<h2>Overview</h2>
<p>The Littelfuse FLSR-20-ID is a Class RK5 dual-element time-delay fuse designed for industrial electrical systems and motor circuits. This indicating fuse combines advanced short-circuit protection with overload protection and features visual blown-fuse indication for quick troubleshooting. The FLSR-20-ID series delivers reliable performance in demanding environments, reducing downtime and maintenance costs.</p>
<h2>Key Features</h2>
<ul>
<li>Dual-element time-delay design for motor circuit protection</li>
<li>Visual indicator shows fuse status at a glance—reduces nuisance outages and downtime</li>
<li>Class RK5 rejection-style construction prevents mismatched fuse installation</li>
<li>Rated 20A at 600 VAC / 300 VDC with 200 kA interrupt rating</li>
<li>Solid-state indicator technology for superior reliability</li>
<li>Fiberglass cartridge body for dimensional stability in harsh environments</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Ampere Rating:</strong> 20A</li>
<li><strong>Voltage Rating:</strong> 600 VAC / 300 VDC</li>
<li><strong>Class:</strong> RK5</li>
<li><strong>Type:</strong> Time Delay (Dual Element)</li>
<li><strong>Interrupt Rating:</strong> 200 kA AC, 20 kA DC</li>
<li><strong>Diameter:</strong> 13/16 inch</li>
<li><strong>Length:</strong> 5 inches</li>
<li><strong>Mounting Style:</strong> Rejection cartridge holder</li>
<li><strong>Indication:</strong> Visual blown-fuse indicator</li>
<li><strong>Agency Approvals:</strong> UL 248-12, CSA 1422-02, CE</li>
</ul>
<h2>Typical Applications</h2>
<ul>
<li>Motor branch circuits and motor control centers</li>
<li>Industrial machinery and equipment protection</li>
<li>Power distribution systems where time-delay protection is required</li>
<li>HVAC systems and compressor circuits</li>
<li>General industrial feeder and branch circuit protection</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>Class RK5 rejection-style fuse holders and blocks</li>
<li>Industrial motor control centers and distribution panels</li>
<li>Any circuit rated for 600V, 20A service requiring time-delay protection</li>
<li>Standard North American industrial electrical systems</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Littelfuse FLSR020 (non-indicating version of same amperage and voltage)</li>
<li>Previous-generation Littelfuse Class RK5 20A fuses</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Standard RK5 rejection cartridge fuse holders</li>
<li>Industrial control systems and overcurrent protection schemes</li>
<li>Motor starting and soft-start systems</li>
</ul>
