Kohler RXT Automatic Transfer Switch: Features, Specifications, and Ratings

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 (mounted on the generator set).
UL listed.
Models with load centers are UL 67 listed (file #E251086).
Models without load centers are UL 1008 listed (file #E58962).
CSA certified (file #LR58301), not applicable to service entrance models.
Features a corrosion-resistant NEMA 3R aluminum enclosure:
- Padlockable
- Approved for indoor or outdoor installation
- ANSI 49 gray finish
Contactor is electrically and mechanically interlocked.
Double throw inherently interlocked design.
Contactor is manually operable for maintenance purposes.
Equipped with silver alloy main contacts.
Transfer switches are 100% equipment rated and can be applied at the rated current without derating (for non-service entrance models).
Available in 100, 200, and 400 amp standard and service entrance models (refer to page 6 for available models).
100 amp standard single-phase models are available with or without a 16-space load center. These can accommodate up to 8 tandem breakers for a total of 24 circuits.
Service entrance models include a disconnect circuit breaker on the utility (normal) source side (80% rated).
Comes with a five-year limited warranty.
Optional status indicator is available:
- LED indicators for source availability and contactor position.
- Allows viewing of transfer switch status without removing the enclosure cover.

Specifications

Environmental Specifications

Parameter	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

Parameter	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
Switch Size, Amps	Switch	Phases	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) #2 - 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
200	3-Phase	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
400	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
400	3-pole 208-240 V	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
	3 or 4 pole 480 V	3	(2) #6 - 250 MCM	(2) #6 - 250 MCM	(1) #4 - 600 MCM (2) 1/0 - 250 MCM	(3) #14 - 1/0 AWG

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 other loads does not exceed the switch 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 are suitable for control of motors, electric discharge lamps, tungsten filament lamps, and electric heating equipment under similar load conditions as described above.

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.

WCR Ratings with Specific Manufacturer's Molded-Case Circuit Breakers (240 VAC)

Switch Rating, Amps	Voltage, max.	Number of Poles/ Phases	WCR, RMS Symmetrical Amps	Manufacturer	Type or Class	Maximum Size, Amps
Switch Rating, Amps	Voltage, max.	Number of Poles/ Phases	WCR, RMS Symmetrical Amps	Manufacturer		Maximum Size, Amps
100	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 FI, FC, FA, FH	150 100
				Square D	QOM1, QOM1-VH Q2, Q2-H. Q2H	125 175
				Siemens	QOM2, QOM2-VH QB, QD, QG, GJ	225 250
					CED6, ED2, ED4, ED6, HED4, HED6, QP(Q2125), QPH(Q2125H) QJ2, QJH2	125
				GE	THQB, THQC, THHQB, THHQC THHQL, TQDL, THQDL SE, TQD, THQD, THED	150 125 150
					CSR/BHW, FD, HFD	225
				Eaton/Cutler-Hammer	JD, JDB, HJD JDC	225-250 250
					DK, KD, KDB, HKD, KDC, LCL, LA	400
				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	250
200	240	2 pole/ 1 phase	10,000		TQDL, THQDL	125
				GE	THLC2 SF	225 250
				Eaton/Cutler-Hammer	JD, JDB, HJD	225-250
400	240	1 phase	50,000	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
				ITE/Siemens	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
				GE	SGHA, FGN, FGL, FGP	600
				Merlin Gerin	CJ600N, CJ600H	600
				ABB	T5, T6	600
				Note on 80% continuous load: If any of the following breakers are 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	LA, LH, LC, LI, LE, LX, LXI	400
				ITE/Siemens	NJGA, HJGA, LJGA, JXD2, JD6, JXD6, HJD6, HJXD6, HHJD6, HHJXD6, CJD6, SJD6, SHJD6, SCJD6	400
100	480	3 pole/ 3 phase	30,000	Cutler-Hammer	FDC, HFD HJD, JDC	150 250
					HKD, KD, KDB, KDC, LA TRI-PAC, LCL	400
				Square D	FC, FI KC, KH, KI	100 250
					LA, LC, LE, LH, LI, LX, LXI	400
				ITE/Siemens	CED6, HED4, HED6 CFD6, FD6, FXD6, HFD6	125 250
					CJD6, HJD6, HHJD6, HHJXD6, JD6, JXD6, SCJD6, SHJD6, SJD6	400
200	480	4 pole/ 3 phase	30,000	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	LD, LDB, HLD, LDC, CLD, CHLD, CLDC MDL, HMDL, NB	600 800
				Square D	LC, LI, LE, LX, LXI, DG, DJ, DL	600
				ITE/Siemens	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
400	480	3 pole/ 3 phase	50,000	GE	SGHA, FGN, FGL, FGP	600
				Merlin Gerin	CJ600N, CJ600H	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	DK, KDB, KD, CKD, HKD, CHKD, KDC, LCL, LA TRIPAC	400
				Square D	LA, LH, LC, LI, LE, LX, LXI	400
				ITE/Siemens	NJGA, HJGA, LJGA, JXD2, JD6, JXD6, HJD6, HJXD6, HHJD6, HHJXD6, CJD6, SJD6, SHJD6, SCJD6	400
				Merlin Gerin	CJ400N, CJ400H, CJ400L	400
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
				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
				ABB

Dimensions and Weights

The following table provides the physical dimensions and shipping weights for the Kohler RXT Automatic Transfer Switch models.

Diagram Description: A diagram illustrates the dimensions of the transfer switch enclosure, showing Height (H), Width (W), and Depth (D*).

Amps	Description	Dimensions, H x W x D, mm (in.) *	Shipping Weight †
			kg (lb.)
100	Single phase	620 x 335 x 180 (24.4 x 13.2 x 7.1)	7 (15)
	With load center	620 x 335 x 180 (24.4 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)
200	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)
	Service Entrance	731 x 416 x 175 (28.8 x 16.4 x 6.9)	14 (30)
400	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.

Component	Description
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	C: NEMA 3R
Current Rating	Numbers indicate the current rating of the switch in amperes: 0100, 0200, 0400
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 with NEMA 3R aluminum enclosures. Letters in parentheses refer to the model designation code described above.

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.

† 16-space load center. Up to 8 tandem breakers can be used, for a maximum of 24 circuits.

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