not be visible without full inspection of the fuse.

Fuse wire was never used in North America for this reason, although renewable fuses continue to be made for distribution boards. The Wylex standard consumer unit was very popular in the United Kingdom until the wiring regulations started demanding residual-current devices RCDs for sockets that could feasibly supply equipment outside the equipotential zone.

Some Wylex standard models were made with an RCD instead of the main switch, but for consumer units supplying the entire installation this is no longer compliant with the wiring regulations as alarm systems should not be RCD-protected. There are two styles of fuse base that can be screwed into these units: Over the years MCBs have been made for both styles of base.

In both cases, higher rated carriers had wider pins, so a carrier couldn't be changed for a higher rated one without also changing the base. Cartridge fuse carriers are also now available for DIN-rail enclosures. In North America, fuses were used in buildings wired before These Edison base fuses would screw into a fuse socket similar to Edison-base incandescent lamps.

Ratings were 5, 10, 15, 20, 25, and 30 amperes.

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To prevent installation of fuses with an excessive current rating, later fuse boxes included rejection features in the fuse-holder socket, commonly known as Rejection Base Type S fuses which have smaller diameters that vary depending on the rating of the fuse. This means that fuses can only be replaced by the preset Type S fuse rating.

Existing Edison fuse boards can easily be converted to only accept Rejection Base Type S fuses, by screwing-in a tamper-proof adapter. This adapter screws into the existing Edison fuse holder, and has a smaller diameter threaded hole to accept the designated Type S rated fuse.

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Some companies manufacture resettable miniature thermal circuit breakers , which screw into a fuse socket. However, any such breaker sold today does have one flaw. It may be installed in a circuit-breaker box with a door. If so, if the door is closed, the door may hold down the breaker's reset button. While in this state, the breaker is effectively useless: In the s, fuses in new residential or industrial construction for branch circuit protection were superseded by low voltage circuit breakers.

Where several fuses are connected in series at the various levels of a power distribution system, it is desirable to blow clear only the fuse or other overcurrent device electrically closest to the fault. This process is called "coordination" or "discrimination" and may require the time-current characteristics of two fuses to be plotted on a common current basis.

Fuses are selected so that the minor, branch, fuse disconnects its circuit well before the supplying, major, fuse starts to melt. In this way, only the faulty circuit is interrupted with minimal disturbance to other circuits fed by a common supplying fuse. Where the fuses in a system are of similar types, simple rule-of-thumb ratios between ratings of the fuse closest to the load and the next fuse towards the source can be used.

So-called self-resetting fuses use a thermoplastic conductive element known as a Polymeric Positive Temperature Coefficient or PPTC thermistor that impedes the circuit during an overcurrent condition by increasing device resistance. The PPTC thermistor is self-resetting in that when current is removed, the device will cool and revert to low resistance.

A thermal fuse is often found in consumer equipment such as coffee makers , hair dryers or transformers powering small consumer electronics devices. They contain a fusible, temperature-sensitive composition which holds a spring contact mechanism normally closed. When the surrounding temperature gets too high, the composition melts and allows the spring contact mechanism to break the circuit. The device can be used to prevent a fire in a hair dryer for example, by cutting off the power supply to the heater elements when the air flow is interrupted e.

Thermal fuses are a 'one shot', non-resettable device which must be replaced once they have been activated blown.

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  • A cable limiter is similar to a fuse but is intended only for protection of low voltage power cables. It is used, for example, in networks where multiple cables may be used in parallel. It is not intended to provide overload protection, but instead protects a cable that is exposed to a short circuit. The characteristics of the limiter are matched to the size of cable so that the limiter clears a fault before the cable insulation is damaged. From Wikipedia, the free encyclopedia.

    For other uses, see Fuse disambiguation. A miniature time-delay V fuse that will interrupt a 0. Patent Office number "Fuse Block". Newber Jan 1, Electric Fuses, 3rd Edition. Archived from the original on Archived from the original PDF on Mike Holt Enterprises, Inc. Potentiometer digital Variable capacitor Varicap. Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch.

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