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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 Kohlerr 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.
Standard Features
D
Allows utility voltage display on the RDC2/DC2 integrated generator set/transfer switch controller, available exclusively on Kohlerr 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 certification, file #LR58301, is available for: d
Standard ATS without load center (single and three-phase) d
Service entrance ATS 100, 150, and 200 amp 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
Service entrance models include disconnect circuit breaker on the utility (normal) source side (80% rated)
D
Five-year limited warranty
Available Models
D
100, 200, and 400 amp standard and service entrance models are available.
D
150 and 300 amp service entrance models are also available.
D
100 amp standard single-phase models are available with or without a 16-space load center. Up to 8 tandem breakers can be used for a total of 24 circuits.
D
100 Amp standard single phase model with a 12-space load center and a NEMA 1 enclosure is available as a standalone non-configurable spec (GM85273-SA_).
D
See page 6 for more information.
G11-121 (Model RXT Automatic Transfer Switch) 9/14g Page 1
Optional Accessories
The following optional accessories are available:
Status indicator kit
D
LED indicators for source availability and contactor position
D
Mounts on the outside of the RXT enclosure
D
Dimensions: 92 mm x 42 mm (3.62 in. x 1.65 in.)
D
View transfer switch status without removing enclosure cover
D
An overhang on the enclosure protects the indicator panel and ribbon cable opening
D For more information on the status indicator kit, see specification sheet G11-123
-
Load shed kit
D
Automatically sheds non-critical loads when essential appliances are running
D
Prevents generator overload in compliance with
NEC 2008
D
Provides two (2) HVAC relays, rated 10 A @ 125 VAC, to control two independent air conditioner loads
D
Includes four (4) pilot relays rated 120VAC, 125VA (pilot duty), 10 A @ 125 VAC (general purpose) to control customer-provided power relays for non-essential loads
D
Mounts inside the ATS enclosure
D
Uses Kohler’s exclusive RBUS communication protocol
D
Requires Kohlerr residential generator set with RDC2 or
DC2 controller
D
For more information on the load shed kit, see specification sheet G11-124
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
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
CSA certification available, file #LR58301 (not available for
300--400 amp service entrance or 100 amp load center models). Must be selected when the transfer switch is ordered.
D
NFPA 70, National Electrical Code
D
NFPA 110, Emergency and Standby Power Systems
D
NEMA Standard IC10--1993, AC Automatic Transfer
Switches
Specifications
Interface Module Specifications
Load Control Contact Rating
Load Control Wire Size
10 A @ 250 VAC
#12--18 AWG
Controller Interface Connections
A and B Wire Size
Controller Interface Connections
PWR and COM Wire Size
#20 AWG shielded twisted-pair
Belden 9402 or 8723 or equivalent
#12--20 AWG
Environmental Specifications
Operating temperature
−20_C to 70_C (−4_F to 158_F)
Storage temperature
Humidity
−40_C to 85_C (−40_F to 185_F)
5 to 95% noncondensing
Cable Sizes
AL/CU UL-Listed Solderless Screw-Type Terminals for External Power Connections
Range of Wire Sizes, Cu/Al Switch
Size,
Amps Switch
Standard
Phases
1
Normal and Emergency
(1) #14 -- 1/0 AWG
Load
(1) #14 – 1/0 AWG
Neutral
(3) #12 to 250 KCMIL (Cu) or
(3) #10 to 250 KCMIL (Al)
Ground
100
150
200
200
With load center
Service
Entrance
3-Phase
Service
Entrance
Standard
3-Phase
1
1
3
1
1
3
(1) #14 – 1/0 AWG
Normal: (1) #12 – 2/0 AWG
Emerg: (1) #6 – 250 MCM
(1) #8 – 3/0 AWG
Normal: (1) #4 – 300 MCM
Emerg: (1) #6 -- 250 MCM
(1) #6 AWG – 250 MCM
(1) #6 AWG – 250 MCM per customer-supplied circuit breaker
(1) #6 – 250 MCM
(1) #8 – 3/0 AWG
(1) #6 AWG – 250 MCM
(1) #6 AWG – 250 MCM
(1) #6 AWG – 250 MCM
(1) #6 – 2/0 AWG
(3) #12 to 250 KCMIL (Cu) or
(3) #10 to 250 KCMIL (Al)
(3) #6 AWG – 3/0 AWG
(3) #12 to 250 KCMIL (Cu) or
(3) #10 to 250 KCMIL (Al)
(3) #12 to 250 KCMIL (Cu) or
(3) #10 to 250 KCMIL (Al)
(3) #4 AWG – 600 MCM
(6) 1/0 – 250 MCM
(9) #4 – 14 AWG
(3) #14 – 1/0 AWG
(3) #6 – 3/0 AWG
(3) #14 – 1/0 AWG
(9) #4 – 14 AWG
(3) #6 – 3/0 AWG
300
400
Service
Entrance
1
Normal: : (1) #1 -- 600 MCM or (2) #1 – 250 MCM
Emerg: (2) #6 -- 250 MCM
(2) #6 – 250 MCM
(3) #4 – 600 MCM
(6) 1/0 – 250 MCM
(3) #6 – 3/0 AWG
400
Standard
3-pole
208-240 V
3 or 4 pole
480 V
1
3
(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
3
(1) #4 – 600 MCM
(2) #6 – 250 MCM
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) 9/14g 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, 150, 200
WCR, RMS Symmetrical Amps at 240 VAC
22,000
300, 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
150
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) 9/14g Page 3
Switch
Rating,
Amps
100
200
300
400
300
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
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
SGHA, FGN, FGL, FGP
CJ600N, CJ600H
600
600
ABB T5, T6 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
Square D
ITE/Siemens
Merlin Gerin
DK, KDB, KD, CKD, HKD, CHKD, KDC, LCL,
LA TRIPAC
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
400
Maximum
Size, Amps
150
250
400
100
250
400
125
250
G11-121 (Model RXT Automatic Transfer Switch) 9/14g 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
GE
Merlin Gerin
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
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
800
250
400
600
800
250
400
600
800
Maximum
Size, Amps
250
400
300--600
300--800
250
600
800
250
400
600
H
W D*
Amps
100
150--200
200
Description
Single phase
With 12- or 16-space load center (NEMA 1)
With 16-space load center
Three phase
Service entrance (ASE)
Service entrance (CSE)
Service entrance (ASE)
Service entrance (CSE)
Single phase
Three phase
Service entrance
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
(24.0 x 13.0 x 6.0)
(24.2 x 13.2 x 7.1)
(26.7 x 18.2 x 9.0)
731 x 416 x 175
735 x 416 x 175
731 x 416 x 175
735 x 416 x 175
620 x 335 x 180
679 x 462 x 228
1067 x 559 x 329
(28.8 x 16.4 x 6.9)
(28.9 x 16.4 x 6.9)
(28.8 x 16.4 x 6.9)
(28.9 x 16.4 x 6.9)
(24.4 x 13.2 x 7.1)
(26.7 x 18.2 x 9.0)
(42.0 x 22.0 x 12.9) 300
400
Single phase
3-Pole/208--240 volts
3-Pole/480 volts
4-Pole
1067 x 559 x 329
1067 x 559 x 329
1222 x 610 x 343
1222 x 610 x 343
Service entrance 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.
(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)
Note: Enclosures are type NEMA 3R except as noted.
G11-121 (Model RXT Automatic Transfer Switch) 9/14g Page 5
Shipping Weight ] kg (lb.)
7 (15)
12
9
15
(26)
(20)
(34)
12
14
14
16
8
16
59
50
54
68
73
59
(26)
(30)
(30)
(34)
(17)
(35)
(130)
(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 Controls
Model Designation
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
Enclosure
A:
C:
NEMA 1 *
NEMA 3R
Controls
J: Interface for RDC2/DC2 Controller * NEMA 1 enclosure is available on 100 amp load center models only.
Voltage/Frequency
C:
F:
208 Volts/60 Hz (3-phase only)
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
Current Rating
0100: 100 amps
0150: 150 amps
0200: 200 amps
0300: 300 amps
0400: 400 amps
Connections
A:
B:
No load center
With load center (100 amp single-phase only)
ASE: Service entrance rated
CSE: Service entrance rated with CSA certification (100/150/200 amps only)
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
100
150
200
300
400
Description
(Connections)
Standard (A)
Standard, with load center (B) W
Standard, with load center **
Service entrance (ASE, CSE)
Standard, 3-phase
Service entrance (ASE, CSE)
Standard (A)
Service entrance (ASE, CSE)
Standard, 3-phase (A)
Service entrance (ASE)
Standard (A)
Service entrance (ASE)
Standard, 3-phase (A)
208 (C)
D
D
D
Voltages
240 (F)
D
D
D
D
D
D
D
D
D
D
D
D
D w
Withstand and close-on rating. See pages 3-5 for WCR information and specific breaker ratings.
W
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.
** GM85273--SA_ with 12-space load center and NEMA 1 enclosure.
480 (M)
D
D
D
Poles
2 (N)
2 (N)
2 (N)
2 (N)
3 (T) or 4 (V)
2 (N)
2 (N)
2 (N)
3 (T) or 4 (V)
2 (N)
2 (N)
2 (N)
3 (T) or 4 (V)
DISTRIBUTED BY:
Phases
1
1
1
1
1
1
3
1
1
1
3
1
3
WCR w
RMS Symmetrical Amps
10,000
10,000
10,000
22,000
30,000
22,000
10,000
22,000
30,000
35,000
50,000
35,000
50,000
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 Kohlerr generator distributor for availability.
2011, 2012, 2013, 2014 by Kohler Co. All rights reserved.
G11-121 (Model RXT Automatic Transfer Switch) 9/14g Page 6
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