What is a Lpj fuse?

Long time-delay minimizes needless fuse openings due to temporary overloads and transient surges. • Can often be sized for back-up protection against motor burnout from overload or single-phasing if other overload protective devices fail.

What are standard fuse sizes?

Standard sizes for fuses and fixed trip circuit breakers, per 240.6, are 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000 5000, and 6000 amps.

What does Class J fuse mean?

A Class J fuse is a 600 volt AC current limiting, fuse that is rated to interrupt a minimum of 200,000 amps. Bussmann, Littelfuse and Mersen self-certify their Class J fuses to a 300,000 interrupting rating,. Ampere ratings for the J type fuses range from 1 to 600 amps.

What are the different fuse classes?

The following information is provided to analyze several of these fuse classes, along with pertinent performance characteristics and ratings.

• Class CC fuses.
• Class G fuses.
• Class H fuses.
• Class J fuses.
• Class K fuses.
• Class L fuses.
• Class R fuses.

What does low peak fuse mean?

Short-Circuit Current Rating
Low-Peak fuses help reduce fault currents to meet new assembly Short-Circuit Current Rating (SCCR) requirements for equipment installations. And selective coordination is easy with a 2:1 amp ratio between upstream and downstream fuses.All with less inventory and cost.

What is Bussmann fuse?

Bussmann series fuses play a major role in industrial or commercial facilities by providing reliable, maximum protection to power systems. Their physical size or rejection features prevent replacing a fuse with one from another fuse class.

How do you size a 12v fuse?

Find the size of fuse by multiplying the amps required by the device (2) by 1.5. 2×1.25 = 2.5 then we will round up to the nearest fuse size (in multiples of 5 amps) which would call for a 5 amp fuse. Cross Reference that fuse size to verify that it’s below the Maximum fuse size called out by this chart.

How do I choose a fuse size?

B Calculate MINIMUM FUSE AMPERAGE by multiplying product amperage rating by 125%. Minimum fuse amperage provides more protection for the wire but may result in nuisance blows. Example: 80A x 125% = 100A. C Choose FUSE AMPERAGE near the middle of this range.

What is the difference between Class R and Class J fuses?

Class R fuses are available with DC ratings. They have an interrupting rating of 200kA rms symmetrical and are separated into two separate classes, RK1 and RK5. Class J fuses. These non-renewable fuses are current-limiting and conform to 248-8.

What is Type C fuse?

Class C fuses are not dimensionally or electrically interchangeable with other North American fuses. They feature ceramic bodies and bolt-in mounting. They are for short-circuit protection only, in motor controllers, for example, where overload protection is provided by an overload relay.

What are low-peak fuses used for?

Low-Peak fuses can reduce bus bracing; protect circuit breakers with low interrupting rating as well as provide excellent overall protection of circuits and loads.

What are the Class J fuses from Bussmann?

Bussmann’s UL Class J fuse products extend both our Low-Peak family of products with our LPJ_SP and LPJ_SPI dual-element, time-delay fuses as well as our Limitron line offering fast-acting JKS fuses.

How big is an UL Class J Fuse?

These UL Class J products in sizes 1 to 600 amps provide exceptional performance at 600 Vac and 300 Vdc (see spec sheets for specific details) in a compact size rejecting footprint Class J dual element, current-limiting, time-delay fuses are available with optional open fuse indication on select ratings. Video Player is loading.

How many amps does a Class J limitron fuse hold?

Specifications and technical details on the fast-acting Class J Limitron fuses in ratings up to 60 amps, including the 700Vac non-UL versions. Details and technical specifications on the Low-Peak LPJ Class J fuses in ratings of 1 to 60 amps.

Are there any class J low peak fuses?

Low-Peak fuses include Class CC, J, L and RK1 UL branch circuit fuses. Product change notice on fuse labeling for JKS Class J Limitron fuses. Product change notice on fuse labeling for LPJ Class J Low-Peak fuses. Low-Peak fuses provide ultimate protection in the Fuses Made Simple program.