Common questions

What is a QA fuse?

What is a QA fuse?

Type QA (tube color yellow) Kearney Type QA fuse links are classified as “medium” speed fuse links with a nominal speed ratio of 10. Type QA fuse links will carry 100% of the rated current continuously without damage, and provide good coordination possibilities with relays and reclosers.

What is a Type k fuse?

The Type K current limiting fuse canister provides an air-insulated receptacle for general-purpose current limiting fuses used on pad mounted or submersible transformers.

What is a HRC fuse link?

This type of fuse contains a fuse wire in it, which carries the short circuit current safely for a given time period. Its external enclosure is made fully airtight in order to avoid the effect of atmosphere on the fuse materials. …

What is class T fuse?

A Class T fuse is a fast acting, current limiting, fuse that is rated to interrupt a minimum of 200,000 amps. The Type T Fuse is offered in 300 volt AC and 600 volt AC versions. Type T Fuse ampere ratings range from1 to 800 amps.

What are Class J fuses used for?

Class J fuses are commonly used in branch circuits, motor circuits, mains, feeders, control panels, electronic motor controllers, drives, soft-starters, circuit breaker back-up, transformers, load centers, lighting, heating and general loads to name a few.

What is a spade fuse?

Blade fuses (also called spade or plug-in fuses), with a plastic body and two prongs that fit into sockets, are mostly used in automobiles. Each fuse is printed with the rated current in amperes on the top. These types of fuses come in six different physical dimensions: Micro2. Micro3.

What is the disadvantage of HRC fuse?

Disadvantages of HRC fuses : Heat produced by the arc may affect the associated switches. They have to be replaced after each operation.

How is HRC fuse rating calculated?

The fuse rating can be calculated by dividing the power used by the appliance by the voltage going into the appliance. I (Amps) = P (Watts) ÷ V (Voltage).

What is an R fuse?

Class R (“R” for rejection) fuses are high performance, 1⁄10 to 600A units, 250V and 600V, having a high degree of current-limitation and a short-circuit interrupting rating of up to 300,000A (RMS symmetrical). The use of Class R fuse holders is thus an important safeguard.

What kind of fuse links do GE use?

Motor Circuit Protection RED SPOT Standard Fuse Links combined with GE Power Controls ‘CL’ and ‘CK’ range of contactors and ‘RT’ thermal overload relays, provide certified Type 2 co-ordination in line with the latest International Standards (IEC 947-4-1).

What is the speed ratio of Kearney fuse links?

Kearney offers six types of fuse links with a wide range of time-current characteristics (refer to Table 1). The speed ratio of all fuse link sizes 100 A and below is the ratio between the current that melts the fuse in 0.1 seconds to the current that melts the fuse in 300 seconds.

What are the HRC fuse links for low voltage?

Commercial Industrial RED SPOT / SAFECLIP / ‘ NH ’ Low Voltage Industrial HRC Fuse Links RED SPOT Standard Bolted Tag up to 660Vac up to 1250A RED SPOT 400 Series Bolted Tag up to 440Vac up to 400A SAFECLIP Blade Tag up to 440Vac up to 125A ‘NH’ DIN Standard Knife Blade up to 500Vac up to 630A

Can a red spot fuse link protect a PVC cable?

Protection of PVC insulated cables RED SPOT Standard Fuse Links will protect an associated cable against both overload and short circuit if its current rating is equal to or less than the current rating of the cable. This is in accordance with the IEE Wiring Regulations (BS 7671:1992).

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