Mersen, formerly Ferraz Shawmut Fuse Reducers Data Sheet

Fuse Reducers

Mersen fuse reducers allow the use of lower rated fuses in existing equipment

having clips with higher ampere ratings. The use of closer rated time-delay fuses can

improve circuit protection. For example, renewable or one-time fuses feeding a motor

can be replaced with fuses sized closer to the motor nameplate current. Non-rejection

reducers will allow Class H, K or R fuses to t Class H or K clips. Rejection-type

reducers will allow only Class R fuses to t Class R clips or only Class J fuses to t

Class J clips. Class J fuse reducers are not for bolt on applications.

Catalog Numbers

Catalog Number

Class H & K

(Non-rejection)

250V

632 R632 - Allows 30A fuse to fit 60A clips

132 R132 - Allows 30A fuse to fit 100A clips

162 R162 - Allows 60A fuse to fit 100A clips

262 R262 - Allows 60A fuse to fit 200A clips

212 R212 - Allows 100A fuse to fit 200A clips

412 R412 - Allows 100A fuse to fit 400A clip

422 R422 - Allows 200A fuse to fit 400A clips

612 R612 - Allows 100A fuse to fit 600A clips

622 R622 - Allows 200A fuse to fit 600A clips

642* R642* - Allows 400A fuse to fit 600A clips

600V

636 R636 J636 Allows 30A fuse to fit 60A clips

162 R162 J136 Allows 30A fuse to fit 100A clips

166 R166 J166 Allows 60A fuse to fit 100A clips

- - J236 Allows 30A fuse to fit 200A clips

266 R266 J266 Allows 60A fuse to fit 200A clips

212 R212 J216 Allows 100A fuse to fit 200A clips

412 R412 J416 Allows 100A fuse to fit 400A clips

422 R422 J426 Allows 200A fuse to fit 400A clips

612 R612 J616 Allows 100A fuse to fit 600A clips

622 R622 J626 Allows 200A fuse to fit 600A clips

642* R642* J646 Allows 400A fuse to fit 600A clips

*Not a pair; rejection end piece only.

Class R

(Rejection)

Class J

(Rejection)

Description

Ratings:

Volts : for 250 and 600V Class

H, K and R fuses

: for 600 Volt Class J

fuses

Amps : 30 to 600A

Tested to 200,000A

J

Approvals:

• UL Listed Guide No. IZZR

• CSA Certied

J3