B 30
APPLICATIONS:
➤Feeders
➤Branch Circuits
➤Resistive Heating
➤Residential and Small
Commercial
Installations
➤OT
AC: 1 to 600A
250VAC, 50kA I.R.
➤OTN (Canada)
AC: 15 to 60A
250VAC, 50kA I.R.
➤OTS
AC: 1 to 600A
600VAC, 50kA I.R.
ONE-TIME
OT/OTN/OTS CLASS K-5
Ratings
Features/Benefits
➤Easy to read imprint label for quick recognition and
replacement
➤Low cost for high protection value
FOR VERSATILITY AND ECONOMY, THESE
GENERAL PURPOSE FUSES ARE HARD TO
BEAT
OT, OTN and OTS general purpose fuses provide
low cost protection for feeder and branch circuits
serving lighting, heating, and other non-motor
loads. OT, OTN and OTS fuses will safely interrupt
available short circuit currents up to 50,000
amperes in all ratings.
OT, OTN and OTS fuses are not rejection fuses –
care should be taken to ensure that replacement
fuses do not have lower interrupting ratings than
original fuses.
OTN 15 through 60 satisfy the Canadian electrical
code requirement for Type “P,” low melting-point,
non-time delay fuses.
➤UL Listed to
Standard 248-9
➤CSA Certified to
Standard C22.2
No. 248.9*
*The Canadian Electrical
Code requires these
fuses in ratings 15
through 60A to be
of the low melting
point design use
OTN 15-60.
Approvals
HIGHLIGHTS:
➤Versatile
➤Lowest cost protection
for circuits serving
non-inductive loads
B 31
PF
GENERAL PURPOSE / CLASS K-5 FUSES OT/OTN/OTS
ONE-TIME
Ampere Catalog Number Ampere Catalog Number Ampere Catalog Number
Rating 250V 600V Rating 250V 600V Rating 250V 600V
1 OT1 OTS1 30 OT30, OTN30* OTS30 125 OT125 OTS125
2 OT2 OTS2 35 OT35, OTN35* OTS35 150 OT150 OTS150
3 OT3 OTS3 40 OT40, OTN40* OTS40 175 OT175 OTS175
4 OT4 OTS4 45 OT45, OTN45* OTS45 200 OT200 OTS200
5 OT5 OTS5 50 OT50, OTN 50* OTS50 225 OT225 OTS225
6 OT6 OTS6 60 OT60, OTN60* OTS60 250 OT250 OTS250
7 OT7 OTS7 65 OT65 OTS65 300 OT300 OTS300
8 OT8 OTS8 70 OT70 OTS70 350 OT350 OTS350
10 OT10 OTS10 75 OT75 OTS75 400 OT400 OTS400
12 OT12 OTS12 80 OT80 OTS80 450 OT450 OTS450
15 OT15, OTN15* OTS15 90 OT90 OTS90 500 OT500 OTS500
20 OT20, OTN20* OTS20 100 OT100 OTS100 600 OT600 0TS600
25 OT25, OTN 25* OTS25 110 OT110 OTS110
Standard Fuse Ampere Ratings, Catalog Numbers
AMPERE A B C D E
RATING In. mm In. mm In. mm In. mm In. mm
250V-OT, OTN FUSES
0-30 2 51 9/16 14 - - - - - -
31-60 3 76 13/16 21 - - - - - -
61-100 5-7/8 149 1-1/16 27 1/8 3 3/4 19 1 25
101-200 7-1/8 181 1-9/16 40 3/16 5 1-1/8 28 1-3/8 35
201-400 8-5/8 219 2-1/16 53 1/4 6 1-5/8 41 1-7/8 48
401-600 10-3/8 264 2-9/16 66 1/4 6 2 51 2-1/4 57
600V-OTS FUSES
0-30 5 127 13/16 21 --- - - -
31-60 5-1/2 139 1-1/16 27 --- - - -
61-100 7-7/8 200 1-5/16 34 1/8 3 3/4 19 1 25
101-200 9-5/8 244 1-13/16 46 3/16 5 1-1/8 28 1-3/8 35
201-400 11-5/8 295 2-9/16 66 1/4 6 1-5/8 41 1-7/8 48
401-600 13-3/8 340 3-1/8 80 1/4 6 2 51 2-1/4 57
Dimensions
Fuse Catalog Number
Ampere 250V 600V
Rating 1 Pole 3 pole 1 pole 3 pole
0-30 20306 20308 60306 60308
31-60 20606 20608 60606 60608
61-100 21036 21038 61036 61038
101-200 22001 22003 62001 62003
201-400 24001 24003 64001 64003
401-600 2631 2633 6631 6633
Recommended Fuse Blocks With Box
Connectors For One-Time Class K-5 Fuses
A variety of pole configurations and termination provisions
is available. Refer to the fuse block section of this catalog
for details.
61-600A
0-60A
* In Canada
B
Maximum Instantaneous Peak Let-Thru Amperes
Available Current in RMS Symmetrical Amperes
Peak Let-Thru Current Data – OT, OTN & OTS30 to 600, 250 and 600 Volts AC
B 32
GENERAL PURPOSE / CLASS K-5 FUSES OT/OTN/OTS
ONE-TIME
Time in Seconds
Current in Amperes
Current in Amperes
Time in Seconds
Melting Time – Current Data, 250V Fuses
OT30 to 600; OTN 30, 60
OTS30 to 600
Melting Time – Current Data, 600V Fuses
