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Approvals & Standards

  • All UL Fusible Disconnect Switches meet UL & CSA requirements
  • UL listed guide WHTY, File E191605 for UL 98 (ratings from 30A to 1200A)
  • IEC 60947-3

Key features & benefits

Mersen’s fusible disconnect switches are listed to UL 98 and bear the CE mark conforming to IEC 60947-3. They are “service entrance” devices capable of fully rated load-break and load-make. While longterm safety, reliability, and functionality are always paramount in the design of our products, these switches are also engineered to have the smallest footprint. The modular design allows placement of the handle anywhere amongst the poles. The fuse doors cannot open when the switch is in the “ON” position, and all switches are double-break, which isolates both fuse clips from voltage during fuse replacement. The switches’ “Test” position allows actuation of the auxiliary contacts without main power. Power taps enable energizing a CPT or surge device without the need for a separate terminal block. A wide range of ergonomic handles and accessories is available.

More specifications


  • Main disconnects
  • Short circuit protection
  • Electrical isolation
  • Overcurrent protection
  • Safety switch

Product Specifications

Item Number


Item Description (ERP)

Switch.fus 100A J R side oper.  

Short Description

Class J Fused Disconnect 600V 100A 3 Pole Side Operated Pole Configuration  



Rated voltage AC UL

600   V

Rated voltage DC UL

250   V

Ampere Rating

100   A

ROHS Compliant


Short Circuit Current Rating (SCCR)

200 kA  

Short Circuit Rating (Standalone)

200   kA

Fuse Type/Class

Class J  

Short Circuit Rating (Class J)

200   kA

Number of Poles


Wiring range


Connection/Terminal Material

Silver-Plated Copper  

Connection/Terminal Type


Max Fuse Rating

100   A

Max Horsepower Rating/FLA

3-Phase: 240V 30HP, 480V 60HP, 600V 75HP  

Contact Type

Double Break  

Rated Insulation Voltage

1000   V

Installation Mounting

Direct Screw Mount  

Product Weight

3.3   lb

Product Width

5.77   in

Product Length

6.77   in

Product Height

4.11   in

Sell Pack Quantity

1   Each

Sell Pack Weight

3.47   lb

Sell Pack Width

7.56   in

Sell Pack Length

6.26   in

Sell Pack Height

9.53   in