KOHLER

Model KSS Automatic Transfer Switches

Standard Specific-Breaker Rated

Transfer Switch Standard Features

UL 1008 listed at 208-480 VAC (file #E58962 for automatic, #E86894 for nonautomatic)
CSA certification available
IBC seismic certification available
Standard-transition operation
Silver tungsten alloy contacts on 400-600 amp models
Solid or switched neutral
Available with either automatic or non-automatic control (non-automatic control requires the Decision-Maker® MPAC 1200 controller)
Available in 2, 3, or 4 pole configurations
High withstand/closing ratings, for use with specific breakers only
Electrically operated, mechanically held mechanism
Double-throw, mechanically interlocked design (break-before-make power contacts)
Enclosed arc chambers with arc chutes
Front-accessible contacts for easy inspection
Main shaft auxiliary position-indicating contacts (see page 3 for contact ratings)
Standard one-year limited warranty. Extended limited warranties are available.

Available Controllers

Select one of the following controllers for your automatic transfer switch.

Decision-Maker® MPAC 750 Controller

Features:

Test pushbutton
Exercise pushbutton
LED indicators: Source available, transfer switch position, service required (fault), and “not in auto”
Programmable voltage pickup and dropout settings
Programmable time delays
Seven day generator exerciser
Two programmable inputs and two programmable outputs
Modbus communication standard
RS-485 communication standard
Ethernet communication optional

For more information about Decision-Maker® MPAC 750 features and functions, see specification sheet G11-126.

Decision-Maker® MPAC 1200 Controller

Features:

LCD display, 4 lines x 20 characters, backlit
Complete programming and viewing capability at the door using the keypad and LCD display
LED indicators: Source available, transfer switch position, service required (fault), and “not in auto”
Programmable voltage and frequency pickup and dropout settings
Programmable time delays
Programmable generator exerciser
Time-based load control
Two programmable inputs and two programmable outputs
Up to four I/O extension modules available
Modbus communication standard
RS-485 communication standard
Ethernet communication optional

For more information about Decision-Maker® MPAC 1200 features and functions, see specification sheet G11-127.

Ratings

Model	Current	Voltage, Frequency
KSS	40-600 amps	208-600 VAC, 50/60 Hz
KSS	800-1000 amps	208-480 VAC, 50/60 Hz

Codes and Standards

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

Underwriters Laboratories UL 1008, Standard for Automatic Transfer Switches for Use in Emergency Standby Systems (file #E58962 automatic, #E86894 nonautomatic)
CSA C22.2 No. 178 certification available (file #LR58301)
NFPA 70, National Electrical Code
NFPA 99, Essential Electrical Systems for Health Care Facilities
NFPA 110, Emergency and Standby Power Systems
IEEE Standard 446, IEEE Recommended Practice for Emergency and Standby Power Systems for Commercial and Industrial Applications
NEMA Standard ICS 10-2005, Electromechanical AC Transfer Switch Equipment
EN61000-4-4 Fast Transient Immunity Severity Level 4
IEC 60947-6-1, Low Voltage Switchgear and Control Gear; Multifunction Equipment; Automatic Transfer Switching Equipment
EN61000-4-5 Surge Immunity Class 4 (voltage sensing and programmable inputs only)
IEC Specifications for EMI/EMC Immunity: CISPR 11, Radiated Emissions; IEC 1000-4-2, Electrostatic Discharge; IEC 1000-4-3, Radiated Electromagnetic Fields; IEC 1000-4-4, Electrical Fast Transients (Bursts); IEC 1000-4-5, Surge Voltage; IEC 1000-4-6, Conducted RF Disturbances; IEC 1000-4-8, Magnetic Fields; IEC 1000-4-11, Voltage Dips and Interruptions
IEEE 472 (ANSI C37.90A) Ring Wave Test
Seismic certification in accordance with the International Building Code is available. (Accessory kit is required for seismic certification.)
IBC 2000, referencing ASCE 7-98 and ICC AC-156
IBC 2003, referencing ASCE 7-02 and ICC AC-156
IBC 2006, referencing ASCE 7-05 and ICC AC-156
IBC 2009, referencing ASCE 7-05 and ICC AC-156
IBC 2012, referencing ASCE 7-10 and ICC AC-156

Application Data

Environmental Specifications

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

UL-Listed Solderless Screw-Type Terminals for External Power Connections

Range of Wire Sizes, Copper or Aluminum*

Model	Switch Rating, Amps	Normal, Emergency, and Load	Neutral	Ground
KSS	40-150	(1) #8 to 3/0 AWG	(3) #6 - 3/0 AWG	(3) #6 - 3/0 AWG
	200-225	(1) #6 AWG to 250 KCMIL	(3) #4 - 600 KCMIL or (6) 1/0 - 250 KCMIL	(3) #4 - 600 KCMIL or (6) 1/0 - 250 KCMIL
	260	(1) #6 AWG to 350 KCMIL	(3) #4 - 600 KCMIL or (6) 1/0 - 250 KCMIL	(3) #4 - 600 KCMIL or (6) 1/0 - 250 KCMIL
	400	(1) #4 AWG to 600 KCMIL or (2) #6 AWG to 250 KCMIL	(6) #2 - 600 KCMIL	(6) #2 - 600 KCMIL
	600	(2) #2 AWG to 600 KCMIL	(12) #2 - 600 KCMIL	(12) #2 - 600 KCMIL
	800	(2) #1/0 AWG to 750 KCMIL	N/A	N/A
	1000	(4) #2 AWG to 600 KCMIL	N/A	N/A

* Use 60°C minimum wire for #14 to #1 AWG. Use 75°C minimum wire for 1/0 AWG and larger.

Contact Ratings

	Resistive Load	Inductive Load	Motor Load
			NC	NO
Engine Start Contacts	2 A @ 30 VDC	N/A	N/A	N/A
Auxiliary Contacts, (40-600A) ‡	15 A @ 250 VAC	N/A	N/A	N/A
Auxiliary Contacts, (800-1000A) ‡	15 A @ 480 VAC	15 A @ 250 VAC; 6 A @ 500 VAC	5 A @ 125 VAC; 3 A @ 250 VAC; 1.5 A @ 500 VAC	2.5 A @ 125 VAC; 1.5 A @ 250 VAC; 0.75 A @ 500 VAC

‡ Auxiliary position-indicating contacts, one set Normal and one set Emergency.

Weights and Dimensions

Note: Always use the transfer switch dimension drawing for planning and installation. Weights and dimensions may vary for different configurations. See your local distributor for dimension drawings.

Weights and dimensions are shown for transfer switches in NEMA type 1 and type 3R enclosures. Consult the factory for open units and other enclosures.

Amps	NEMA Type	Dimensions mm (in.)			Weight kg (lb.)			ADV Drawing
		Height	Width	Depth §	2-Pole	3-Pole	4-Pole
40-225	1, 3R	791 (31.1)	450 (17.7)	316 (12.5)	28 (62)	30 (65)	31 (68)	ADV-8584
260	1, 3R	1219 (48.0)	560 (22.0)	362 (14.3)	52 (115)	56 (123)	59 (131)	ADV-8586
400	1, 3R	1223 (48.1)	560 (22.0)	362 (14.3)	52 (115)	56 (123)	59 (131)	ADV-8588
600	1, 3R	1702 (67.0)	610 (24.0)	514 (20.2)	179 (395)	183 (403)	186 (410)	ADV-8590
800	1, 3R	1932 (76.1)	864 (34.0)	515 (20.3)	N/A	226 (498)	236 (520)	ADV-8592
1000	1, 3R	1932 (76.1)	864 (34.0)	515 (20.3)	N/A	231 (509)	241 (531)	ADV-8592

§ Allow enough room to fully open the door for inspection and service per NEC and local codes. The NEMA type 3R enclosures have a security cover on the controller that extends 54 mm (2.1 in.) beyond the door.

Withstand and Close-On Ratings (WCR)

Ratings Summary

The transfer switch is rated for use on a circuit capable of delivering not more than the RMS symmetrical Amperes listed at the specified maximum voltage below, but no greater than the interrupting capacity of the selected circuit breaker or fuse. Circuit breakers and fuses are supplied by the customer.

Certified Withstand Current Ratings in RMS Symmetrical Amperes

Switch Rating, Amps	With Current-Limiting Fuses		Specific Coordinated Breaker Rating, (see the following tables)			Any Breaker Ratings **			Time Duration, Seconds Max.
Switch Rating, Amps	Fuse Class	Fuse Size, Max Amps	Maximum Circuit Amps	Maximum Voltage	Maximum Circuit Amps	Maximum Voltage	Maximum Circuit Amps	Maximum Voltage	Time Duration, Seconds Max.
			480 VAC	600 VAC		480 VAC	600 VAC		480 VAC	600 VAC
40-150	J	400	200,000	200,000	600 V	30,000	22,000	600 V	10,000	10,000	0.025
200-225	J	400	200,000	N/A	600 V	30,000	22,000	600 V	10,000	10,000	N/A
260	N/A	N/A	N/A	N/A	480 V	35,000	N/A	N/A	N/A	N/A	N/A
400	J	600	200,000	200,000	600 V	50,000	42,000	600 V	35,000	35,000	0.050
400	RK5	600	100,000	N/A	600 V	50,000	42,000	600 V	35,000	35,000	0.050
600	RK1	600	N/A	N/A	600 V	50,000	42,000	N/A	N/A	N/A	N/A
800	L	3000	200,000	N/A	480 V	65,000	N/A	N/A	N/A	N/A	N/A
1000	L	4000

* All values are available symmetrical RMS Amperes and tested in accordance with the withstand/closing requirements of UL 1008.

** Applicable to breakers with instantaneous trip elements.

Ratings with Specific Manufacturers' Circuit Breakers

Molded-Case Circuit Breakers

Switch Rating, Amps	Voltage, Max.	WCR, Amps RMS	Manufacturer	Type	Max. Size, Amps
40-225	480	30,000	Eaton	FCL	100
				JGS, JGH, JGC, JGU, JGX, JBD, JD, HJD, JDC, LCL, LCLA	250
				LDC, CLDC, KDB, KD, HKD, KDC, LD, CLD, HLD, CHLD	400
			ITE/Siemens	CED6, HED4, HED6	125
				CFD6, FD6A, FXD6, HFD6, HFXD6, HHFD6, HHFXD6	250
				CJD6	400
			General Electric	SEL, SEP, THLC1	150
				THLC2	225
				SFH, SFL, SFP	250
				SGH, SGL, SGP, FGN, FGH, FGL, FGP	400
			Schneider	HG, HJ, HL, HR	150
				JJ, JL, JR	250
				LG, LJ, LL, LR	400
			600	22,000	Eaton	JGS, JGH, JGC, JGU, JGX, JDB, JD, HJD, JDC, LCL, LCLA	250
800	480	50,000		LDC, CLDC, KDB, KD, HKD, KDC, LD, CLD, HLD, CHLD	400
			ITE/Siemens	CED6, HED4, HED6	125
				CFD6, FD6, FXD6, HFD6, HFXD6, HHFD6, HHFXD6	250
			General Electric	SEL, SEP, THLC1	150
				THLC2	225
				SFH, SFL, SFP	250
				SGH, SGL, SGP, FGN, FGH, FGL, FGP	400
			Schneider	HG, HJ, HL, HR	150
				JJ, JL, JR	250
				LG, LJ, LL, LR	400
260	480	35,000	Eaton	HJD, JDC, JGC, JGH, JGU, JGX	250
				CHLD4, CLD, HLD4, CLDC, LDC, KDC, HKD, CHMDL4, CMDL4	400
				CHLD6, HDL6, CHMDL6, CMDL6, CLDC, CLD6, LDC6, CLDC6	600
				CHMDL8, HMDL8, MDL8, CMDL8	800
			ITE/Siemens	CFD6, HFD6, HFXD6, HHFD6, HHFXD6	250
			General Electric	SFL, SFP	250
				FGL, FGP	600
			Schneider	LJ, LL, LR	600
400	480	50,000	Eaton	JGU, JGX	250
				CLDC4, KDC, LDC4	400
				CLDC6, LDC6, NB Tri-Pac	600
				NB Tri-Pac	800
			ITE/Siemens	CFD6	250
				CJD6, SCLD6	400
				CLD6, HHLD6, HHLXD6, SCLD6	600
				CMD6, HMD6, HMXD6, SCMD6, SHMD6	800
600	600	42,000	General Electric	THLC1	150
				FGL4, FGP4, THLC4, TLB4	400
				SGL, SGP, FGL6, FGP6	600
				SKL8, SKP8	800
			Schneider	JL, JR	250
			Eaton	JGS, JGH, JGC, JGU, JGX, JBD, JD, HJD, JDC, LCL, LCLA	250
				LDC, CLDC, KDB, KD, HKD, KDC, LD, CLD, HLD, CHLD	400
				CED6, HED4, HED6	125
			ITE/Siemens	CFD6, FD6A, FXD6, HFD6, HFXD6, HHFD6, HHFXD6	250
			General Electric	SEL, SEP, THLC1	150
				THLC2	225
				SFH, SFL, SFP	250
				SGH, SGL, SGP, FGN, FGH, FGL, FGP	400
			Schneider	HG, HJ, HL, HR	150
				JJ, JL, JR	250
				LG, LJ, LL, LR	400
			Eaton	HJD, JDC, JGC, JGH, JGU, JGX	250
				CHLD4, CLD, HLD4, CLDC, LDC, KDC, HKD, CHMDL4, CMDL4	400
				CHLD6, HDL6, CHMDL6, CMDL6, CLDC, CLD6, LDC6, CLDC6	600
				CHMDL8, HMDL8, MDL8, CMDL8	800
			ITE/Siemens	CFD6, HFD6, HFXD6, HHFD6, HHFXD6	250
			General Electric	SFL, SFP	250
				FGL, FGP	600
			Schneider	LJ, LL, LR	600
			Eaton	JGU, JGX	250
				CLDC4, KDC, LDC4	400
				CLDC6, LDC6, NB Tri-Pac	600
				NB Tri-Pac	800
			ITE/Siemens	CFD6	250
				CJD6, SCLD6	400
				CLD6, HHLD6, HHLXD6, SCLD6	600
				CMD6, HMD6, HMXD6, SCMD6, SHMD6	800
			General Electric	THLC1	150
				FGL4, FGP4, THLC4, TLB4	400
				SGL, SGP, FGL6, FGP6	600
				SKL8, SKP8	800
			Schneider	JL, JR	250
			Eaton/ Cutler-Hammer	TRI-PAC NB, CHMDL, HMDL, CHND, HND, NDC, CNDC	800
				TRI-PAC NB, CNDC, NDC, CRDC, TRI-PAC PB, RDC, CHND, HND, RD. CRD	1200
			Schneider/ Square D	MJ, PJ, PL, RJ	800
				PJ, PL, RL	1000
			ITE/Siemens	CMD6, HMD6, SCMD6, SHMD6, CND6, HND6, SCND6, SHND6, CPD6	800
			General Electric	CND6, HND6, SCND6, CPD6, SHND6, HPD6	1200
				TB8, TC, THC, THP	1000
				THC, THP, TRP	1200

Transfer Switch Accessories

Accessories are available either factory-installed or as loose kits, unless otherwise noted.

CSA Certification
Digital Meter (with MPAC 1200 only): Measure and display voltage, current, frequency, and power for both sources; Programmable visual alarms for high voltage, low voltage, and high current; Three digital outputs; Serial port for optional network connections; Password-protected programming menus; Joystick operation. Factory-installed: Three digital outputs; Joystick operation.
Extended Limited Warranties: 2-year basic, 5-year basic, 5-year comprehensive, 10-year major components.
Export Packaging
Heater, Anti-Condensation: Hygrostat-controlled 120 VAC strip heater (customer-supplied voltage source required); 100 or 250 watts (sized for enclosure); Protective 15 amp circuit breaker.
Literature Kits: Production literature kit (one kit is included with each transfer switch); Overhaul literature kit.
Neutral Assembly: Available as loose kit for open units.
RSA III Remote Serial Annunciator: Monitors the generator set; Monitors Normal and Emergency source status and connection; Monitors ATS common alarm; Allows remote testing of the ATS. For more information, see specification sheet G6-139.

Seismic Certification

Certification depends on application and geographic location. Contact your distributor for details. Available for 40-1000 amp KSS models with NEMA 1, 3R, 4, 4X, and 12 enclosures.

Surge Protection Device (SPD)

Surge protection reduces transient voltages to harmless levels. Protection modes: L-L / L-N / L-G / N-G. Replaceable phase and neutral cartridges for service. Frequency: 50-60 Hz. Operating Temperature Range: -40 to 176°F (-40 to 80°C). Remote contacts for customer-supplied status indicators: Contacts: 1 NO, 1 NC; Min Load: 12VDC / 10 mA; Max. Load: 250 VAC / 1 A; Wire Size (max.): 16AWG. Fuse protection: 30 amps / 600 V. UL 1449, 3rd Edition for Type 2 applications; IEC 61-643-1, 2nd Edition T2/11.

SPD Specifications

Nominal Voltage (V ±15%)	Max. Discharge Current (kA)	Phase	Poles	UL VPR 3rd Ed (L-N/N-G/L-G) (kV)	Limiting Voltage, (L-N/N-G/L-G) (kV)		Short Circuit Withstand Current (kA)	Maximum Continuous Operating Voltage (VAC)
					at 3kA	at 10kA
240/120	40	Split	3	0.6/1.2/0.7	0.6/0.4/0.6	0.8/0.7/0.8	200	175/350
208/120	40	Wye	4	0.6/1.2/0.7	0.6/0.4/0.6	0.8/0.7/0.8	200	175/350
480/277	40	Wye	4	1.0/1.2/1.1	1.0/0.4/1.0	1.2/0.7/1.2	200	320/460
240/120	40	HLD	4	1.0/1.2/1.1	1.0/0.4/1.0	1.2/0.7/1.2	200	320/460
600/347	40	Wye	4	1.3/1.2/1.4	1.3/0.4/1.3	1.5/0.7/1.5	200	440/880

Additional Controller Accessories

See the controller spec sheet for more information.

Accessory Modules (with MPAC 1200 only): Alarm Module, External Battery Supply Module, Input/Output Module, High-Power Input/Output Module
Controller Disconnect Switch
Ethernet Communications
Current Sensing Kit (with MPAC 1200 only)
Line-to-Neutral Voltage Monitoring (with MPAC 1200 only)
Padlockable User Interface Cover
Supervised Transfer Control Switch (with MPAC 1200 only)

Model Designation

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

Sample Model Designation: KSS-JCNA-0100S

Model Components Breakdown:

Model: K: Kohler
Mechanism: S: Standard (Specific-Breaker)
Transition: S: Standard
Controller: A: Decision-Maker® MPAC 1200, Automatic; B: Decision-Maker® MPAC 1200, Non-Automatic; J: Decision-Maker® MPAC 750, Automatic
Voltage/Frequency: C: 208 Volts/60 Hz; D: 220 Volts/50 Hz; F: 240 Volts/60 Hz; G: 380 Volts/50 Hz; H: 400 Volts/50 Hz; J: 416 Volts/50 Hz; K: 440 Volts/60 Hz; M: 480 Volts/60 Hz; N: 600 Volts/60 Hz; P: 380 Volts/60 Hz; R: 220 Volts/60 Hz
Number of Poles/Wires: N: 2 Poles/3 Wires, Solid Neutral; T: 3 Poles/4 Wires, Solid Neutral; V: 4 Poles/4 Wires, Switched Neutral
Enclosure: A: NEMA 1; B: NEMA 12; C: NEMA 3R; D: NEMA 4; F: NEMA 4X; G: Open Unit
Current, Amps: 0040, 0080, 0100, 0150, 0200, 0225, 0260, 0400, 600, 800, 1000
Connections: S: Standard

Note: Some selections are not available for every model. Contact your Kohler distributor for availability.

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