21 Swg Tinned Copper Fuse Wire

Description

Technical Specifications

According to standard industrial fusing tables (such as IS: 9926), a single strand of 21 SWG tinned copper wire typically performs as follows:

• Approx. Fusing Current: ~58 Amps. This is the peak current where the wire will melt to safely break the circuit.

• Safe Current Rating: 29 Amps to 30 Amps. It is most commonly used as the fusing element in 30A Kit-Kat style porcelain fuse carriers.

• Resistance at 20°C: Approximately 0.033 to 0.035 $\Omega/m$.

• Material: High-conductivity copper with a tin coating, which prevents oxidation and ensures reliable electrical contact in industrial environments.

Common Applications

• 30A Main Circuits: Ideal for sub-main distribution boards in commercial shops or large apartments.

• Heavy Kitchen Appliances: Often used for dedicated lines for commercial ovens, large electric hobs, or industrial dishwashers.

• Control Panel Bridging: Used in industrial control panels where a robust but relatively precise fuse element is required for internal power rails.

Purchasing Options in India

This wire is typically available through industrial wholesalers and is often sold by weight in reels.

The 21 SWG Tinned Copper Fuse Wire is a high-purity industrial-grade option, usually available in 1kg reels. It is designed for consistent performance in porcelain fuse bases.

For lighter industrial use or maintenance kits, you can find the 21 SWG Tinned Copper Wire in various reel sizes. The tin coating ensures that the wire remains free from corrosion even when stored for long periods.

Installation Guidelines

• Terminal Cleaning: Always scrape away any black carbon deposits or oxidation from the brass terminals of the fuse holder. A dirty connection creates heat that can cause the fuse to “nuisance blow” at a current lower than 58A.

• Avoid Stretching: When fitting the wire, do not pull it too tight. Metals expand when hot; leaving a tiny amount of slack prevents the wire from snapping mechanically under high-load conditions.

• Environment: If using this wire in an outdoor or humid setting, the tin coating is critical as it prevents the green “verdigris” corrosion that typically affects bare copper.

[!WARNING]

Safety Check: Never use 21 SWG wire in a standard 5A or 15A household circuit. Since it requires nearly 60 Amps to melt, it will allow standard domestic wiring to overheat and potentially catch fire before the fuse ever blows.