Kohler KEP Series Automatic Transfer Switches

Service Entrance Rated

Product Overview

The Kohler KEP Series Automatic Transfer Switches are designed for service entrance applications, providing reliable automatic switching between utility and standby power sources. These units incorporate isolating mechanisms and overcurrent protection directly on the utility supply, eliminating the need for separate upstream disconnects.

Controller: Decision-Maker® MPAC 1500

The Decision-Maker® MPAC 1500 Automatic Transfer Switch Controller is integrated into the KEP series. It offers advanced features for managing power transfer:

LCD display (4 lines x 20 characters, backlit)
Keypad and LCD for programming and viewing at the door
LED indicators for source availability, transfer switch position, service required (fault), and "not in auto"
Standard Modbus communication
Programmable voltage and frequency pickup/dropout settings
Programmable time delays
Programmable generator exerciser
Time-based and current-based load control (current sensing kit required)
Two programmable inputs and two programmable outputs (factory connections may use some)
Optional I/O extension modules (up to four)
RS-485 and Ethernet communication standards
Supports three-source systems and prime power applications

For detailed information, refer to specification sheet G11-128.

Transfer Switch Standard Features (Enclosed Contact Power Switching Units)

Service entrance automatic transfer switches with isolating mechanism and overcurrent protection on the utility supply.
UL 1008 listed, file #58962.
IBC seismic certification available.
Fully enclosed silver alloy contacts for high withstand rating.
3-cycle short circuit current withstand-tested per UL 1008.
Completely separate utility and generator set power switching units for redundancy and ease of service.
Utility disconnects feature overcurrent protection; generator disconnects are available with or without overcurrent protection.
Molded Case Circuit Breakers (MCCB) include thermal-magnetic or electronic trip overcurrent protection (80% rated).
Molded Case Switches (MCSW) do not include overcurrent protection (100% rated) (generator disconnect only).
Insulated Case Circuit Breakers (ICCB) include electronic trip overcurrent protection (100% rated).
Insulated Case Switches (ICSW) do not include overcurrent protection (100% rated) (generator disconnect only).
Inherent stored-energy design prevents damage during manual switching.
Heavy-duty brushless gear motor and operating mechanism with mechanical interlocking for long life and minimal maintenance.
Safe manual operation is supported even under adverse conditions.
All mechanical and control devices are visible and accessible.
Padlockable service disconnect control switch.
Status indicators.
Two-position control circuit isolation switch disconnects utility power to the controller.
Load shed capability (Forced transfer from Emergency to OFF) requires a customer-supplied signal (contact closure).
NEMA 1, 3R, 4X, and 12 enclosures are available.

Service Disconnect Switch

Service disconnect to OFF position.
Two-position switch with padlockable cover disconnects both normal and emergency sources.
Controller display shows "Service Disconnected" and the "NOT IN AUTO" LED flashes.
A lamp illuminates when the switch is in the DISCONNECT position.

Ratings

Power Switching Device Ratings

Power Switching Device	Current	Voltage, Frequency
Molded case (MCCB)	200 100-1200	208-240 VAC 60 Hz 208-480 VAC 60 Hz
Insulated Case (ICCB)	800-4000	208-480 VAC, 60 Hz

Withstand Current Ratings (in RMS Symmetrical Amperes)

(No upstream circuit breaker protection required)

Power Switching Device	Switch Rating, Amps RMS	Voltage, Max.	Amps RMS
Power Switching Device	Switch Rating, Amps RMS	Voltage, Max.	@ 240 V	@ 480 V
Molded case	100	600	65,000	25,000
	150	600	65,000	25,000
	200	240	100,000	NA
	250	600	65,000	65,000
	400		65,000	65,000
	600		65,000	50,000
800	600	65,000	50,000
1000	800	65,000	50,000
1200	800	65,000	50,000
Insulated case	800	600	100,000	100,000
	1000		100,000	100,000
	1200		100,000	100,000
	1600		100,000	100,000
	2000		100,000	100,000
2500	600	100,000	100,000
3000	600	100,000	100,000
4000	600	100,000	100,000

* With molded case/insulated case switching devices equipped with integral overcurrent protection. (UL 1008 WCR)

Typical Single-Line Diagram Description

The diagram illustrates a typical single-line connection for a service entrance automatic transfer switch. It depicts the Utility Supply connected to a Utility Power Switching Device (UCB) with a trip unit. This device is mechanically interlocked with a Generator Power Switching Device (GCB), which is non-automatic. A Removable Neutral Ground Bond Conductor is also shown. Both switching devices feed into the Customer Load. The diagram is labeled for a 3-pole model. The primary sources shown are the Utility Supply and the Standby Generator Set.

Application Data

Auxiliary Position-Indicating Contacts

MCCB Models	Use programmable digital outputs
ICCB Models	3 Normal, 2 Emergency Rated 2.5 A @ 24/48 VDC, 6 A @ 480VAC

Environmental Specifications

Parameter	Value
Operating Temperature	-15°C to 50°C (5°F to 122°F)
Storage Temperature	-20°C to 70°C (-4°F to 158°F)
Humidity	95% noncondensing

Cable Sizes (Al/Cu Wire)

Model	Amps	Cable Sizes, Al/Cu Wire
Model	Amps	Circuit Breaker (per Phase)	Neutral	Ground
KEP, MCCB	100	(1) #14 - 1/0 AWG	(3) #14 - 2/0 AWG	(3) #14 - 1/0 AWG
	150	(2) #2 - 4/0 AWG	(3) #14 - 2/0 AWG	(3) #14 - 1/0 AWG
	200	(1) #6 - 350 KCMIL	(3) #6 - 350 KCMIL	(3) #6 - 350 KCMIL
	250	(1) #6 - 350 KCMIL	(3) #6 - 350 KCMIL	(3) #6 - 350 KCMIL
	400	(2) 2/0 - 500 KCMIL	(6) 2/0 - 500 KCMIL	(3) #6 - 350 KCMIL
	600	(2) 2/0 - 500 KCMIL	(6) 2/0 - 500 KCMIL	(3) #6 - 350 KCMIL
	800	(3) 2/0 - 500 KCMIL	(9) 2/0 - 500 KCMIL	(3) #4 - 600 KCMIL or (6) 1/0 - 250 KCMIL
1000	(4) 4/0 - 500 KCMIL	(12) 4/0 - 500 KCMIL	(3) #4 - 600 KCMIL or (6) 1/0 - 250 KCMIL
1200	(4) 4/0 - 500 KCMIL	(12) 4/0 - 500 KCMIL	(3) #4 - 600 KCMIL or (6) 1/0 - 250 KCMIL
KEP, ICCB	800	(3) 3/0 - 750 KCMIL	(9) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL
	1000	(4) 3/0 - 750 KCMIL	(12) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL
	1200	(4) 3/0 - 750 KCMIL	(12) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL
	1600	(5) 3/0 - 750 KCMIL	(15) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL
	2000	(6) 3/0 - 750 KCMIL	(18) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL
	2500	(8) 3/0 - 750 KCMIL	(24) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL
	3000	(9) 3/0 - 750 KCMIL	(27) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL
	4000	(12) 3/0 - 750 KCMIL	(36) 3/0 - 750 KCMIL	(3) #6 - 250 KCMIL

Circuit Breaker Specifications

KEP Molded Case Circuit Breakers (MCCB)

Mfr	Amps	Model	Utility Disconnect			Generator Disconnect (note that units with MCSW selected will not have a trip unit)
Mfr	Amps	Model	Trip Unit Type	Trip Unit Function	Trip Unit Type	Trip Unit Function
ABB	100	Tmax Ts3	NI	BM/EL	TM	NI	BM/EL	TM
	150	Tmax Ts3	NI	BM/EL	TM	NI	BM/EL	TM
	200	Tmax Ts3	NI	BM/EL	TM	NI	BM/EL	TM
	250 2P/3P	Tmax T5	PR221	Electronic	LS/I	PR221	Electronic	LS/I
	250 4P	Isomax S5	PR211	Electronic	LI	PR211	Electronic	LI
	400	Tmax T6	PR221	Electronic	LS/I	PR221	Electronic	LS/I
	600	Tmax T6	PR221	Electronic	LS/I	PR221	Electronic	LS/I
	800	Tmax T6	PR221	Electronic	LS/I	PR221	Electronic	LS/I
	1000	Tmax T7	PR331/P	Electronic	LSIG	PR231/P	Electronic	LSIG
	1200	Tmax T7	PR331/P	Electronic	LSIG	PR231/P	Electronic	LSIG

NI = Non-interchangeable, BM/EL = Bimetal/Electromagnet, TM = Thermal/Magnetic, MCSW = Molded Case Switch

KEP Insulated Case Circuit Breakers (ICCB)

Mfr	Model	Amps	Utility Disconnect			Generator Disconnect (note that units with ICSW selected will not have a trip unit)
Mfr	Model	Amps	Trip Unit Type	Trip Unit Function	Trip Unit Type	Trip Unit Function
Schneider	NW	800	ML 5.0A	Electronic	LSI	ML 3.0	Electronic	LI
	NW	1000	ML 5.0A	Electronic	LSI	ML 3.0	Electronic	LI
	NW	1200	ML 5.0A	Electronic	LSI	ML 3.0	Electronic	LI
	NW	1600	ML 6.0A	Electronic	LSIG	ML 3.0	Electronic	LI
	NW	2000	ML 6.0A	Electronic	LSIG	ML 3.0	Electronic	LI
	NW	2500	ML 6.0A	Electronic	LSIG	ML 3.0	Electronic	LI
	NW	3000	ML 6.0A	Electronic	LSIG	ML 3.0	Electronic	LI
	NW	4000	ML 6.0A	Electronic	LSIG	ML 3.0	Electronic	LI

ICSW = Insulated Case Switch, ML = Micrologic

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 NEMA type 1 enclosures. Consult the factory for other enclosure types.

Molded Case Circuit Breaker (MCCB) Models

Model	Amps	Poles	Dimensions, mm (in.)			Weight, kg (lb.)			Dimension Drawing
Model	Amps	Poles	Height	Width	Depth	2P	3P	4P	Dimension Drawing
KEP, MCCB	100-150	2,3,4	914 (36.0)	725 (28.5)	462 (18.2)	68 (150)	68 (150)	68 (150)	ADV-8612
	200	2,3	914 (36.0)	725 (28.5)	462 (18.2)	68 (150)	68 (150)	N/A	ADV-8612
	250	2,3,4	914 (36.0)	725 (28.5)	462 (18.2)	81 (178)	81 (178)	81 (178)	ADV-8614
	400	2,3,4	1231 (48.4)	995 (39.2)	486 (19.1)	195 (430)	195 (430)	195 (430)	ADV-8614
	600-800	2,3,4	1231 (48.4)	995 (39.2)	486 (19.1)	200 (441)	200 (441)	200 (441)	ADV-8614
	1000-1200	3,4	2007 (79.0)	864 (34.0)	515 (20.3)	N/A	247 (545)	254 (560)	ADV-8996

Insulated Case Circuit Breaker (ICCB) Models

Model	Amps	Poles	Dimensions, mm (in.)			Weight, kg (lb.)			Dimension Drawing
Model	Amps	Poles	Height	Width	Depth	2P	3P	4P	Dimension Drawing
KEP, ICCB	800	3	2324 (91.5)	914 (36.0)	1219 (48.0)	544 (1200)			ADV-8618
		4	2324 (91.5)	914 (36.0)	1219 (48.0)		635 (1400)		ADV-8618
	1000-1200	3	2324 (91.5)	914 (36.0)	1219 (48.0)	553 (1220)			ADV-8618
		4	2324 (91.5)	914 (36.0)	1219 (48.0)		644 (1420)		ADV-8618
	1600	3	2324 (91.5)	914 (36.0)	1372 (54.0)	598 (1320)			ADV-8618
		4	2324 (91.5)	914 (36.0)	1372 (54.0)		625 (1380)		ADV-8618
	2000	3	2324 (91.5)	914 (36.0)	1372 (54.0)	607 (1340)			ADV-8618
		4	2324 (91.5)	914 (36.0)	1372 (54.0)		644 (1420)		ADV-8618
2500	3	2324 (91.5)	914 (36.0)	1524 (60.0)	625 (1380)			ADV-8618
	4	2324 (91.5)	1067 (42.0)	1524 (60.0)		662 (1460)		ADV-8618
3000	3	2324 (91.5)	914 (36.0)	1524 (60.0)	644 (1420)			ADV-8618
	4	2324 (91.5)	1067 (42.0)	1524 (60.0)		680 (1500)		ADV-8618
4000	3	2324 (91.5)	1372 (54.0)	1524 (60.0)	907 (2000)			ADV-8618
	4	2324 (91.5)	1372 (54.0)	1524 (60.0)		1270 (2800)		ADV-8618

Codes and Standards

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

EN61000-4-4 Fast Transient Immunity Severity Level 4
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
IEC 60947-6-1, Low Voltage Switchgear and Control Gear; Multifunction Equipment; Automatic Transfer Switching Equipment
IEEE Standard 446, IEEE Recommended Practice for Emergency and Standby Power Systems for Commercial and Industrial Applications
IEEE 472 (ANSI C37.90A) Ring Wave Test
NEMA Standard ICS 10-2005, Electromechanical AC Transfer Switch Equipment
NFPA 70, National Electrical Code
NFPA 99, Essential Electrical Systems for Health Care Facilities
NFPA 110, Emergency and Standby Power Systems
Underwriters Laboratories UL 1008, Standard for Automatic Transfer Switches for Use in Emergency Standby Systems file #58962

Accessories

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

Digital Meter *

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.

* Meter kit not available on MCCB models with NEMA 3R enclosures.

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 set of literature is included with each transfer switch).
Overhaul literature kit.

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 the transfer switches and enclosures shown below:

ATS Type and Size	Amps	Enclosure, NEMA Type:
Type	1	3R	4X	12
MCCB	100-600	●	●	●	●
MCCB	100-1200	●	●	●	●
ICCB	800-4000	●	●	●	●

Surge Protection Device (SPD)

SPD available for the normal source supply.
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 / 1A. 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.
See additional specifications below.

Extended Warranties

2-year basic
5-year basic
5-year comprehensive
10-year major components

Additional Controller Accessories

See the controller specification sheet for more information.

Alarm Module
External Battery Supply Module
Input/Output Module
High-Power Input/Output Module
Current Sensing Kit
Line-to-Neutral Voltage Monitoring
Padlockable User Interface Cover
Supervised Transfer Control Switch

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 3kAmps	at 10kAmp
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

Model Designation

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

Sample Model Designation: KEP-DMTA-0400S-NK

Category	Code	Description
Model	K	Kohler
Mechanism	E	Service Entrance Rated
Transition	P	Programmed
Controller	D	Decision-Maker® MPAC 1500, Automatic
Voltage/Frequency	C	208 Volts / 60 Hz
	F	240 Volts / 60 Hz
	K	440 Volts / 60 Hz
	M	480 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
	F	NEMA 4X
Current, Amps	0100
	0150
	0200
	0250
	0400
	0600
	0800
	1000
	1200
	1600
	2000
	2500
	3000
	4000
	Connections	S	Standard

Utility Switching Device			Generator Switching Device
Code	Description	Code	Description
M	MCCB w/thermal magnetic trip 100-200 A	K	MCSW 100-1200 A
N	MCCB w/electronic trip 250-800 A	M	MCCB w/thermal magnetic trip 100-200 A
P	MCCB w/electronic trip and GF 1000-1200 A	N	MCCB w/electronic trip 250-1200 A
R	ICCB w/electronic trip 800 A	Q	ICSW 800-4000 A
T	ICCB w/electronic trip and GF 1000-4000 A	R	ICCB w/electronic trip 800-4000 A

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

Contact Information

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

Distribution Information

DISTRIBUTED BY:

Disclaimer

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® generator distributor for availability.

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