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Double Throw Switches - Siemens TYPE VBII Series Application Manual

Safety switches
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Double Throw Switches

Description & Application
Double throw safety switches are
intended to transfer loads from one
power source to another. All two- and
three pole double throw switches are
suitable for use as service equipment.
All are UL listed. Switches are rated for
use on systems up to 10,000A when
protected with Class H fuses or
100,000A when protected with Class R
or Class T fuses¡. They can also be used
to connect a single source of power to
either of two loads. In this application it
is necessary to field modify fusible
switches so that the fuses are on the
Double Throw Switches
Number
System
Voltage
of Poles
Heavy Duty Fusible (30-200A with Class H fuse provisions)
2
240
Volt AC
3
or
250
ON
OFF
Volt DC
ON
600
Volt AC,
3
250
Volt DC
Heavy Duty Non-Fusible
2
240
Volt AC
or
250
Volt DC
3
ON
OFF
ON
3
600
Volt AC
or
4 ➄
250
Volt DC
➀ Use HS Type hubs for 30–200A switches; 400A and larger switches do not have hub provisions.
28
➁ All Heavy Duty double throw switches with catalog numbers starting with "DT" are rated 200,000 AIC max. when protected by Class R, J or T fuses.
Fuse ampere rating must not exceed switch ampere rating.
➂ Move load base.
➃ Catalog No. F355SSDTK will accept Class T Fuse only
➄ Four pole switches are not approved for service entrance.
load side of the switching mechanism.
A cover interlock is provided on all
ampere ratings. The operating handle
may be padlocked in the OFF position.
Fuse Capabilities of Fusible Switches
Amp
Rating
30 & 60A, 240V Std Yes (kit) No
30 & 60A, 600V Std Yes (kit) No
100 & 200A
400 & 600A DTF No
Type 1– Indoor
Amps
Catalog Number
200
DTF224
30
DTF321
60
DTF322
100
DTF323
200
DTF324
400
DTF325
600
DTF326
30
DTF361
60
DTF362
100
DTF363
200
DTF364
400
DTF365
30
DTNF221
60
DTNF222
100
DTNF223
200
DTNF224
400
DTNF225
30
DTNF321
60
DTNF322
100
DTNF323
200
DTNF324
400
DTNF325
600
DTNF326
800
DTNF327
30
DTNF361
60
DTNF362
100
DTNF363
200
DTNF364
400
DTNF365
600
DTNF366
800
DTNF367
1200
DTNF368
30
60
100
200
NF454DTK
400
NF455DTK
600
NF456DTK
800
NF457DTK
Fuse Type
H
R
T
J
No
Yes
Std Yes (kit) Yes (kit) Yes
No
Yes
Std
Type 3R – Outdoor➀
Type 12/3R Industrial
Catalog Number
Catalog Number
DTF224R
DTF321R
DTF322R
DTF323R
DTF324R
DTF363R
DTF364R
DTNF224R
DTNF225R
DTNF323R
DTNF324R
DTNF361R
DTNF361J
DTNF362R
DTNF362J
DTNF363R
DTNF363J
DTNF364R
DTNF364J
DTNF365R
NF355HDTK
DTNF366R
DTNF367R
DTNF368R
NFR451DTK
NFR452DTK
NFR453DTK
NFR454DTK
NFR455DTK
NFR456DTK
NFR457DTK
Type 4X – Stainless Steel
Catalog Number
F353SSDTK
F354SSDTK
F355SSDTK ➃
DTNF361S
DTNF362S
DTNF363S
DTNF364S
NF355SSDTK
NF454SSDTK

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