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Automatic Transfer Switch

C O N T E N T S

Series A200/A300 Series 940 Series 962 Series 436

MANUFACTURERS

ASCO

Automatic Transfer Switch

ASCO

Power Failure Protection

Where would you be without a constant flow of electrical power? We often take for granted that power will always be there when we need it. In reality, power failures are very common. And when the power goes out, your business suffers. The answer is to install an Automatic Transfer Switch, commonly referred to as an ATS. An Automatic Transfer Switch with built-in control logic monitors your normal power supply and senses any interruptions. If the utility power was to fail, the ATS will automatically start the engine and then transfer the load to the backup generator after the generator has reached proper voltage and frequency. When the utility power has been restored the ATS will automatically switch the load back, and after a time delay shut the engine generator off. With an Automatic Transfer Switch you are protected 24 hours a day, seven days a week.

Series A200/A300 ATS

4 UL 1008 listed for total system loads 4 Complies with IEC 947-6-1 4 Meets National Electric Code requirements 4 IP31, IP54, General purpose (Type 1), Raintight (Type 3 R), Weatherproof (Type 4) or Oil Tight (Type 12), Enclosures source outages to delay all transfer switch and engine-starting signals 4 Transfer to emergency time delay Adjustable from 0 to 5 minutes for controlled timing of load transfer to emergency 4 Retransfer to normal time delay Adjustable to 30 minutes 4 5-minute unloaded running time delay for emergency generator cool down

Standard Selectable Features

4 Inphase monitor to transfer motor loads, without any intentional off time, to prevent inrush currents from exceeding normal starting levels 4 Selective load disconnect, doublethrow contact to operate at an adjustable 0 to 20 second time delay prior to transfer and reset 0 to 20 seconds after transfer 4 Engine exerciser to automatically test engine generator each week Includes control switch for testing with or without load

Voltage & Frequency Sensing

4 Adjustable close differential voltage sensing on all phases of normal source 4 Pickup voltage is adjustable to 95% of nominal; drop-out is adjustable from 70 to 90% of nominal 4 Voltage and frequency sensing of emergency 4 Selectable for single or three phase operation, 50 or 60 Hz

ATS Features

4 30 to 2000 amps in a compact design 4 Available to 480 volts AC, single or three phase 4 True double-throw, inherently interlocked construction 4 Mechanically held, electrically operated utilizing a reliable field-proven, single-solenoid operator 4 Contacts easily accessible for easy inspection and preventive maintenance 4 Supplied with switched or solid neutral termination

Control and Display Panel

4 Switch position lights 4 Source availability lights 4 Engine exerciser switch with status light 4 Test switch 4 Time delay bypass switch

Time Delays

4 Adjustable time delay to override momentary normal

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Automatic Transfer Switch

ASCO

Series 940 Automatic Transfer Switches

4 Listed under UL 1008, CSA certified: UL listed through 480 VAC; CSA certified through 600 VAC 4 Accessories UL Recognized 4 Wide contact gaps for positive isolation of sources 4 Compact design 4 Modular construction for maximum installation flexibility 4 Silver-plated copper bus 4 Segmented main contacts on all switches rated 600 amps and over 4 Main contacts are protected by arc tips or arcing contacts 4 High-speed transfer for all classes of loads 4 UL-listed Al-CU terminal lugs standard on switches rated 30-2000 amps (bus connections are provided on switches rated 3000 - 4000 amp) 4 Switch position indicating contacts and signal lights

Performance Features

4 Meets all automatic transfer switch requirements of: NFPA 110, Emergency and Standby Power Systems NFPA 99, Essential Electrical Systems for Health Care Facilities NFPA 70, National Electrical Code

Electrical Features

4 4 4 4 4 Sizes from 30 through 4000 amps. Available to 600 VAC, 50 or 60 Hz. Fully rated, opend or enclosed Rated for all classes of loads 100% tungsten load rating through 400 amps. 4 Designed for emergency and standby applications

Construction Features

4 True double-throw, inherently interlocked construction 4 Mechanically-held, electrically-operated 4 Reliable single-solenoid operating mechanism 4 Contacts readily accessible for easy inspection and preventive maintenance

Ordering Information

4 To order an Series 940 Automatic Transfer Switch, complete the following catalog number:

Product 940

Poles 2, 3, or 4 (4 pole on 1000 - 2000 amp; for other amp sizes specify Acc. 28 switched neutral - option.)

Amperes continuous rating 30, 70, 100, 150, 260, 400, 600, 800, 1000, 1200, 1600, 2000, 3000, 4000

Voltage Code 4,6,9, or X (see chart below)

Control Panel 6 or 7 Use 6 for 1 phase, or 7 for 3 phase

Options Leave blank if no Acc. ordered, or use X and list Acc. needed.

Enclosure Leave blank if open type, or use C for Type 1 or specify other Type.

Catalog Number example above is 940340097XC (X could be for Accessory 28).

Voltage Codes for 3 Pole Switches

Number of Switch Poles

3 3 3

System Voltage

208 Y / 120 V 4 Wire Wye 60 Hz 220 to 240 V 3 Wire Delta 60 Hz 480 Y / 277 V 4 Wire Wye 60 Hz or 440 to 480 V Delta other voltages

Voltage Code To Use

4 6 9

3

X

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Automatic Transfer Switch

ASCO

Series 962 Automatic Transfer & Bypass-Isolation Switches

4 Indicator lights show source availability and source feeding load 4 Source-to source bypass accomplished without reenergizing automatic transfer switch load terminals 4 Regenerative load voltages cannot backfeed automatic transfer switch during source-to-source bypass. 4 Listed under UL 1008, CSA certified: UL listed through 480 VAC; CSA certified through 600 VAC 4 Bypass switch can be operated to either available source - even with the automatic transfer switch removed from service 4 Rotary handle operation for bypassing and isolating transfer switch 4 No power cables to disconnect to remove automatic transfer switch 4 Visual indication of bypass-isolation switch position 4 Fail-safe mechanical interlocks assure proper sequence of operation 4 Simple and unique design assures maximum reliability 4 Prominent and detailed instruction plate 4 All power interconnections silver-plated copper bus bar. Eliminates costly field interconnections between automatic transfer switch and bypass switch 4 UL-listed Al-CU terminal lugs standard on switches rated 150-2000 amps (bus connections are provided on switches rated 3000 - 4000 amp)

Performance Features Electrical Features

4 Sizes from 150 through 4000 amps. 4 Incorporates series 940 Automatic Transfer Switch 4 No momentary disconnection of neutral during transfer with unique overlapping neutral switching pole. 4 Transfer switch can be tested eletrically without disturbing the load 4 Bypass and automatic transfer switch contacts have same rating 4 Capable of switching load circuits from one source to the other under all conditions 4 Indicator lights show source availability and source feeding load 4 Meets all automatic transfer switch requirements of: NFPA 110, Emergency and Standby Power Systems NFPA 99, Essential Electrical Systems for Health Care Facilities NFPA 70, National Electrical Code

Construction Features

4 Automatic transfer switch is drawout design to facilitate maintenance 4 Space-saving design 4 Bypass contacts are in power circuit only during bypass and do not carry current continuously

Ordering Information

4 To order an Series 962 Automatic Transfer & Bypass-Isolation Switch, complete the following catalog number:

Product 962

Poles 2, 3, or 4 (4 pole on 1000 - 2000 amp; for other amp sizes specify Acc. 28 switched neutral - option.)

Amperes continuous rating 150, 260, 400, 600, 800, 1000, 1200, 1600, 2000, 3000, 4000

Voltage Code Control Panel 4,6,9, or X (see chart below) 6 or 7 Use 6 for 1 phase, or 7 for 3 phase

Options Leave blank if no Acc. ordered, or use X and list Acc. needed.

Enclosure Leave blank if open type, or use C for Type 1 or specify other Type.

Catalog Number example above is 962380097XC (X could be for Accessory 28).

Voltage Codes for 3 Pole Switches

Number of Switch Poles

3 3 3

System Voltage

208 Y / 120 V 4 Wire Wye 60 Hz 220 to 240 V 3 Wire Delta 60 Hz 480 Y / 277 V 4 Wire Wye 60 Hz or 440 to 480 V Delta other voltages

Voltage Code To Use

4 6 9

3

X

245

Automatic Transfer Switch

ASCO

Series 436 Automatic Closed Transition Transfer Switches

4 Rated for all classes of loads. 4 100% tungsten load ratings through 400 amps. 4 Designed for emergency and standby applications. 4 High interrupting capacity. 4 UL listed through 480VAC in accordance with UL 1008. 4 Reliable solenoid operating mechanism. 4 Contact readily accessible for easy inspection and preventive maintenance. 4 Wide contact gaps. 4 Compact designs. 4 Modular construction for maximum installation flexibility. 4 Silver-plated copper bus. 4 Segmented contacts on all switches rated 600 amps and over. 4 Main contacts are protected by arc tips or arcing contacts. 4 High-speed transfer for all classes of loads. 4 UL-listed AL-CU terminal lugs. 4 All components designed for transfer switch service. 4 Switch position indicating contacts and signal lights.:

Performance Features

4 Zero interruption of power during transfer and retransfer when conditions permit. 4 Actual overlap of sources during closed transition operation does not exceed 100 milliseconds. 4 Conventional break-before-make "open transition" if one source fails.

Electrical Features

4 Sizes from 260 through 4000 amps. 4 Available to 600VAC, 50 or 60 Hz, 250VDC. 4 Fully rated, open or enclosed.

Construction Features

4 Mechanically-held, electrically-operated.

Ordering Information for ASCO® 436 Automactic Closed Transition Transfer Switches

436

Product Code

No. of Poles

2, 3

Continuous Ampere Rating

260 400 600 800 1000 1200 1600 2000 3000 4000

Voltage Code

2 Poles Voltage Code 110 to 120V 3 1ø 2 Wire 60 Hz 208 to 240V 6 1ø 2 Wire or 60 Hz 440 to 480V 9 1ø 2 Wire or 1ø 3 Wire 60 Hz Other Voltages 3 Poles Voltage Code 208Y/120 4 4 Wire Wye 60 Hz 220 to 240V 6 3 Wire Delta 480Y/277 4 Wire Wye or 440 to 480V Delta 60 Hz Other Voltages 9

Control Panels

Group Type Code 1-Phase 3-Phase 6 7

Options

Enclosure

Leave Blank Leave Blank for No for Open Options. Type. "C" "X" indicates Indicates NEMA Type Options 1. Or Specify List. Other Type Required.

X

X

The catalog number for an ASCO 436, 3-pole, 400-amp, 480-volt, 4-wire, 60 Hz switch in a NEMA Type 1 enclosure is: 436340097C.

Withstand current ratings for ASCO 436

Available Symmetrical Amperes RMS at 480 Volts AC

Switch Rating (amps)

260 400 600 800 1000 1200 1600 2000 3000 4000

When Used with Current-Limiting Fuses Max. Fuse WCR Size (amps)

200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 200,000 600 600 1200 1200 2000 2000 3000 6000 6000 6000

When Used with Circuit Breakers WCR with Specific WCR with Any Circuit Breaker Circuit Breaker

42,000 42,000 65,000 65,000 85,000 85,000 100,000 100,000 100,000 100,000 35,000 35,000 50,000 50,000 65,000 65,000 100,000 100,000 100,000 100,000

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Information

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