Double-throw heavy-duty

switching neutral safety switches

Double-throw heavy-duty

non-fusible safety switches

Double-Throw Switching Neutral

Safety Switch

(upper switch base assembly

is shown)

Double-Throw 600 Vac Heavy-Duty, Non-Fusible

Ampere

Rating

Main and

Standby

Maximum Horsepower Ratings

NEMA 1

Enclosure

Indoor

NEMA 3R

Enclosure

Rainproof

NEMA 12

Enclosure

Industrial,

Dust-Tight

NEMA 4X

Enclosure, Corrosion-Resistant,

Stainless Steel

Single-Phase

Three-Phase

480 Vac 600 Vac 480 Vac 600 Vac 480 Vdc

Catalog

Number

Catalog

Number

Catalog

Number

Catalog

Number

Two-Pole—600 Vac—250 Vdc

30

60

100

200

400

600

7-1/2

20

40

50

—

—

10

25

50

50

—

—

—

—

—

—

—

—

—

—

—

—

—

—

5

10

20

40

50

50

DT261UGK

DT262UGK

DT263UGK

DT265UGK

DT266UGK

—

—

—

DT265URK

DT266URK

—

—

—

—

—

—

—

—

—

—

—

—

Three-Pole—600 Vac—250 Vdc

30

60

100

200

400

600

800

800

7-1/2

20

40

50

—

—

—

—

10

25

50

50

—

—

—

—

20

50

75

125

250

250

250

250

30

60

100

150

350

350

350

350

5

10

20

40

50

50

50

50

DT361UGK

DT362UGK

DT363UGK

DT364UGK

DT365UGK

DT366UGK

DT367UGK-N

DT361URK

DT362URK

DT363URK

DT364URK

DT365URK

DT366URK

DT367URK-N

DT361UWK

DT362UWK

DT363UWK

DT364UWK

DT365UWK

—

—

—

30

60

100

200

400

600

800

7-1/2

20

40

—

—

—

—

10

25

50

50

—

—

—

20

50

75

125

250

250

250

30

60

100

150

350

350

350

5

10

20

40

50

50

50

—

—

—

DT464UGK

DT465UGK

DT466UGK

DT467UGK

DT461URK

DT462URK

DT463URK

DT464URK

DT465URK

DT466URK

DT467URK

—

—

—

—

—

—

—

—

—

—

—

—

—

—

30

60

100

7-1/2

20

40

10

25

50

15

50

75

30

60

100

5

10

20

—

—

—

DT661URK

DT662URK

DT663URK

—

—

—

—

—

—

A

Rated 600 Vdc, 50 hp in addition to ratings shown in table.

B

Warning: Switch is not approved for service entrance.

C

Field-installable neutral kit is not available. If a neutral is required, order the catalog number shown in the table with “

N” suffix.

D

NEMA12enclosures(30–800A)canbefieldmodifiedtomeetNEMA3Rrainproofrequirementswhenafactory-provideddrainholeisopened.

E

Also available in 240 Vac, catalog number

DT325UDK.

ON

OFF

ON

Non-Fusible

Two-Pole

Two Sources or

Two Loads

ON

OFF

ON

Non-Fusible

Four-Pole

Two Sources or

Two Loads

Bonding kit schematic

Single-phaseapplicationsrequiringaneutralpolebondingkit

Bonding kit schematic

Three-phaseapplicationsrequiringaneutralpolebondingkit

otess:

N

NEC 702 application, separately derived system

and service equipment.

Two sources with switched neutral,

generator is a separately derived system.

Proper installation is governed by interpretation of the NEC,

applicable local codes and local utility requirements. Applicable

sections of these codes and requirements should be

referenced prior to installation.

ON

OFF

ON

Non-Fusible

Three-Pole

Two Sources or

Two Loads

ON

OFF

ON

S/N

Non-Fusible

Three-Pole with Neutral

Two Sources or

Two Loads

ON

OFF

ON

Non-Fusible

Six-Pole

Two Sources or

Two Loads

Double-throw safety switches

applied in emergency power

or generator applications may

require a switched neutral in lieu

of a solid neutral. If the neutral

of the generator is bonded

to a grounding system at the

generator, then a separately

derived system (reference NEC

250-20[D] and Exhibit 250.7) has

been created and a switched

neutral in the double-throw safety

switch is required. The switching

neutral is required to avoid the

potential for backfeeding of the

power that might occur if the

safety switch neutral is also

bonded. If the generator neutral

is brought to the service where

it is bonded and grounded, then

a non-separately derived system

has been created and a solid

neutral must be used in the

double-throw safety switch.

Most double-throw safety

switches in today’s market are

provided with solid neutrals and

are not UL listed for switching

neutral application. The market,

some utilities and local codes

are requiring the ability to break

or switch the neutral on three-

and four-pole double-throw

switches with a UL listing for that

capability. Three-pole switches

are used for single-phase

switching neutral applications,

while four-pole switches are used

for three-phase switching neutral

applications. In many cases, three-

and four-pole double-throw safety

switches are being installed in

the field with the left-most pole

being used as the switching

neutral, but the switch is not

UL listed for that application.

Eaton non-fusible three-pole and

four-pole double-throw safety

switches 30–800A are UL listed

for switching neutral application

with the proper installation of

the applicable switching neutral

bonding kit shown in the

Accessories section of this bro-

chure. Each bonding kit comes

with applicable materials, hard-

ware, instruction sheet and

adhesive-backed wiring schematic.

The bonding kits can only be

used on non-fusible double-throw

safety switches. When a bond-

ing kit is applied to a three-pole

switch, the switch becomes a

single-phase switch with single-

phase horsepower ratings.

A double-throw safety switch

with the appropriate bonding kit

installed is suitable for service

entrance use. Typically, a four-pole

double-throw safety switch is not

suitable for service entrance use;

however, with the appropriate

bonding kit installed, the four-

pole switch is suitable for service

entrance use as noted on the

device publication of the product.

Switching neutral bonding kits

can also be factory installed

by Eaton’s unique Switching

Device Flex Center. See the end

of this brochure for additional

information on the Flex Center.

6

EATON CORPORATION Double-throw safety switch

7

EATON CORPORATION Double-throw safety switch