CA08101001E For more information visit: www.cutler-hammer.eaton.com
8-13
Safety Switches & Enclosed Circuit Breakers
January 2003
8
Safety Switches
Short Circuit Ratings
Vol. 1, Ref. No. [0251]
General Duty
Table 8-34. Short Circuit Ratings Using Class “R”, “J” or “T” Fusing where Applicable
Note: Class “H” fuse clips supplied as standard for 30 – 600 amperes.
Rated at 10,000 rms symmetrical when using Class “H” fuses.
Heavy Duty
Table 8-35. Short Circuit Ratings Using Class “R”, “J” or “T” Fusing where Applicable
Note: Class “H” fuse clips supplied as standard for 30 – 600 amperes. Rated at 10,000 rms
symmetrical when using Class “H” fuses.
Double Throw
Table 8-36. Short Circuit Ratings Using Class “R”, “J” or “T” Fusing where Applicable
Note: Class “H” fuse clips supplied as standard for 30 – 600 amperes except Class “T” for
400 amperes at 600 volts and 600 amperes at 240 volts. Rated at 10,000 rms symmetrical
when using Class “H” fuses.
Ampere
Rating
Voltage Ratings
Type 1 Type 3R
30
60
100
200
400
600
100k at 240
100k at 240
100k at 240
100k at 240
100k at 250
100k at 250
100k at 240
100k at 240
100k at 240
100k at 240
100k at 250
100k at 250
Ampere
Rating
Voltage Ratings
Type 1 Type 3R Type 12 Type 4 and 4X
30 200k at 600 200k at 600 200k at 600 200k at 600
60 200k at 600 200k at 600 200k at 600 200k at 600
100 200k at 480
100k at 600
200k at 480
100k at 600
200k at 600 200k at 600
200 200k at 600 200k at 600 200k at 600 200k at 600
400 200k at 480
100k at 600
200k at 480
100k at 600
200k at 480
100k at 600
200k at 480
100k at 600
600 200k at 480
100k at 600
200k at 480
100k at 600
200k at 480
100k at 600
200k at 480
100k at 600
800 200k at 480
100k at 600
200k at 480
100k at 600
200k at 480
100k at 600
200k at 480
100k at 600
1200 200k at 600 200k at 600 — —
Ampere
Rating
Voltage Ratings
Type 1 Type 3R Type 12 Type 4 and 4X
30
60
100
200
400
600
800
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
—
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
100k at 600
—
Non-Fusible Switches
The UL listed short circuit ratings for
Cutler-Hammer Non-Fusible switches
by Eaton Corporation are based on the
switches being properly protected by
overcurrent protective devices. For
applications that require a UL listed
short circuit rating of 10,000 rms sym-
metrical amperes or less, a Cutler-
Hammer Non-Fusible switch must be
properly protected by any overcurrent
protective device rated no greater than
the ampere rating of the switch. For
applications that require a UL listed
short circuit rating of greater than
10,000 rms symmetrical amperes, a
Cutler-Hammer Non-Fusible switch
must be properly protected by the
appropriate class and size fusing noted
on the switch publication (located on
the inside cover). Otherwise, this Non-
Fusible switch must be replaced
with a Cutler-Hammer Fusible switch
that utilizes the appropriate fusing
required. Molded case circuit breaker
protection of Non-Fusible Cutler-
Hammer switches for applications that
require a short circuit rating of greater
than 10,000 rms symmetrical amperes
has not been evaluated. Refer to the
reference tables for typical Cutler-
Hammer fusible switch UL listed
short circuit ratings.
Note: Safety switch short circuit ratings are
applicable to AC only.
Note: Safety switch l
2
t and lp values are
identical to UL maximum acceptable l
2
t and
lp values for the corresponding class fuse.
