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Asco 7000 Manual Transfer Switch (1Ph, 600A)

  • Asco 7000 NTS
  • Asco 7000 NTS - Inside
  • Asco 7000 NTS User Interface
  • Asco 7000 Microprocessor Controller
  • Asco 7000 Bypass Isolation Transfer Switch
Call with Options for Price Quote: 1-888-331-5344
320.00 LBS

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This Asco Series 7000 manual (non-automatic) transfer switch is ideal for mission critical applications with single phase loads up to 600A.


  • Electrically operated with manual control switches mounted locally or at remote locations.
  • Microprocessor based controller prevents inadvertent operation under low voltage conditions and allows for addition of optional accessories.
  • Low control circuit operating currents allow for long line runs between remotely mounted manual control switches and the transfer switch.
  • Source acceptability lights inform operator if sources are available to accept load.
  • Standard in-phase monitor can be activated for transferring motor loads.
  • Reliable and field-proven solenoid operating mechanism for high speed transfer of loads.
  • Conventional Open Transition (break-before-make) two-position transfer configuration. (Closed and Delayed Transition configurations available - see below.)
  • Optional Bypass Isolation models available - see below.
  • Programmable microprocessor controller with keypad and LCD display.
  • Industrial grade user interface with integrated controls and indicating lights.
  • Standard ground conductor connections.
  • Four auxiliary contacts, two contacts closed when switch is in normal position and two contacts closed when switch is in emergency position.
  • Centrally located terminal block for all customer control connections.
  • Local/remote communications capability for interfacing with ASCO PowerQuest® communication products.
  • Options of solid, switched, or overlapping neutral conductor - see below.
  • UL 1008 Listed and CSA Certified.
  • NEMA 1 indoor enclosure standard (with numerous other options - see below).


Asco Series 7000 Microprocessor Controller

  • asco4000-controller-in.jpgAdvanced digital microprocessor.
  • Voltage, frequency, control, timing, and diagnostic functions.
  • Microprocessor logic board is separated and isolated from the power board to improve electrical noise immunity performance and assure compliance with rigorous transient suppression standards.
  • Allows the user to easily access detailed information on: system, power source parameters, voltage, frequency and time delay settings, optional feature settings, historical event log, and system diagnostics.
  • A four line, 20 character LCD has a backlit display which enables easy viewing under all conditions (see Asco 7000 Brochure below for screen shots).
  • All screens can be navigated using only six buttons.
  • Touch pad programming of features and settings without the need for meters or variable power supplies.
  • On-board diagnostics provide control panel and ATS status information to analyze system performance.
  • Displays and counts down active timing functions.
  • Selectable multi-language display (English, German, Portuguese, Spanish, or French).
  • Password protection to prevent unauthorized tampering of settings.
  • For more detailed information, see 7000 Series Microprocessor Controller.

Asco Series 7000 User Interface

  • Manual transfer control switch for transferring load from normal to emergency, and back again.
  • Switch position indicating lights (16 mm, industrial grade LEDs).
  • Source acceptability indicating lights with true indication of the acceptability of each source, as determined by the voltage, frequency, voltage unbalance, and phase sequence settings of the control panel (16mm, industrial grade LEDs).
  • See diagram in the pictures above for layout.

Closed Transition Option

  • Features main contacts that overlap, permitting the transfer of electrical loads without power interruption.
  • Transfers in a make-before-break mode if both sources are within acceptable parameters.
  • Control logic continuously monitors source conditions and automatically determines whether the load transfer should be open (conventional non-overlap mode) or closed transition.
  • Closed-Transition transfer within 5 electrical degrees is achieved passively, without control of the engine generator set.
  • No additional control wire runs are required between the ATS and engine generator set governor.
  • Protective relaying may not be required under normal operation since the contact overlap time is less than 100 milliseconds (consult your local utility on protective relay requirements).
  • Extended parallel time protection standard. User interface provides visual indication when the pre-set extended parallel time has been exceeded. The controls automatically open the emergency or normal main contacts. Separate contact also available to shunt trip to an external breaker.
  • Failure to synchronize indication standard. User interface visually displays a failure to synchronize alarm if the time delay settings is exceeded, during closed transition transfer operation.
  • Transfer switch lock out with user interface indication standard. Prevents transfer in either direction if the extended parallel time is exceeded.
  • User interface alarm reset button. Resets extended parallel and failure to synchronize alarms.
  • Closed Transition bypass pushbutton on user interface allows transfer between sources in an open transition mode.
  • Please see the Asco 7000 Brochure below for withstand ratings (p5), screw-type terminal connections (p22), and dimensions/weights (p24,26).

Delayed Transition Option

  • Designed to provide transfer of loads between power sources with a timed load disconnect position for an adjustable time period.
  • Applications include older style variable frequency drives, rectifier banks, and load management applications.
  • Utilizes reliable, field proven solenoid operating mechanisms.
  • Mechanical interlocks to prevent direct connection of both sources.
  • Indicator light (LED type) for load disconnect position.
  • Adjustable time delay for load disconnect position.
  • Please see the Asco 7000 Brochure below for withstand ratings (p5), screw-type terminal connections (p22), and dimensions/weights (p24,26).

Bypass Isolation Option

  • Available in Open Transition, Closed Transition, and Delayed Transition configurations.
  • Allows the primary transfer switch to be inspected, tested, and maintained without any interruption of power to the load.
  • Provides redundant power transfer in the event the transfer switch is disabled or removed from service.
  • Bypass switch and transfer switch have identical electrical ratings.
  • Heavy duty mechanical interlocks prevent undesirable operation.
  • Bypass contacts carry current only during bypass mode.
  • Transfer switch is drawout design for ease of maintenance (see p6 of the Brochure below for details).
  • Bypass and isolation handles are permanently mounted. The bypass switch has dead front quick-make, quick-break operation for transferring of loads between live sources.
  • Bypass switch is fully rated for use as a manual 3-position transfer switch.
  • Bypass and isolation functions are simple, requiring a total of two operating handles.
  • No toggle switches, push buttons, selector switches or levers are required for bypass-isolation operation.
  • Mechanical indicators show bypass and transfer switch positions.
  • For more information and visual demonstration, please see these Asco 7000 Bypass Isolation videos.
  • Please see the Asco 7000 Brochure below for diagrams/pictures (p6-7), withstand ratings (p5), screw-type terminal connections (p22), and dimensions/weights (p25-26).


Asco 7000 Brochure

Asco 7000 Microprocessor Controller


  • Solid neutral with fully-rated terminals. (AL-CU) UL Listed.
  • Conventional neutral switching pole.
  • Overlapping neutral transfer contacts. Allows for proper ground-fault sensing and avoids generator voltage transients during transfer.


  • Other 50/60 Hz voltages up to 600 VAC.
  • Other Enclosures: Open Style, NEMA Type 3R, 4, 4X, or 12 (All NEMA Type enclosures available with a single door or secure double door).
  • Extended Warranties.


Time Delays

  • Accessory 2C - Provides an extended time delay on engine starting. The standard feature one time delay is adjustable from zero to six seconds. Accessory 2C allows this time delay to be adjustable from zero to sixty minutes in one second intervals factory set at five minutes.
  • Accessory 1G - Similar to accessory 2C except using 24 volt DC external input signal. 7000 Series controller remains active when both power sources are de-energized.
  • Accessory 1GB - Same as accessory 1G except using 120 volt AC external input.


  • Accessory 14A/14B - Additional auxiliary contact sets to indicate switch position. Two sets are standard. Specify total number of sets if more are required.
  • Accessory 18B - Two-pole, double-throw contacts operate when emergency source voltage is present at transfer switch terminals.
  • Accessory 18G - Two-pole, double-throw contacts operate when normal source voltage is present at transfer switch terminals.
  • Accessory 99 - “Push-to-Test” feature on all pilot light indicators.

Customer Control Circuits

  • Accessory 31Z - Selective load disconnect control contacts (two provided) which operate with time delay prior to and/or after load transfer and retransfer.

Extension Harness

  • Accessory 37B - Six foot (6’) extension harness to increase distance between transfer switch and control panel on open-type units.

Surge Protection

  • Accessory 73AC1 - ASCO Pulsar 450 rated 65KA. Normal source protection. (3Ø, 4wire WYE)
  • Accessory 73AC2 - ASCO Pulsar 450 rated 65KA. Emergency source protection. (3Ø, 4wire WYE)
  • Accessory 73AC3 - ASCO Pulsar 450 rated 65KA. Load side protection. (3Ø, 4wire WYE)

Bypass Isolation Accessories

  • Accessory 14A1 - Auxiliary contact to close in “Bypass to Normal” position.
  • Accessory 14B1 - Auxiliary contact to close in “Bypass to Emergency” position.
  • Accessory 14T - Auxiliary contact to close when transfer switch is in “Connected” position.
  • Accessory 14U - Auxiliary contact to close when transfer switch is in “Isolate” position.
  • Accessory 14V - Auxiliary contact to close when transfer switch is in “Test” position.

Special Applications

  • Accessory 45 - Custom Alphanumeric nameplate mounted on the front of the switch.
  • Accessory 111A - Generator - to - Generator for Standby Applications.
  • Accessory 111B - Generator - to - Generator for Prime Power Applications.
  • Accessory 125 - Seismic Certification to the requirements of the international building code for electrical equipment.
  • Accessory 131 - Certification of compliance with the American Recovery & Reinvestment ACT (Buy American Provision) - Must be specified at time of order placement.

Power Meters (See Accessories Tab)

  • Accessory 135L Power Meter 5210 - Offers local monitoring of power and energy information on the Asco 7000 load side. (Not compatible with other PowerQuest accessories when used with the Asco 7000. For interfacing capability, order the Power Manager 5220XP below.)
  • asco5220-sm.jpgPower Manager 5220 XP - provides real-time power monitoring of Asco 7000 transfer switches and other power systems via optional local LCD display or other PowerQuest interface products. Requires Accessory 72A or 72E.

Communications/Connectivity (See Accessories Tab)

  • Accessory 72A Serial Interface Module 5110 - For remote communications to ASCO PowerQuest® products.
  • asco5150-72e-sm.jpgAccessory 72E Ethernet Connectivity Module 5150 - For remote communications to ASCO PowerQuest® products. Contains embedded web pages for the remote monitoring of ASCO products, as well as some 3rd party devices.
  • Accessory 72SW Industrial Ethernet Switch - Mounted in the enclosure used in conjunction with a 5150 Connectivity Module (acc. 72E) metering device. Includes 2 available Ethernet ports and 2 multimode ST Fiber connectors.
  • Remote Connectivity Unit 5160 (RCU) - Provides 10 Ethernet and Dual-Fiber Optic connections in a NEMA 3R enclosure.

Remote Monitoring and Control (See Accessories Tab)

  • Single Channel 5310 Remote Annunciator - Provides remote monitoring and control of one Asco 7000 transfer switch. Requires Accessory 72E.
  • asco5350-sm.jpgEight Channel 5350 Remote Annunciator - Provides remote monitoring and control of up to eight Asco 7000 transfer switches. Requires Accessory 72E.
  • PowerQuest 5710 Essential Critical Power Management System - Offers monitoring and control of up to 32 devices from a web browser accessible server with a 23 inch touchscreen.
  • PowerQuest 5750 Professional Critical Power Management System - Offers monitoring and control of up to 64 devices from a web browser accessible server with a 23 inch touchscreen.
  • PowerQuest 5790 Enterprise Critical Power Management System - Offers monitoring and control of up to 128 devices from a web browser accessible server with a 23 inch touchscreen.
  • PowerQuest 5900 Custom Critical Power Management System - Offers the ultimate in monitoring and control customization, redundancy, and scalability.

Other options may be available. Please call to inquire.

Model Number / Configuration:
7NTS_20600F5C / Open Transition
240V (Up to 600V available)
60 Hz (50Hz also available)
Withstand Rating (Current Limiting Fuse):
200kA (600VAC Max) - Class L Fuse
Withstand Rating (Specific Breaker):
50kA (480VAC Max), 42kA (600VAC Max)
Withstand Rating (Time Based):
See p5 of Brochure for details
Screw-Type Terminal Connections:
(2) #1/0 AWG to 600 MCM
Cabinet Type:
NEMA 1 Indoor (Open Style and NEMA 3R, 4, 4X, 12 also available)
Service Entrance Rated:
Full Dimensions HxWxD (inches):
63 x 24 x 17
320 lbs.
Limited Warranty:
Call for Options
Please see the Brochure for specs on Closed Transition, Delayed Transition, and Byapss Isolation models
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