Mersen, formerly Ferraz Shawmut US3J, US6J Catalog Page
US3J & US6J UltraSafe™ Class J Fuse Holders
UltraSafe™ modular fuse holders for class J fuses
Mersen UltraSafe Modular 600 Volt Fuse Holders for Class J fuses introduce a new
level of safety and ease for installing or replacing Class J fuses. UltraSafe holders
qualify as “nger-safe” to an IP20 grade of protection under IEC standards. The US3J
accommodates 30A Class J or 22 x 58 mm French Ferrule* fuses. The US6J is for
60A Class J fuses. UltraSafe holders are available in compact 1, 2, or 3 pole units,
with or without blown-fuse indicators in each pole. Multi-pole units can also be made
up in the eld by using the multiple-pole Assembly Kits. All units have provisions for
locking in the open position for safety during fuse changeouts or equipment servicing.
US3J and US6J holders can be snap-mounted to 35 mm DIN-rail and they have a
unique latch which will stay open to allow re-positioning of the holder in the future.
UltraSafe body material is tough and durable polyamide.
*Holder not UL listed when installed with French Ferrule fuses.
Ratings:
Volts : 600VAC/DC
Highlights
• Finger-safe IP20 protection
• Optional indicator lights
• DIN-rail mount
• Compact footprint
• Quick, easy fuse change
Applications:
• 600 volt motors, transformers,
lighting, heating, control circuits,
general loads
• Non-load disconnect
Amps : US3J - 30A Maximum
: US6J - 60A Maximum
SCCR : 200kA
Min. voltage to operate indicator light:
90VAC, 115VDC [Less than 0.7 mA leakage
current at 600V]
Recommended Fuse Usage:
US3J, US6J use with AJT, A4J, HSJ
Approvals:
• UL Listed, guide IZLT File
E52283
• CSA Certied C22.2, class 6225
01, File 32169
• IEC certied 60269-1, 60947-3
H10
US3J & US6J UltraSafe
Catalog Numbers
Catalog
No. W/O
Indicator
Catalog No.
W/ Indicator
Description
TM
Class J Fuse Holders
Voltage Rating
Fuse
Type
AC DC
Ampere
Rating
No. of
Poles
Certifications
US3J1 US3J1I 1-Pole 30A Class J UltraSafe Fuse Holder
US3J2 US3J2I 2-Pole 30A Class J UltraSafe Fuse Holder 2
US3J3 US3J3I 3-Pole 30A Class J UltraSafe Fuse Holder 3
US6J1 US6J1I 1-Pole 60A Class J UltraSafe Fuse Holder
US6J2 US6J2I 2-Pole 60A Class J UltraSafe Fuse Holder 2
US6J3 US6J3I 3-Pole 60A Class J UltraSafe Fuse Holder 3
Class J 600V 600V
30A
60A
Catalog Numbers – Accessories
Accessories
Catalog No.
US3JN 1-Pole Neutral 30A Class J UltraSafe Fuse Holder
US3JPAK Pin Tie Assembly Kit, 6-Poles, for use with US3J
US6JN 1-Pole Neutral 60A Class J UltraSafe Fuse Holder
US6JPAK Pin Tie Assembly Kit, 6-Poles, for use with US6J
Description
Additional specifications:
Terminal screws: Phillips/slot head
Suggested screw torque: 30A - 35 in-lbs. 60A - 45 in-lbs.
Connector type: Pressure plate
Wire range: #2 to #14 (solid/stranded Cu)
Load-break disconnect: No
Dimensions
Dimension
A 32.5 1.28 40 1.57
B 65 2.56 80 3.15
C 97.5 3.84 120 4.72
E 114 4.49 122 4.80
F 3 0.12 3 0.12
G 106 4.17 11 5 4.53
H 80 3.15 89 3.50
I 56 2.20 62 2.44
J 6.5 0.26 6.5 0.26
US3J US6J
mm In mm In
1
UL Listed
1
CSA Approved
IEC Certified
H
H11
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