Energy Guide
3-30
© 2019 Schneider Electric
All Rights Reserved
Double Throw Safety Switches
Application Data
www.se.com/us
Class 3110 / Refer to Catalog 3100CT1602
Application Data for Double Throw Safety Switches
Situations Requiring Fuses
30–100 A Type DT (Series F):
Select DT switches from 240 Volt Double-Throw Safety Switches, page 3-26 and 600
Volt Double Throw Safety Switches, page 3-27 which have provisions for accepting
fuses.
30 A, 200–600 A Type 82,000 (Series E, T4, A), all DTU devices:
Use the non-fusible double throw switches from 240 Volt Double-Throw Safety Switches,
page 3-26 and 600 Volt Double Throw Safety Switches, page 3-27 in conjunction with
standard fusible devices, and install them according to diagram 1 or 2, below.
Diagram 1
Diagram 2
Line
Line
Non-Fusible
Double Throw
Switch
Load
Fusible Single
Throw Switch
or Circuit
Breaker
Line
Line
Load
Fusible
Single Throw
Switch or
Circuit
Breaker
Fusible
Single Throw
Switch or
Circuit
Breaker
Non-Fusible
Double
Throw
Switch
Table 3.54: UL Listed Short Circuit Current Ratings
Switch Type Amperes
Voltage
Rating
UL Listed
Fuse Class
Short Circuit
Current Rating [43]
(A)
Type 92000
30 A 240 V
H, K
10,000
[44]
Type DT
(Series F)
30–100 A
240 V or
600 V
H, K 10,000
R, J 200,000
Type DTU [45]
(Series F)
30–100 A
240 V or
600 V
H or K
10,000
[44]
R, J or T 200,000
DTU224NRB and
DTU324NRB
(Series E)
200 A 240 V
H, K
10,000 [44]
DTU324N
(Series E)
200 A 240 V
H, K
10,000 [44]
R, J 100,000
Type 82,000
All
240 V or
600 V
H, J
10,000[44]
Type DTU
(Series A)
400–600 A
240 V or
600 V
H, K 10,000
R, J, T 100,000
3
SAFETY SWITCHES
[43] Rating applies to AC only. The UL Listed short circuit current rating for non-fusible switches is based on the switch being used in conjunction with the corresponding fuse type. Evaluation of
non-fusible switches in conjunction with molded case circuit breakers has not been performed.
[44] Any brand of circuit breaker or fuse not exceeding the ampere rating of the switch may be used ahead of a non-fusible safety switch when there is up to 10 kA short circuit current available.
[45] The DTU361 and DTU361RB are also suitable for use on a circuit capable of delivering not more than
(A) 18 kA, 600 Vac maximum when protected by Type FH circuit breaker rated 30 A maximum or
(B) 14 kA, 600 Vac maximum when protected by Type FA circuit breaker rated 30 A maximum.
9/13/2019