Class R Fuse Blocks - 250V
The Class R Fuse Blocks - 250V is part of the Mersen (formerly Ferraz Shawmut) fuse holders & blocks line, distributed by Gross Automation.

Ferraz Shawmut Class R Fuse Blocks accommodate all Class R power fuses. A choice of screw, pressure plate, box and special order stud connectors fit a wide range of stranded or solid copper or aluminum wire. Insulators are either molded glass-filled polycarbonate (GFPC) or phenolic with verified dielectric strength in excess of 2500V. 30, 60 and 100A fuse blocks feature a unique adder block which can be snapped onto 1-, 2- or 3-pole blocks to form multi-pole segmented blocks of as many poles as desired. All fuse clips are made of high conductivity tin-plated copper, with a choice of spring reinforced or non-spring reinforced clips in 30A and 60A. Clips 100A and above are spring reinforced.
Specifications
| Specification | Value |
|---|---|
| Ratings | AC: 250VAC: 30A, 60A, 100A, 200A, 400A, 600A, Withstand ratings: 200kA; All fuse blocks meet the requirements of UL Std. 512; UL Listed, Guide IZLT, File E52283; UL Recognized Component, Guide IZLT2, File E52283; CSA Certified Class 6225, File 32169; RoHS Compliant |
Ratings
- AC: 250VAC: 30A, 60A, 100A, 200A, 400A, 600A, Withstand ratings: 200kA
- All fuse blocks meet the requirements of UL Std. 512
- UL Listed, Guide IZLT, File E52283
- UL Recognized Component, Guide IZLT2, File E52283
- CSA Certified Class 6225, File 32169
- RoHS Compliant
Catalog Numbers
250 Volt Class R Fuse Blocks, 30 to 600 Ampere
| Amps | Insulator | Poles | Connector Type | Wire Range | Catalog Number (Class R, Spring Reinforced Clips) | Notes |
|---|---|---|---|---|---|---|
| 30 | GFPC | Adder | Box | Al/Cu #2-14 | 20305R+ | |
| 30 | GFPC | 1 | Box | Al/Cu #2-14 | 20306R+ | 1-pole, 30A block does not accept adder pole |
| 30 | GFPC | 2 | Box | Al/Cu #2-14 | 20307R+ | |
| 30 | GFPC | 3 | Box | Al/Cu #2-14 | 20308R+ | |
| 30 | GFPC | Adder | Screw | Cu #10-14 | 20315R+ | |
| 30 | GFPC | 1 | Screw | Cu #10-14 | 20316R+ | 1-pole, 30A block does not accept adder pole |
| 30 | GFPC | 2 | Screw | Cu #10-14 | 20317R+ | |
| 30 | GFPC | 3 | Screw | Cu #10-14 | 20318R+ | |
| 30 | GFPC | Adder | Pressure plate | Cu #10-14 | 20325R+ | |
| 30 | GFPC | 1 | Pressure plate | Cu #10-14 | 20326R+ | 1-pole, 30A block does not accept adder pole |
| 30 | GFPC | 2 | Pressure plate | Cu #10-14 | 20327R+ | |
| 30 | GFPC | 3 | Pressure plate | Cu #10-14 | 20328R+ | |
| 30 | GFPC | Adder | Box | Cu #4-14 | 20355R+ | copper box connectors and clips, for copper wires only |
| 30 | GFPC | 1 | Box | Cu #4-14 | 20356R+ | 1-pole, 30A block does not accept adder pole; copper box connectors and clips, for copper wires only |
| 30 | GFPC | 2 | Box | Cu #4-14 | 20357R+ | copper box connectors and clips, for copper wires only |
| 30 | GFPC | 3 | Box | Cu #4-14 | 20358R+ | copper box connectors and clips, for copper wires only |
| 60 | GFPC | Adder | Box | Al/Cu #2-14 | 20605R+ | |
| 60 | GFPC | 1 | Box | Al/Cu #2-14 | 20606R+ | |
| 60 | GFPC | 2 | Box | Al/Cu #2-14 | 20607R+ | |
| 60 | GFPC | 3 | Box | Al/Cu #2-14 | 20608R+ | |
| 60 | GFPC | Adder | Box | Cu #4-14 | 20655R+ | copper box connectors and clips, for copper wires only |
| 60 | GFPC | 1 | Box | Cu #4-14 | 20656R+ | copper box connectors and clips, for copper wires only |
| 60 | GFPC | 2 | Box | Cu #4-14 | 20657R+ | copper box connectors and clips, for copper wires only |
| 60 | GFPC | 3 | Box | Cu #4-14 | 20658R+ | copper box connectors and clips, for copper wires only |
| 100 | GFPC | Adder | Box | Al/Cu 2/0-#6 | 21035R+ | |
| 100 | GFPC | 1 | Box | Al/Cu 2/0-#6 | 21036R+ | |
| 100 | GFPC | 2 | Box | Al/Cu 2/0-#6 | 21037R+ | |
| 100 | GFPC | 3 | Box | Al/Cu 2/0-#6 | 21038R+ | |
| 100 | GFPC | Adder | Box | Cu 2/0-#12 | 21005R+ | copper box connectors and clips, for copper wires only |
| 100 | GFPC | 1 | Box | Cu 2/0-#12 | 21006R+ | copper box connectors and clips, for copper wires only |
| 100 | GFPC | 2 | Box | Cu 2/0-#12 | 21007R+ | copper box connectors and clips, for copper wires only |
| 100 | GFPC | 3 | Box | Cu 2/0-#12 | 21008R+ | copper box connectors and clips, for copper wires only |
| 200 | Phenolic | 1 | Box, side-clip | Al/Cu 350kcmil-#6 | 22001R+ | |
| 200 | Phenolic | 3 | Box, side-clip | Al/Cu 350kcmil-#6 | 22003R+ | |
| 200 | Phenolic | 1 | Box, side-clip | Cu 350kcmil-#6 | 22051R+ | copper box connectors and clips, for copper wires only |
| 200 | Phenolic | 3 | Box, side-clip | Cu 350kcmil-#6 | 22053R+ | copper box connectors and clips, for copper wires only |
| 400 | Phenolic | 1 | Box, side-clip | Al/Cu 1000-250kcmil | 24001R+ | Not UL Listed or CSA Certified |
| 400 | Phenolic | 3 | Box, side-clip | Al/Cu 1000-250kcmil | 24003R+ | Not UL Listed or CSA Certified |
| 400 | Phenolic | 1 | Box, side-clip | Cu 1000-250kcmil | 24051R+ | Not UL Listed or CSA Certified; copper box connectors and clips, for copper wires only |
| 400 | Phenolic | 3 | Box, side-clip | Cu 1000-250kcmil | 24053R+ | Not UL Listed or CSA Certified; copper box connectors and clips, for copper wires only |
| 400 | Phenolic | 1 | Box, in-line clip | Al/Cu (2) 350kcmil-#4 | 24031R+ | |
| 400 | Phenolic | 3 | Box, in-line clip | Al/Cu (2) 350kcmil-#4 | 24033R+ | |
| 400 | Phenolic | 1 | Box, in-line clip | Cu (2) 350kcmil-#6 | 24061R+ | copper box connectors and clips, for copper wires only |
| 400 | Phenolic | 3 | Box, in-line clip | Cu (2) 350kcmil-#6 | 24063R+ | copper box connectors and clips, for copper wires only |
| 600 | Phenolic | 1 | Box, in-line clip | Al/Cu (2) 500kcmil-#4 | 2631R+ | |
| 600 | Phenolic | 3 | Box, in-line clip | Al/Cu (2) 500kcmil-#4 | 2633R+ | |
| 600 | Phenolic | 1 | Box, in-line clip | Cu (2) 500kcmil-#4 | 2661R+ | copper box connectors and clips, for copper wires only |
| 600 | Phenolic | 3 | Box, in-line clip | Cu (2) 500kcmil-#4 | 2663R+ | copper box connectors and clips, for copper wires only |