Application Data for Double Throw Safety Switches
This application and short-circuit current rating (SCCR)
information for double-throw safety switches used in commercial and
industrial electrical systems covers fuse requirements, recommended
installation configurations, basic system wiring diagrams, and UL
Listed SCCR values. The data spans multiple switch series, fuse classes,
and voltage ratings, with available SCCR ratings up to 200 kA, depending
on the switch type and overcurrent protection method.
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 and 600 Volt Double Throw Safety Switches which have provisions for accepting fuses. - 30 A, 200–600 A Type 82,000 (Series E, T4, A), DTU devices:
Use the non-fusible double throw switches from 240 Volt Double-Throw Safety Switches and 600 Volt Double Throw Safety Switches in conjunction with standard fusible devices, and install them according to diagram 1 or 2, below.
UL Listed Short Circuit Current Ratings
|
Switch Type |
Amperes |
Voltage Rating |
UL Listed Fuse Class |
Short Circuit (A) |
|---|---|---|---|---|
|
Type 92000 |
30 A |
240 V |
H, K |
10,000 [2] |
|
Type DT (Series F) |
30–100 A |
240 V or 600 V |
H, K |
10,000 |
|
R, J |
200,000 |
|||
Type DTU [3] (Series F) |
30–100 A |
240 V or 600 V |
H or K |
10,000 [2] |
|
R, J or T |
200,000 |
|||
|
and (Series E) |
200 A |
240 V |
H, K |
10,000 [2] |
|
(Series E) |
200 A |
240 V |
H, K |
10,000 [2] |
|
R, J |
100,000 |
|||
|
Type 82,000 |
All |
240 V or 600 V |
H, J |
10,000[2] |
|
Type DTU (Series A) |
400–600 A |
240 V or 600 V |
H, K |
10,000 |
|
R, J, T |
100,000 |