Double-throw

safety switches

Eaton’s double-throw safety switches are used to transfer service from a normal power

source to an alternate source, or to switch from one load circuit to another. The manually

operated double-throw safety switch provides an economical means of transferring power.

Eaton offers a full line of general-duty and heavy-duty double-throw safety switches.

General-duty

Eaton’s general-duty double-

throw safety switches are

commonly applied in emergency

power or generator applications

to reduce or eliminate the costly

impact of power loss from the

typical source in residential,

agricultural and light commer-

cial markets. All general-duty

double-throw safety switches

are non-fusible and are available

up to 400A.

A standby generator connected

to a residential wiring system

must be installed according to

the National Electrical Code.�

A double-throw switch must be

installed to isolate and discon-

nect wiring from normal utility

lines so that generator-produced

electricity is not back-fed

onto normal utility lines.

Whether normal electrical

service is disrupted by severe

weather conditions, accidents or

other issues, an Eaton general-

duty double-throw safety switch

is a critical component in your

standby generator applications.

Heavy-duty

Eaton’s heavy-duty double-

throw safety switches are

designed for commercial and

industrial applications. Fusible

switches are available through

600A, while non-fusible switches

are manufactured up to 800A.

The wiring configuration from

the factory allows a single load

to be supplied by a normal

or alternate source; however,

where necessary, the wiring can

be field modified to allow two

loads to be alternately supplied

by a single power source.

Heavy-duty double-throw

safety switches are designed

to accommodate a wide range

of accessories that can be factory

or field installed. Customized

solutions, including key inter-

locks, viewing windows and

receptacles, are also available

through Eaton’s Switching

Device Flex Center.

Double-throw general-duty

non-fusible safety switches

DT224URK-NPS

Quick-Make, Quick-Break Design,

200A, 240V.

Double-throw, 240 Vac

general-duty, non-fusible

compact design

Specifications

•

30–100A

•

Suitable for service entrance

use with neutral kit installed

•

Suitable for use as a manu-

ally operated switch per 2005

NEC� Article 702

•

UL� listed File No. E5239

Features

•

Palm-fitting, visible

red handle

•

Tri-lingual nameplate

•

NEMA� 3R enclosure with

side opening door

•

Visible, embossed

ON-OFF indication

•

Concentric knockouts on

bottom endwall and sides

•

Lockable door hasp

•

Lockable handle

•

Three-point mounting

•

Factory-installed neutral

(optional catalog numbers are

available without a neutral)

•

Terminals suitable for 60º

or 75ºC Al or Cu wire

•

Rounded shroud

•

Mechanical door interlock to

prevent easy access when the

switch is in the ON position

•

Suitable for use on a circuit

capable of delivering

not more than 10,000 rms

symmetrical amperes

•

Compact size

Double-throw, 240 Vac

general-duty, non-fusible,

quick-make, quick-break

design

Specifications

•

30–400A

•

Horsepower rated

•

Suitable for service entrance

use with neutral kit installed

•

Suitable for use as a manually

operated switch per 2005

NEC Article 702

•

UL listed File No. E5239

•

Quick-make, quick-break

operating mechanism

Features

•

Palm-fitting, visible

red handle

•

Tri-lingual nameplate

•

NEMA 3R enclosure with

side opening door

•

Visible, embossed red

ON-OFF indication

•

Tangential knockouts

(30–100A) on bottom end-

wall; concentric knockouts on

higher ratings, and sides and

rear of 30–100A

•

Lockable door hasp

•

Lockable handle

•

Factory-installed neutral

(optional catalog numbers are

available without a neutral)

•

Three-point mounting

(30–100A)

•

Four-point mounting

(200–400A)

•

Terminals suitable for 60º

or 75ºC Al or Cu wire on

30–100A; 75ºC Al or Cu wire

on higher ratings

•

Rounded shroud

•

Door cannot be opened with

the switch ON. Switch cannot

be turned ON with door open

(without operating interlock

defeater)

•

Suitable for use on a circuit

capable of delivering not

more than 100,000 rms

symmetrical amperes when

protected by Class R or J fuses

(30–200A); R, T or J fuses

(400A). Short-circuit rating

is 10,000 rms symmetrical

amperes when protected

by any other overcurrent

protective device

•

Double-break visible rotary

blades; quick-make, quick-

break operation

Double-Throw Compact Design

Ampere

Rating

Main and

Standby

NEMA 3R

Enclosure

Rainproof

Catalog Number

Non-Fusible Two-Pole—240 Vac

30

60

100

DT221URH

DT222URH

DT223URH

Non-Fusible Two-Pole, Three-Wire—240 Vac—Solid Neutral

30

60

100

DT221URH-N

DT222URH-N

DT223URH-N

Double-Throw Quick-Make, Quick-Break Design

Ampere

Rating

Main and

Standby

Maximum

Horsepower Ratings NEMA 3R

Enclosure

Rainproof

Single-Phase

240 Vac

250 Vdc

Catalog Number

Non-Fusible Two-Pole—240 Vac—250 Vdc

30

60

100

200

400

3

10

20

15

—

5

10

20

40

50

DT221URKPS

DT222URKPS

DT223URKPS

DT224URKPS

DT225URKPS

Non-Fusible Two-Pole, Three-Wire—240 Vac—250 Vdc—Solid Neutral

30

60

100

200

400

3

10

20

15

—

5

10

20

40

50

DT221URK-NPS

DT222URK-NPS

DT223URK-NPS

DT224URK-NPS

DT225URK-NPS

ON

OFF

ON

ON

OFF

ON

S/N

Non-Fusible

Two-Pole

Two Sources or

Two Loads

ON

OFF

ON

ON

OFF

ON

S/N

Non-Fusible

Two-Pole with

Neutral

Two Sources or

Two Loads

DT223URH-N

Compact Design, 100A, 240V

ON

OFF

ON

ON

OFF

ON

S/N

Non-Fusible

Two-Pole

Two Sources or

Two Loads

ON

OFF

ON

ON

OFF

ON

S/N

Non-Fusible

Two-Pole with

Neutral

Two Sources or

Two Loads

2

EATON CORPORATION Double-throw safety switch

3

EATON CORPORATION Double-throw safety switch