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Littelfuse SLC Series Class G Time-Delay Cartridge Fuse, 480VAC
The Littelfuse SLC Series is a line of compact Class G time-delay cartridge fuses rated 480VAC, available in ampere ratings from 6A to 50A to match branch-circuit protection needs across industrial and commercial electrical systems. Each fuse in the series delivers a medium time-delay opening characteristic (medium-acting/medium time lag/medium time delay) that reduces nuisance downtime caused by harmless power surges or equipment inrush demands, backed by a 100,000 ampere interrupting rating (A.I.R.) for reliable protection against high fault currents at 480VAC. The series' current-limiting, compact Class G dimensions prevent insertion into lower-voltage fuse holders, and fuse length varies by ampere rating so higher-rated fuses cannot be substituted into holders sized for lower ratings, supporting safe, code-compliant branch-circuit design across the full SLC lineup.
Key Features
- Ampere Rating Range: Available from 6A to 50A so installers can match actual equipment load requirements without greatly oversizing for harmless surges.
- Voltage Rating: 480VAC rating suited for industrial and commercial branch-circuit applications.
- Medium Time-Delay Opening: Medium-acting/medium time lag/medium time delay characteristic reduces downtime caused by power surges or equipment inrush demands.
- High Interrupting Rating: 100,000 A.I.R. provides reliable interruption of overcurrents up to 100,000 amperes at 480VAC.
- Current-Limiting Design: Current-limiting construction reduces equipment damage caused by the heating and magnetic effects of short-circuit currents.
- Compact Class G Construction: Unique SLC series dimensions prevent insertion of lower-voltage fuses into Class G fuse holders, and fuse length varies by ampere rating to prevent insertion of higher ampere-rated fuses into holders designed for lower ratings.
- Package Size: Industrial Cartridge construction sized for standard Class G fuse holders.
Certifications & Compliance
- UL Recognized Component (File E81895)
- CSA Certified (1422-02, File 029862)
- CE Marked
Technical Specifications
- Series: SLC
Typical Applications
- Branch-Circuit Overcurrent Protection
- Industrial and Commercial Electrical Systems
- Class G Fuse Holders and Panelboards
- Motor and Equipment Circuit Protection
- System Upgrades Replacing Standard Class G Fuses
Why Littelfuse?
Littelfuse engineers the SLC Series with current-limiting, medium time-delay technology and a 100,000 A.I.R. interrupting rating across its full 6A-50A range, giving electrical professionals a compact Class G fuse family built for reliable, code-compliant branch-circuit protection. With UL recognition, CSA certification, and CE marking referenced in Littelfuse's documentation, the SLC Series delivers the dependable, current-limiting overcurrent protection performance professionals expect from Littelfuse.
Manufacturer Resources
Spec Sheet
Product Specs
- Series:
- SLC
- Product Type:
- Time-Delay Fuse
- Voltage Rating:
- 480VAC
- Amperage Rating:
- 6A - 50A
- Listing:
- UL Recognized Component
- Standards:
- CSA Certified
- Department:
- Electrical
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuses
Littelfuse SLC006 – Frequently Asked Questions
1) Will a Littelfuse SLC fuse fit my existing Class G fuse holder?
The SLC Series is built to standard Class G cartridge dimensions, so it drops into Class G holders and panelboards. One catch: Class G length varies by ampere rating, and the SLC follows that, so a 30A fuse will not physically go into a holder sized for a lower rating. Match the amp rating of the holder to the fuse, not just the class.
2) Is the SLC fuse rated for a high available fault current panel?
Yes. The SLC carries a 100,000 ampere interrupting rating at 480VAC, and the element is current-limiting, so it cuts the let-through energy and reduces the heating and magnetic damage a short circuit puts into downstream equipment.
3) Can I swap a Class G SLC fuse for a Class RK1 fuse like the Mersen A2K or A2D?
No. Class G and Class RK1 are different physical classes with different holder and block dimensions, so they do not interchange. The Mersen A2K Series is a fast-acting Class RK1 fuse rated 250V, and the Mersen A2D-R is a Class RK1 time-delay with SmartSpot blown-fuse indication. Pick those if your equipment is fitted with RK1 clips or a rejection block; stay with the SLC if the holder is Class G.
4) We are replacing standard Class G fuses in an older panelboard. Is the SLC a direct upgrade?
Yes, system upgrades replacing standard Class G fuses are one of the SLC's intended uses. You get the same Class G holder fit plus a current-limiting, 100,000 A.I.R. element at 480VAC. Keep the amp rating identical to what came out, because Class G length is tied to rating and a higher-rated SLC will not enter the smaller holder.
5) Can a Mersen A2D-R Class RK1 time-delay fuse replace a Littelfuse SLC Class G fuse?
No. Both are time-delay fuses, but they are different UL fuse classes with different bodies. The Littelfuse SLC is a Class G time-delay cartridge fuse rated 480VAC in 6A through 50A, and its compact Class G dimensions are deliberately sized so it only fits Class G holders, with length varying by ampere rating. The Mersen A2D-R is a Class RK1 time-delay fuse with SmartSpot indication, built to rejection-style Class R dimensions for Class R fuse blocks. If the panel has Class G holders, stay with the SLC; if the holders are Class R, the A2D-R is the time-delay choice.
6) Which fuse should I pick for a motor circuit that trips fuses on startup?
Motor inrush calls for a time-delay characteristic. The Littelfuse SLC Series is a medium time-delay Class G fuse rated 480VAC from 6A to 50A with a 100,000A interrupting rating, intended for motor and equipment circuit protection in Class G holders. If the equipment uses Class R fuse blocks instead, the Mersen A2D-R is a Class RK1 time-delay fuse. Fast-acting options such as the Mersen A2K Series are built for the opposite behavior and are not the choice for an inrush problem.
7) Can I use a 480V Class G fuse like the SLC in a 277V or 300V Class G circuit?
The SLC is rated 480VAC, and a fuse may be applied at or below its voltage rating, so it will protect lower-voltage circuits electrically. The physical side is deliberately restrictive: the SLC's dimensions prevent lower-voltage Class G fuses from being inserted into Class G holders intended for the 480V parts, which is how the series keeps a 300V fuse out of a 480V position.
8) Which amp ratings does the Littelfuse SLC Class G fuse come in?
The SLC family spans 6A through 50A. Orderable ratings are 6A (SLC006), 20A (SLC020), 30A (SLC030), 35A (SLC035) and 50A (SLC050). Size to the actual equipment load rather than oversizing to ride through inrush, since the time-delay element already handles that.
9) Are Littelfuse SLC fuses UL and CSA approved for a commercial panel?
The SLC is a UL Recognized Component under file E81895, CSA Certified (1422-02, file 029862), and CE marked. That covers the paperwork most commercial and industrial inspection and spec work asks for on branch-circuit fuses.
10) I need a time-delay fuse but my gear uses R-class clips. What should I order instead of the SLC?
Go to the Mersen A2D-R, a Class RK1 time-delay fuse with SmartSpot indication, which gives you the same ride-through behaviour as the SLC in an R-class body and shows you at a glance which fuse has opened. For fast-acting RK1 instead, the Mersen A6K-R Series (for example A2K12R) is the counterpart.
11) I need a fast-acting fuse instead of the time-delay Littelfuse SLC - what are the options?
The SLC Series is a medium time-delay fuse, so it rides through motor inrush and harmless surges rather than clearing them. For circuits where you want fast clearing instead, Mersen offers the Amp-Trap A2K Series, a fast-acting Class RK1 fuse rated 250V, and the A2K12R in the A6K-R Series, also a Class RK1 fast-acting fuse. Both are Class RK1 rather than Class G, so confirm the holder accepts Class R dimensions before you order.
12) Is the Mersen D0R0 Amp-Trap E-rated fuse an alternative to the Littelfuse SLC for branch-circuit protection?
No, they serve different parts of the system. The Littelfuse SLC is a 480VAC Class G cartridge fuse for branch-circuit overcurrent protection in commercial and industrial panelboards. The Mersen A055F1D0R0-150E is an E-rated medium voltage fuse with ferrule terminals, intended for medium voltage circuits such as transformer and feeder protection, not for a 480V Class G branch-circuit holder.
13) Is the SLC a medium-voltage fuse like the Mersen D0R0 Amp-Trap?
No. The SLC is a low-voltage branch-circuit fuse rated 480VAC for panelboards and equipment circuits. The Mersen D0R0 Series Amp-Trap is an E-rated medium voltage fuse with ferrule terminals, used in transformer and medium voltage switchgear applications. They are not substitutes for each other.
14) Will a Square D PowerLogic meter fuse pack work in place of a Littelfuse SLC fuse?
No. The Square D PowerLogic Energy Meter Fuse Pack is a set of three 0.5A 600V fuses used to protect metering voltage inputs, a control-level application. The Littelfuse SLC Series covers 6A to 50A at 480VAC for branch-circuit and equipment protection in Class G holders. The two are not interchangeable in either direction.
How fast can I get the Littelfuse SLC006 delivered?
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Does the Littelfuse SLC006 come with a warranty?
Absolutely. The Littelfuse SLC006 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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