Covers have been removed for illustration.

Model:

RXT

Automatic Transfer Switch

100--400 Amps

Model RXT Automatic Transfer Switch

The Model RXT automatic transfer switch is designed for use only with Kohler r generator sets equipped with RDC2 or DC2 generator set/transfer switch controls. The transfer switch operation is controlled by the RDC2/DC2 integrated generator set/transfer switch controller, which is mounted on the following

Kohler r generator set models: d 14RESA/RESAL d 20RESA/RESAL d 38RCL d 48RCL

Standard Features

D Allows utility voltage display on the RDC2/DC2 integrated generator set/transfer switch controller, available exclusively on Kohler r residential and light commercial generator sets

D Interface board for connection to the Model RDC2 or DC2 generator set/transfer switch controller (mounted on generator set models listed above)

D UL listed d Models with load centers, UL 67 listed, file #E251086 d Models without load centers, UL 1008 listed, file #E58962

D CSA certified, file #LR58301 (not applicable to service entrance or load center models)

D Corrosion-resistant NEMA 3R aluminum enclosure: d Padlockable d Approved for indoor or outdoor installation d ANSI 49 gray

D NEMA 1 enclosure available on 100 amp load center models

D Contactor electrically and mechanically interlocked

D Double throw inherently interlocked design

D Contactor manually operable for maintenance purposes

D Silver alloy main contacts

D Transfer switches are 100% equipment rated and can be applied at the rated current without derating (non-service entrance models)

D 100, 200, and 400 amp standard and service entrance models are available; see page 6 for available models

D 100 amp standard single-phase models are available with or without 16-space load center. Up to 8 tandem breakers can be used for a total of 24 circuits.

D Service entrance models include disconnect circuit breaker on the utility (normal) source side (80% rated)

D Five-year limited warranty

D Optional status indicator available: d LED indicators for source availability and contactor position d View transfer switch status without removing enclosure cover

G11-121 (Model RXT Automatic Transfer Switch) 10/12b Page 1

Codes and Standards

The ATS meets or exceeds the requirements of the following specifications:

D Underwriters Laboratories UL 67, Enclosed Panel Boards

(load center models) file # E251086

D CSA certified, file #LR58301 (not applicable to service entrance or load center models)

D Underwriters Laboratories UL 1008, Standard for Automatic

Transfer Switches for Use in Emergency Systems, file # E58962

D Underwriters Laboratories UL 508, Standard for Industrial

Control Equipment

D NFPA 70, National Electrical Code

D NFPA 110, Emergency and Standby Power Systems

D NEMA Standard IC10--1993, AC Automatic Transfer

Switches

Specifications

Environmental Specifications

Operating temperature

Storage temperature

−20_C to 70_C (−4_F to 158_F)

−40_C to 85_C (−40_F to 185_F)

Humidity 5 to 95% noncondensing

Interface Module Specifications

Load Control Contact Rating 10 A @ 250 VAC

Load Control Wire Size

Controller Interface Connections

A and B Wire Size

Controller Interface Connections

PWR and COM Wire Size

#12--18 AWG

#20 AWG shielded twisted-pair

Belden 9402 or 8723 or equivalent

#12--20 AWG

Cable Sizes

AL/CU UL-Listed Solderless Screw-Type Terminals for External Power Connections

Switch

Size,

Amps

100

200

Switch

Standard

With load center

Service

Entrance

3-Phase

Standard

Service

Entrance

Phases

1

1

1

3

1

1

Normal and Emergency

(1) #14 -- 1/0 AWG

(1) #14 – 1/0 AWG

Normal: (1) #12 – 2/0 AWG

Emerg: (1) #6 – 250 MCM

(1) #8 – 3/0 AWG

(1) #6 AWG – 250 MCM

Normal: (1) #4 – 300 MCM

Emerg: (1) #6 -- 250 MCM

Range of Wire Sizes, Cu/Al

Load

(1) #14 – 1/0 AWG per customer-supplied circuit breaker

(1) #6 – 250 MCM

(1) #8 – 3/0 AWG

(1) #6 AWG – 250 MCM

(1) #6 AWG – 250 MCM

Neutral

(3) #12 – 1/0 AWG

(1) #6 – 2/0 AWG

(3) #6 – 250 MCM

(3) #6 AWG – 3/0 AWG

(3) #6 AWG – 250 MCM

(3) #6 AWG – 250 MCM

Ground

(9) #4 – 14 AWG

(9) #4 – 14 AWG

(3) #14 – 1/0 AWG

(3) #6 – 3/0 AWG

(9) #4 – 14 AWG

(3) #14 – 1/0 AWG

3-Phase 3 (1) #6 AWG – 250 MCM (1) #6 AWG – 250 MCM

(3) #4 AWG – 600 MCM

(6) 1/0 – 250 MCM

(3) #6 – 3/0 AWG

400

Standard

Service

Entrance

3-pole

208-240 V

3 or 4 pole

480 V

1

1

3

3

(2) #6 – 250 MCM

Normal: (2) 3/0 – 250 MCM

Emerg: (2) #6 -- 250 MCM

(2) #6 – 250 MCM

(1) #4 – 600 MCM

(2) #6 – 250 MCM

(2) #6 – 250 MCM

(2) #6 – 250 MCM

(2) #6 – 250 MCM

(1) #4 – 600 MCM

(2) #6 – 250 MCM

(3) #4 – 600 MCM

(6) 1/0 – 250 MCM

(3) #6 – 3/0 AWG

Note: Data is subject to change. Refer to the transfer switch dimension drawings and wiring diagrams for planning and installation.

G11-121 (Model RXT Automatic Transfer Switch) 10/12b Page 2

Withstand and Close-On Ratings (WCR)

Service Entrance Transfer Switch Ratings

The service entrance transfer switch is factory-equipped with a normal source disconnect circuit breaker.

Suitable for control of motors, electric discharge lamps, tungsten filament lamps and electric heating equipment where the sum of motor full-load ampere ratings and the ampere ratings of other loads do not exceed the ampere rating of the switch and the tungsten load does not exceed 30 percent of switch rating.

Switch Rating, Amps

100 *

200 *

WCR, RMS Symmetrical Amps at 240 VAC

22,000

400 * 35,000

* Continuous load current not to exceed 80% of switch rating.

Contactor Ratings with Coordinated Circuit Breakers

Single-phase transfer switches are UL listed at 240 VAC maximum. Three-phase transfer switches are rated at 480 VAC maximum. The following table lists contactor withstand current ratings (WCR) for 100--400 ampere non-service entrance rated switches with specific manufacturer’s circuit breakers per UL and Canadian safety standards. Suitable for control of motors, electric discharge lamps, tungsten filament lamps and electric heating equipment where the sum of motor full-load ampere ratings and the ampere ratings of other loads do not exceed the ampere rating of the switch and the tungsten load does not exceed 30 percent of switch rating.

The transfer switch is rated for use on a circuit capable of delivering not more than the RMS symmetrical amperes maximum as shown in the tables below, but no greater than the interrupting capacity of the selected breaker.

Switch

Rating,

Amps

100

200

Voltage, max.

240

240

WCR Ratings with Specific Manufacturer’s Molded-Case Circuit Breakers

Number of Poles/

Phases

WCR, RMS

Symmetrical

Amps Manufacturer

2 pole/

1 phase

2 pole/

1 phase

10,000

10,000

Eaton/

Cutler-Hammer

Square D

Siemens

GE

Eaton/

Cutler-Hammer

Square D

Siemens

GE

Type or Class

FCL, FB, QCHW, GB, GHB, GC, GHC, GD, EHD

FDB, FD, HFD, FDC, CA, CAH

FI, FC, FA, FH

QOM1, QOM1--VH

Q2, Q2--H. Q2H

QOM2, QOM2--VH

QB, QD, QG, GJ

CED6, ED2, ED4, ED6, HED4, HED6, QP(Q2125),

QPH(Q2125H)

QJ2, QJH2

THQB, THQC, THHQB, THHQC

THHQL, TQDL, THQDL

SE, TQD, THQD, THED

CSR/BHW, FD, HFD

JD, JDB, HJD

JDC

DK, KD, KDB, HKD, KDC, LCL, LA

Q2. QOM2, QOM2--VH, Q2--H, Q2H

KI, KA, KH, KC, QB, QD, QG, QJ

LE, LX, LXI, LC, LI, LA, LH

FD6-A, FXD6-A, HFD6, CFD6

TQDL, THQDL

THLC2

SF

Maximum

Size, Amps

100

150

100

125

175

225

250

125

150

100

125

150

225

225--250

250

400

225

250

400

250

125

225

250

G11-121 (Model RXT Automatic Transfer Switch) 10/12b Page 3

Switch

Rating,

Amps

100

200

400

400

Voltage, max.

480

240

240

WCR Ratings with Specific Manufacturer’s Molded-Case Circuit Breakers

Number of Poles/

Phases

WCR, RMS

Symmetrical

Amps Manufacturer Type or Class

FDC, HFD

3 pole/

3 phase

4 pole/

3 phase

30,000

Cutler-Hammer

Square D

ITE/Siemens

HJD, JDC

HKD, KD, KDB, KDC, LA TRI--PAC, LCL

FC, FI

KC, KH, KI

LA, LC, LE, LH, LI, LX, LXI

CED6, HED4, HED6

CFD6, FD6, FXD6, HFD6

CJD6, HJD6, HHJD6, HHJXD6, JD6, JXD6,

SCJD6, SHJD6, SJD6

1 phase

3 pole/

3 phase

1 phase

3 pole/

3 phase

50,000

50,000

Maximum

Size, Amps

150

250

400

100

250

400

125

250

400

GE

TB1

SEL, SEP, TEL, THLC1

TFL, THLC2

SFL, SFP

100

150

225

250

SGL4, SGP4, TB4, THJK4, THLC4, TJJ, TJK4,

TLB4

400

Cutler-Hammer

Square D

ITE/Siemens

LD, LDB, HLD, LDC, CLD, CHLD, CLDC

MDL, HMDL, NB

LC, LI, LE, LX, LXI, DG, DJ, DL

LD, LXD, HLD, HLXD, HHLD, HHLXD, CLD,

NLGA, HLGA, LLGA, SLD, SHLD, SCLD

LMD, LMXD, HLMD, HLMXD, MD, MXD, HMD,

HMXD, CMD, NMG, HMG, LMG, SMD, SHMD,

SCMD

600

800

600

600

800

GE

Merlin Gerin

ABB

SGHA, FGN, FGL, FGP

CJ600N, CJ600H

T5, T6

600

600

600

If any of the following breakers is selected for application, the continuous load current must not exceed 80 percent of the switch rating:

Cutler-Hammer

DK, KDB, KD, CKD, HKD, CHKD, KDC, LCL,

LA TRIPAC

400

Square D

ITE/Siemens

Merlin Gerin

LA, LH, LC, LI, LE, LX, LXI

NJGA, HJGA, LJGA, JXD2, JD6, JXD6, HJD6,

HJXD6, HHJD6, HHJXD6, CJD6, SJD6, SHJD6,

SCJD6

CJ400N, CJ400H, CJ400L

400

400

400

G11-121 (Model RXT Automatic Transfer Switch) 10/12b Page 4

Switch

Rating,

Amps

400

Voltage, max.

480

WCR Ratings with Specific Manufacturer’s Molded-Case Circuit Breakers

Number of Poles/

Phases

WCR, RMS

Symmetrical

Amps Manufacturer

3 pole/

3 phase

4 pole/

3 phase

50,000

Cutler-Hammer

Square D

ITE/Siemens

Type or Class

HJD, JDC

HKD, CHKD, KDC, LCL, LA TRIPAC

HLD, CHLD, LDC, CLDC

NB TRI--PAC

KI, KC

LI, LXI, LX, LE, LC

MX, ME, MH

CFD6, HFD6

CJD6, SCJD6, HHJD6, HHJXD6, SHJD6, HJD6

CLD6, SCLD6, HHLD6, HHLXD6, SHLD6, HLD6

CMD6, SCMD6, HMD6, SHMD6, HMXD6, MD6,

MXD6, SMD6

GE

Merlin Gerin

SFL, SFP, TFL, THLC2

SGL4, SGP4, TB4, THLC4, TLB4

SGL6, SGP6, TB6, TJL4V, TKL4V, TJL1S--6S

SKL8, SKP8, TB8, SKH8

CF250L, CF250H

CJ400L, CK400H, CJ400H, CK400N

CJ600H

CK800H, CK800N

Dimensions and Weights

Maximum

Size, Amps

250

400

300--600

300--800

250

600

800

250

400

600

800

250

400

600

800

250

400

600

800

H

W D*

Amps

100

200

Description

Single phase

With load center (NEMA 1)

With load center (NEMA 3R)

Three phase

Service Entrance

Single phase

Three phase

Dimensions, H x W x D, mm (in.) *

620 x 335 x 180 (24.4 x 13.2 x 7.1)

610 x 330 x 154

614 x 335 x 180

679 x 462 x 228

731 x 416 x 175

620 x 335 x 180

679 x 462 x 228

400

Service Entrance

Single phase

3-Pole/208--240 Volts

3-Pole/480 Volts

731 x 416 x 175

1067 x 559 x 329

1067 x 559 x 329

1222 x 610 x 343

4-Pole

Service Entrance

1222 x 610 x 343

1067 x 559 x 329

* Depth does not include the padlock hasp on the front of the enclosure.

[ Shipping weights are approximate and include packaging.

(24.0 x 13.0 x 6.0)

(24.2 x 13.2 x 7.1)

(26.7 x 18.2 x 9.0)

(28.8 x 16.4 x 6.9)

(24.4 x 13.2 x 7.1)

(26.7 x 18.2 x 9.0)

(28.8 x 16.4 x 6.9)

(42.0 x 22.0 x 12.9)

(42.0 x 22.0 x 12.9)

(48.1 x 24.0 x 13.5)

(48.1 x 24.0 x 13.5)

(42.0 x 22.0 x 12.9)

G11-121 (Model RXT Automatic Transfer Switch) 10/12b Page 5

14

50

54

68

73

59

Shipping Weight [ kg (lb.)

7 (15)

12

9

15

12

8

16

(26)

(20)

(34)

(26)

(17)

(35)

(30)

(110)

(120)

(150)

(160)

(130)

KOHLER CO., Kohler, Wisconsin 53044 USA

Phone 920-457-4441, Fax 920-459-1646

For the nearest sales and service outlet in the

US and Canada, phone 1-800-544-2444

KohlerPower.com

Model

Model Designation

Controls Voltage Poles Enclosure

Kohler Power Systems

Asia Pacific Headquarters

7 Jurong Pier Road

Singapore 619159

Phone (65) 6264-6422, Fax (65) 6264-6455

Current Rating Connections

Record the transfer switch model designation in the boxes. The transfer switch model designation defines ratings and characteristics as explained below.

Sample Model Designation:

RXT-JFNC-0200A

Model

RXT: Kohler Automatic Transfer Switch

Controls

J: Interface for RDC2/DC2 Controller

Voltage/Frequency

C: 208 Volts/60 Hz (3-phase only)

F: 240 Volts/60 Hz

M: 480 Volts/60 Hz (3-phase only)

Number of Poles/Wires

N:

T:

V:

2-pole, 3-wire, solid neutral (120/240 V only)

3-pole, 4-wire, solid neutral

4-pole, 4-wire, switched neutral

Enclosure

A:

C:

NEMA 1 *

NEMA 3R

* NEMA 1 enclosure is available on 100 amp load center models only.

Current Rating

0100: 100 amps

0200: 200 amps

0400: 400 amps

Connections

A:

B:

No load center

With load center (100 amp single-phase only)

ASE: Service entrance rated

Available Models

All Model RXT transfer switches are standard-transition 60 Hz automatic transfer switches. Letters in parentheses refer to the model designation code described above.

Amps

Description

(Connections) 208 (C)

Voltages

240 (F) 480 (M) Poles Phases

WCR *

RMS Symmetrical Amps

100

200

400

Standard (A)

Standard, with load center (B)

Service entrance (ASE)

Standard, 3-phase

Standard (A)

Service entrance (ASE)

Standard, 3-phase (A)

Standard (A)

Service entrance (ASE)

Standard, 3-phase (A)

[

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

2 (N)

2 (N)

2 (N)

3 (T) or 4 (V)

2 (N)

2 (N)

3 (T) or 4 (V)

2 (N)

2 (N)

3 (T) or 4 (V)

1

1

1

3

1

1

3

1

1

3

10,000

10,000

22,000

30,000

10,000

22,000

30,000

50,000

35,000

50,000

* Withstand and close-on rating. See pages 3-5 for WCR information and specific breaker ratings.

[ With 16-space load center and NEMA 1 or NEMA 3R enclosure. Up to 8 tandem breakers can be used, for a maximum of 24 circuits.

DISTRIBUTED BY:

Availability is subject to change without notice. Kohler Co. reserves the right to change the design or specifications without notice and without any obligation or liability whatsoever. Contact your local Kohler r generator distributor for availability.

© 2011, 2012 by Kohler Co. All rights reserved.

G11-121 (Model RXT Automatic Transfer Switch) 10/12b Page 6