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Kohler RXT Automatic Transfer Switch

Model: RXT, 100-400 Amps

Manufacturer: Kohler Co.

Contact: Kohler Power Systems, Kohler, Wisconsin 53044 USA

Website: KOHLERPower.com

Product Overview

The Model RXT automatic transfer switch is designed for use exclusively with Kohler generator sets equipped with RDC2 or DC2 generator set/transfer switch controls. The transfer switch operation is managed by the RDC2/DC2 integrated controller, which is typically mounted on Kohler generator set models such as 14RESA/RESAL, 20RESA/RESAL, 38RCL, and 48RCL.

Image Description: The product image shows the transfer switch with its covers removed to illustrate internal components.

Standard Features

  • Provides utility voltage display on the RDC2/DC2 integrated generator set/transfer switch controller, a feature exclusive to Kohler residential and light commercial generator sets.
  • Includes an interface board for connection to the Model RDC2 or DC2 generator set/transfer switch controller.
  • UL listed.
  • Available in models with load centers (UL 67 listed, file #E251086) and models without load centers (UL 1008 listed, file #E58962).
  • CSA certification is available (file #LR58301), though not applicable to service entrance or load center models.
  • Features a corrosion-resistant NEMA 3R aluminum enclosure that is padlockable and approved for indoor or outdoor installation, finished in ANSI 49 gray.
  • A NEMA 1 enclosure is available for 100 amp load center models.
  • The contactor is electrically and mechanically interlocked and features a double-throw inherently interlocked design.
  • The contactor can be manually operated for maintenance purposes.
  • Equipped with silver alloy main contacts.
  • Transfer switches are 100% equipment rated, allowing application at rated current without derating (for non-service entrance models).
  • Available in 100, 200, and 400 amp standard and service entrance models.
  • 100 amp standard single-phase models can be configured with or without a 16-space load center, supporting up to 8 tandem breakers for a total of 24 circuits.
  • Service entrance models incorporate a disconnect circuit breaker on the utility (normal) source side (rated at 80%).
  • Comes with a five-year limited warranty.
  • An optional status indicator is available, featuring LED indicators for source availability and contactor position, allowing users to view transfer switch status without removing the enclosure cover.

Codes and Standards

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

  • Underwriters Laboratories UL 67, Enclosed Panel Boards (load center models) file #E251086
  • Underwriters Laboratories UL 1008, Standard for Automatic Transfer Switches for Use in Emergency Systems, file #E58962
  • Underwriters Laboratories UL 508, Standard for Industrial Control Equipment
  • CSA certification available, file #LR58301 (must be selected when ordering; not applicable to service entrance or load center models).
  • NFPA 70, National Electrical Code
  • NFPA 110, Emergency and Standby Power Systems
  • NEMA Standard IC10-1993, AC Automatic Transfer Switches

Specifications

Environmental Specifications

Specification Value
Operating temperature -20°C to 70°C (-4°F to 158°F)
Storage temperature -40°C to 85°C (-40°F to 185°F)
Humidity 5 to 95% noncondensing

Interface Module Specifications

Specification Value
Load Control Contact Rating 10 A @ 250 VAC
Load Control Wire Size #12-18 AWG
Controller Interface Connections (A and B Wire Size) #20 AWG shielded twisted-pair, Belden 9402 or 8723 or equivalent
Controller Interface Connections (PWR and COM Wire Size) #12-20 AWG

Cable Sizes

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

Switch Size, Amps Switch Phases Range of Wire Sizes, Cu/Al
Normal and Emergency Load Neutral Ground
100 Standard 1 (1) #14 - 1/0 AWG (1) #14 - 1/0 AWG (3) #12 - 1/0 AWG (9) #4 - 14 AWG
With load center 1 (1) #14 - 1/0 AWG (per customer-supplied circuit breaker) (1) #6 – 2/0 AWG (9) #4 - 14 AWG
Service Entrance 1 Normal: (1) #12 – 2/0 AWG
Emerg: (1) #6 – 250 MCM		 (1) #6 - 250 MCM (3) #6 - 250 MCM (3) #14 - 1/0 AWG
3-Phase Standard 3 (1) #8 - 3/0 AWG (1) #8 - 3/0 AWG (3) #6 AWG – 3/0 AWG (3) #6 - 3/0 AWG
200 Standard 1 (1) #6 AWG - 250 MCM (1) #6 AWG - 250 MCM (3) #6 AWG – 250 MCM (9) #4-14 AWG
Service Entrance 1 Normal: (1) #4 – 300 MCM
Emerg: (1) #6 - 250 MCM		 (1) #6 AWG - 250 MCM (3) #6 AWG - 250 MCM (3) #14 - 1/0 AWG
3-Phase Standard 3 (1) #6 AWG - 250 MCM (1) #6 AWG - 250 MCM (3) #4 AWG - 600 MCM (3) #6 - 3/0 AWG
400 Standard 1 (2) #6 - 250 MCM (2) #6 - 250 MCM (3) #4 - 600 MCM (6) 1/0 - 250 MCM
Service Entrance 1 Normal: (2) 3/0 – 250 MCM
Emerg: (2) #6 - 250 MCM		 (2) #6 - 250 MCM (3) #4 - 600 MCM (3) #6 - 3/0 AWG
3-pole/208-240 V 3 (2) #6 - 250 MCM (2) #6 - 250 MCM (6) 1/0 - 250 MCM (3) #6 – 3/0 AWG
3 or 4 pole/480 V 3 (1) #4 – 600 MCM
(2) #6 – 250 MCM		 (1) #4 - 600 MCM
(2) #6 - 250 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.

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. It is 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 does not exceed the switch's ampere rating, and the tungsten load does not exceed 30 percent of the switch rating.

Switch Rating, Amps WCR, RMS Symmetrical Amps at 240 VAC
100* 22,000
200* 35,000
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 tables list 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. These switches are suitable for control of motors, electric discharge lamps, tungsten filament lamps, and electric heating equipment, provided the sum of motor full-load ampere ratings and other load ampere ratings does not exceed the switch's ampere rating, and the tungsten load does not exceed 30 percent of the switch rating. The transfer switch is rated for use on a circuit capable of delivering not more than the RMS symmetrical amperes maximum shown in the tables, but no greater than the interrupting capacity of the selected breaker.

100 Amp Switch Ratings

Voltage, max. Number of Poles/Phases WCR, RMS Symmetrical Amps Manufacturer Type or Class Maximum Size, Amps
240 2 pole/ 1 phase 10,000 Eaton/Cutler-Hammer FCL, FB, QCHW, GB, GHB, GC, GHC, GD, EHD, FDB, FD, HFD, FDC, CA, CAH 150
FI, FC, FA, FH 100
Square D QOM1, QOM1-VH, Q2, Q2-H, Q2H, QOM2, QOM2-VH, QB, QD, QG, GJ 125, 175, 225, 250
Siemens CED6, ED2, ED4, ED6, HED4, HED6, QP(Q2125), QPH(Q2125H), QJ2, QJH2 125, 150
GE THQB, THQC, THHQB, THHQC, THHQL, TQDL, THQDL, SE, TQD, THQD, THED 100, 125, 150
Eaton/Cutler-Hammer CSR/BHW, FD, HFD, JD, JDB, HJD, JDC 225, 225-250, 250
DK, KD, KDB, HKD, KDC, LCL, LA 400
240 2 pole/ 1 phase 10,000 Square D Q2, QOM2, QOM2-VH, Q2-H, Q2H, KI, KA, KH, KC, QB, QD, QG, QJ, LE, LX, LXI, LC, LI, LA, LH 225, 250, 400
Siemens FD6-A, FXD6-A, HFD6, CFD6, TQDL, THQDL, THLC2, SF 250, 125, 225, 250
GE SGL4, SGP4, TB4, THJK4, THLC4, TJJ, TJK4, TLB4 400
Cutler-Hammer LD, LDB, HLD, LDC, CLD, CHLD, CLDC, MDL, HMDL, NB 600, 800
Square D LC, LI, LE, LX, LXI, DG, DJ, DL 600

200 Amp Switch Ratings

Voltage, max. Number of Poles/Phases WCR, RMS Symmetrical Amps Manufacturer Type or Class Maximum Size, Amps
240 2 pole/ 1 phase 10,000 Square D LD, LXD, HLXD, HHLD, HHLXD, CLD, NLGA, HLGA, LLGA, SLD, SHLD, SCLD 600
ITE/Siemens LMD, LMXD, HLMD, HLMXD, MD, MXD, HMD, HMXD, CMD, NMG, HMG, LMG, SMD, SHMD, SCMD 800
GE SGHA, FGN, FGL, FGP 600
Merlin Gerin CJ600N, CJ600H 600

400 Amp Switch Ratings

Voltage, max. Number of Poles/Phases WCR, RMS Symmetrical Amps Manufacturer Type or Class Maximum Size, Amps
480 3 pole/ 3 phase 30,000 Cutler-Hammer FDC, HFD, HJD, JDC, HKD, KD, KDB, KDC, LA TRI-PAC, LCL, FC, FI 150, 250, 400, 100
Square D KC, KH, KI, LA, LC, LE, LH, LI, LX, LXI 250, 400
ITE/Siemens CED6, HED4, HED6, CFD6, FD6, FXD6, HFD6, CJD6, HJD6, HHJD6, HHJXD6, JD6, JXD6, SCJD6, SHJD6, SJD6 125, 250, 400
4 pole/ 3 phase 50,000 GE TB1, SEL, SEP, TEL, THLC1, TFL, THLC2, SFL, SFP, SGL4, SGP4, TB4, THJK4, THLC4, TJJ, TJK4, TLB4 100, 150, 225, 250, 400
Cutler-Hammer LD, LDB, HLD, LDC, CLD, CHLD, CLDC, MDL, HMDL, NB TRI-PAC 600, 800, 300-600, 300-800
Square D LC, LI, LE, LX, LXI, DG, DJ, DL 600
240 1 phase 50,000 ITE/Siemens LD, LXD, HLXD, HHLD, HHLXD, CLD, NLGA, HLGA, LLGA, SLD, SHLD, SCLD 600
ITE/Siemens LMD, LMXD, HLMD, HLMXD, MD, MXD, HMD, HMXD, CMD, NMG, HMG, LMG, SMD, SHMD, SCMD 800
3 pole/ 3 phase 50,000 GE SGHA, FGN, FGL, FGP 600
Merlin Gerin CJ600N, CJ600H 600
ABB T5, T6 600
240 1 phase 50,000 Cutler-Hammer DK, KDB, KD, CKD, HKD, CHKD, KDC, LCL, LA TRIPAC 400
Square D LA, LH, LC, LI, LE, LX, LXI 400
3 pole/ 3 phase 50,000 ITE/Siemens NJGA, HJGA, LJGA, JXD2, JD6, JXD6, HJD6, HJXD6, HHJD6, HHJXD6, CJD6, SJD6, SHJD6, SCJD6 400
Merlin Gerin CJ400N, CJ400H, CJ400L 400
480 3 pole/ 3 phase 50,000 Cutler-Hammer HJD, JDC, HKD, CHKD, KDC, LCL, LA TRIPAC, HLD, CHLD, LDC, CLDC, NB TRI-PAC 250, 400, 300-600, 300-800
Square D KI, KC, LI, LXI, LX, LE, LC, MX, ME, MH 250, 600, 800
4 pole/ 3 phase 50,000 ITE/Siemens CFD6, HFD6, CJD6, SCJD6, HHJD6, HHJXD6, SHJD6, HJD6, CLD6, SCLD6, HHLD6, HHLXD6, SHLD6, HLD6, CMD6, SCMD6, HMD6, SHMD6, HMXD6, MD6, MXD6, SMD6 250, 400, 600, 800
GE SFL, SFP, TFL, THLC2, SGL4, SGP4, TB4, THLC4, TLB4, SGL6, SGP6, TB6, TJL4V, TKL4V, TJL1S-6S, SKL8, SKP8, TB8, SKH8 250, 400, 600, 800
Merlin Gerin CF250L, CF250H, CJ400L, CK400H, CJ400H, CK400N, CJ600H, CK800H, CK800N 250, 400, 600, 800

Note: 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), Square D (LA, LH, LC, LI, LE, LX, LXI), ITE/Siemens (NJGA, HJGA, LJGA, JXD2, JD6, JXD6, HJD6, HJXD6, HHJD6, HHJXD6, CJD6, SJD6, SHJD6, SCJD6), Merlin Gerin (CJ400N, CJ400H, CJ400L).

Dimensions and Weights

Amps Description Dimensions, H x W x D, mm (in.) * Shipping Weight (kg) Shipping Weight (lb.)
100 Single phase 620 x 335 x 180 (24.4 x 13.2 x 7.1) 7 15
With load center (NEMA 1) 610 x 330 x 154 (24.0 x 13.0 x 6.0) 12 26
With load center (NEMA 3R) 614 x 335 x 180 (24.2 x 13.2 x 7.1) 9 20
Three phase 679 x 462 x 228 (26.7 x 18.2 x 9.0) 15 34
200 Service Entrance 731 x 416 x 175 (28.8 x 16.4 x 6.9) 12 26
Single phase 620 x 335 x 180 (24.4 x 13.2 x 7.1) 8 17
Three phase 679 x 462 x 228 (26.7 x 18.2 x 9.0) 16 35
400 Service Entrance 731 x 416 x 175 (28.8 x 16.4 x 6.9) 14 30
Single phase 1067 x 559 x 329 (42.0 x 22.0 x 12.9) 50 110
3-Pole/208-240 Volts 1067 x 559 x 329 (42.0 x 22.0 x 12.9) 54 120
3-Pole/480 Volts 1222 x 610 x 343 (48.1 x 24.0 x 13.5) 68 150
4-Pole 1222 x 610 x 343 (48.1 x 24.0 x 13.5) 73 160
Service Entrance 1067 x 559 x 329 (42.0 x 22.0 x 12.9) 59 130

* Depth does not include the padlock hasp on the front of the enclosure.
† Shipping weights are approximate and include packaging.

Model Designation

The transfer switch model designation defines ratings and characteristics. The structure is as follows:

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 (2-pole, 3-wire, solid neutral, 120/240 V only), T (3-pole, 4-wire, solid neutral), V (4-pole, 4-wire, switched neutral)
  • Enclosure: A (NEMA 1), C (NEMA 3R) - NEMA 1 is available on 100 amp load center models only.
  • Current Rating: 0100 (100 amps), 0200 (200 amps), 0400 (400 amps)
  • Connections: A (No load center), B (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.

Amps Description (Connections) Voltages Poles Phases WCR* RMS Symmetrical Amps
208 (C) 240 (F) 480 (M)
100 Standard (A) • 2 (N) 1 10,000
Standard, with load center (B) † • 2 (N) 1 10,000
Service entrance (ASE) • 2 (N) 1 22,000
Standard, 3-phase • • 3 (T) or 4 (V) 3 30,000
200 Standard (A) • 2 (N) 1 10,000
Service entrance (ASE) • 2 (N) 1 22,000
Standard, 3-phase (A) • • 3 (T) or 4 (V) 3 30,000
400 Standard (A) • 2 (N) 1 50,000
Service entrance (ASE) • 2 (N) 1 35,000
Standard, 3-phase (A) • • 3 (T) or 4 (V) 3 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.

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