Littelfuse SLO030 SLO Series 3...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$10.24
Littelfuse SLO030 SLO Series 30A Type S Time-Delay Plug Fuse

Littelfuse SLO030 SLO Series 30A Type S Time-Delay Plug Fuse

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Model: SLO030

In Stock (leaves warehouse same day if ordered before 3pm ET)

$10.24
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Littelfuse SLO030 SLO Series 30A Type S Time-Delay Plug Fuse

The Littelfuse SLO030 SLO Series is a 30A, 125VAC Type S time-delay plug fuse engineered for reliable overcurrent protection in residential and light commercial fuse panels. Featuring a Medium-Acting/Medium Time Lag/Medium Time Delay opening characteristic, this plug fuse allows momentary overloads such as motor-starting inrush current and temporary appliance surges to pass without nuisance opening, while still protecting branch-circuit wiring from sustained overcurrents. With a 10,000A interrupting rating at 125VAC, the SLO030 delivers dependable fault-current interruption for demanding electrical applications, making it a trusted, code-compliant replacement fuse for existing Type S fuse panels in homes and light commercial buildings.

Key Features

  • Ampere Rating: 30A rating suited for branch-circuit, appliance, and general overcurrent protection.
  • Voltage Rating: 125VAC for standard residential and light commercial fuse panels.
  • Time-Delay Opening: Medium-Acting/Medium Time Lag/Medium Time Delay characteristic tolerates temporary inrush and motor-starting currents without nuisance blowing, reducing unnecessary fuse replacement.
  • Interrupting Rating: 10,000A @ 125VAC for dependable clearing of high fault currents and added circuit safety margin.
  • Type S Base: Type S-style base construction helps prevent installation of an oversized, mismatched fuse, supporting proper circuit protection coordination.
  • Package Format: Plug Fuse package size for direct, screw-in installation into compatible Type S fuse panels.

Technical Specifications

  • VAC (V): 125
  • Ampere Rating (A): 30
  • Opening: Medium-Acting/Medium Time Lag/Medium Time Delay
  • Interrupting Rating: 10000A@125VAC
  • Package Size: Plug Fuse
  • Series: SLO

Typical Applications

  • Residential Fuse Panel Circuit Protection
  • Light Commercial Branch-Circuit Protection
  • Motor and Appliance Circuits Requiring Time-Delay Protection
  • Type S Fuse Panel Replacement and Upgrades
  • General Overcurrent Protection on 125VAC Circuits
  • Maintenance and Retrofit of Existing Plug-Fuse Panels

Why Littelfuse?

Littelfuse is a recognized name in circuit protection, and the SLO Series plug fuse reflects that focus with a 10,000A interrupting rating and Type S base construction built for dependable, code-compliant performance. The medium time-delay opening characteristic is engineered specifically to ride through normal motor-starting and appliance inrush events, helping installers and homeowners avoid nuisance fuse replacements while maintaining protection against genuine overcurrent conditions. For professionals and homeowners replacing 30A, 125VAC Type S fuses, the Littelfuse SLO030 offers a reliable, drop-in overcurrent protection solution for existing fuse panels.

Product Specs

Product Type:
Plug Fuse
Voltage Rating:
125VAC
Amperage Rating:
30A
Series:
SLO
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse SLO030 – Frequently Asked Questions

1) Will a Littelfuse SLO030 screw into my existing fuse box, or do I need an adapter first?
The SLO030 is a Type S fuse, so it only threads into a Type S adapter, not directly into a plain Edison-base (Type T) socket. If your panel still has the old Edison screw shells, you install a 30A Type S adapter into the socket first, then the SLO030 threads into that. Once the adapter is in, it is permanent and will only accept the matching 30A rejection base, which is the whole point of the Type S design: nobody can later drop a 30A fuse into a 15A circuit.
2) My 30 amp fuse keeps blowing when the well pump or AC compressor starts. Will a time-delay plug fuse fix that?
That is exactly what the SLO030 is built for. It has a Medium-Acting/Medium Time Lag opening characteristic, so motor-starting inrush and short appliance surges pass through without opening the fuse, while sustained overcurrent still clears. A fast-acting plug fuse on a motor circuit will nuisance-blow on every start. Note this does not license you to go up in size: if a 30A fuse is blowing on a 30A-rated circuit, the fuse type is the fix, not a bigger amp rating.
3) Can I use a 125VAC plug fuse like the SLO030 on a 240 volt circuit such as a dryer or water heater?
No. The SLO030 is rated 125VAC only, so it belongs on 120V branch circuits. Two-pole 240V loads (dryers, ranges, water heaters, well pumps on 240V) are protected by cartridge fuses in a pullout block, not Type S plug fuses. Using a 125V fuse across a 240V circuit risks the fuse failing to interrupt the arc.
4) Is a 30A Type S plug fuse the right size for a standard 15 or 20 amp lighting and receptacle circuit?
No, and this is the most common ordering mistake on plug fuses. A 30A fuse is matched to 10 AWG branch wiring. General lighting and receptacle circuits wired in 14 AWG take a 15A fuse and 12 AWG circuits take a 20A fuse. Fuse the circuit to the conductor, not to the load that keeps tripping. If your panel's circuit directory or the old fuse says 15 or 20, order that rating in the SLO series instead of the SLO030.
5) What does the 10,000A interrupting rating on the Littelfuse SLO030 actually mean for my panel?
It is the maximum fault current the fuse can safely clear at 125VAC. At 10,000A, the SLO030 covers the available fault current found at typical residential and light commercial fuse panels with margin, so a dead short on the branch circuit is interrupted inside the fuse rather than becoming an arcing failure in the panel. Older low-interrupting plug fuses are what you are replacing when you specify this one.
6) I manage older apartment buildings with fuse panels. Can I standardize on these for maintenance stock?
Yes, for the 120V branch circuits in Type S panels. The SLO030 is the 30A rating in the Littelfuse SLO series, and the series runs the common plug-fuse amperages, so a maintenance crib can carry one series across the 15A, 20A and 30A sockets in the same buildings. Keeping Type S bases throughout also stops tenants or handymen from fitting an oversized fuse once the adapters are in.
7) Is the SLO030 a fast-acting or dual-element fuse, and does it matter which I put in a Type S adapter?
It is a time-delay (medium time lag) fuse, not fast-acting. Both types share the same Type S base and will thread into the same 30A adapter, so the panel will not stop you from using the wrong characteristic. On motor and appliance circuits, use the time-delay SLO030. Fast-acting plug fuses suit purely resistive loads but will open on inrush the moment a compressor or pump starts.
8) What is the exact part number to order for a 30 amp Littelfuse Type S time-delay plug fuse?
Order Littelfuse SLO030. That is the manufacturer part number for the 30A, 125VAC Type S time-delay fuse in the SLO series. The amp rating is carried in the last three digits of the number, so the family reads consistently across ratings.
How fast can I get the Littelfuse SLO030 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse SLO030 come with a warranty?
Absolutely. The Littelfuse SLO030 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse SLO030?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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