Siemens SSRK33 Class R Fuse Rejection Kit 100A

Product Description

The SIEMENS SSRK33 is a Class R fuse rejection kit rated for 100 amps, designed to retrofit standard fuse holders and panelboards to accept only Class R fuses. By physically blocking the installation of non-Class-R fuses, this kit enforces proper fuse selectivity and helps maintain system coordination in branch-circuit and feeder applications. Electricians install this kit to upgrade existing fuse clips or blocks, preventing accidental installation of lower-rated or non-current-limiting fuses that could compromise overcurrent protection.

This rejection kit is suited for use in commercial and industrial electrical distribution panels and disconnect switches where Class R fuse enforcement is required. It is a common field upgrade when existing panelboards must be brought into compliance with current overcurrent protection standards or when a facility standardizes on Class R current-limiting fuses across branch circuits and feeder disconnects.

Key Features

• Enforces Class R fuse-only installation by physically rejecting non-Class-R fuses
• Rated for 100 amps to match the capacity of the fuse block or disconnect being upgraded
• Designed as a retrofit kit for existing fuse holders and panelboard fuse clips
• Supports proper overcurrent protection coordination in branch-circuit and feeder applications

Compatibility

Designed as an OEM-style retrofit for standard fuse holders and disconnect switches requiring Class R fuse rejection at 100 amps. Refer to the Siemens product documentation for specific compatible fuse block and panelboard models.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NFPA 70 (National Electrical Code) requirements for overcurrent protection and fuse selectivity. De-energize and lock out the affected panel or disconnect before beginning any work on fuse clips or blocks. Verify that the ampere rating of the rejection kit matches the fuse block and conductor ampacity before installation. Do not force or modify the rejection inserts, as proper fit is required for the rejection feature to function correctly.

Technical Specifications

• Fuse Class: Class R
• Ampere Rating: 100 amps
• Weight: 0.022 pounds
• UPC: 78364317748

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: SSRK33