Product Overview
Archer 2.5 Amp 125V Fast-Acting 5x20mm Miniature Glass Cartridge Fuses
Condition
Unused new old stock (NOS) in sealed original retail blister packaging. Card markings: Archer Cat. No. 270-1245, 20mm FUSES (2) 2.5 AMPS, U.L. APPROVED-125VAC. Ferrule end caps stamped with CSA certification mark. Sold as a card of two fuses.
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Product Overview
Archer catalog number 270-1245 supplies two 2.5-amp, 125-volt fast-acting glass cartridge fuses custom manufactured in Japan for Radio Shack. Built in the standard 5x20 mm miniature form factor with nickel-plated cylindrical ferrule end caps and a clear glass body, these fuses provide overcurrent protection for vintage electronics, audio gear, power supplies, and bench test equipment.
Key Features
- Current rating: 2.5 A
- Voltage rating: 125 VAC (UL approved)
- Dimensions: 5 mm diameter by 20 mm length
- Body construction: Clear glass cylindrical cartridge
- Termination: Ferrule end caps
- Agency approvals: UL listed, CSA certified
- Quantity: 2 fuses per package
- Country of origin: Custom manufactured in Japan for Radio Shack / Tandy Corporation
Applications
- Replacing blown power line fuses in vintage stereo receivers and tube audio gear.
- Servicing secondary power supplies and bench test instruments requiring 5x20 mm protection.
- Fusing hobbyist power supplies and custom maker electronics built around 20 mm panel holders.
Frequently Asked Questions
What is the physical size of these fuses?
These fuses measure 5 mm in diameter by 20 mm in overall length, which is the standard 5x20 mm miniature cartridge format.
What is the clearing speed of this fuse series?
These are standard fast-acting glass cartridge fuses designed to open rapidly during overcurrent conditions.
Can a 20 mm fuse fit into a 1-1/4 inch automotive fuse holder?
No. A 20 mm fuse is significantly shorter and narrower than standard 1-1/4 inch (6.3x32 mm or 3AG) fuses and requires dedicated 5x20 mm clips or fuse holders.
There is something reassuring about a genuine Japanese-made Radio Shack blister pack from the golden era of the neighborhood parts bench. Keep these on your shelf and you will never find yourself stranded by a blown two-and-a-half-amp rail.
