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Asco 4000 Manual Transfer Switch (1Ph, 100A)

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67.00 LBS

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This Asco Series 4000 manual transfer switch is electrically operated with manual control switches mounted locally or at remote locations. Designed for commercial, telecom, and industrial applications, this Asco 4000 transfers single phase loads up to 100A.


  • Reliable and field-proven solenoid operating mechanism for high speed transfer of loads.
  • Conventional Open Transition (break-before-make) two-position transfer configuration.
  • Programmable microprocessor controller with keypad and LCD display prevents inadvertent operation under low voltage conditions and provides for addition of optional accessories.
  • Industrial grade user interface with integrated controls and indicating lights.
  • Convenient one tine diagram with switch position and source acceptability LED indicators.
  • Low control circuit operating currents allow for long line runs between remotely mounted manual control switches and the transfer switch.
  • Standard inphase monitor can be activated for transferring motor loads.
  • 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.
  • Local/remote communications capability for interfacing with ASCO PowerQuest® or SiteWeb® communication products.
  • Solid neutral, with fully-rated terminals. (AL-CU) UL Listed.
  • NEMA 1 indoor enclosure standard (but see options below).
  • UL 1008 Listed and CSA Certified.


Asco Series 4000 Microprocessor Controller (Group 5)

  • 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 4000 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 transfer switch 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 4000 Series Microprocessor Controllers.

Asco Series 4000 User Interface

  • 4000-mts-interface-in2.jpgConvenient One Line Diagram - Provides a clear view of the position of the transfer switch, as well as the acceptability of the Normal and Emergency sources.
  • Source Acceptability LEDs - Provide true indication of the acceptability of each source, as determined by the voltage, frequency, voltage unbalance, and phase sequence settings of the control panel.
  • Transfer Switch Position LEDs - Provide an indication of which source the transfer switch is connected to.
  • Transfer to Emergency Button - Allows the user to transfer the load to the emergency source. Must be pressed and held 15 seconds or until the generator starts and runs.
  • Transfer to Normal Button - Allows the user to transfer the load back to the normal power source when acceptability has been restored.
  • Lamp Test Button - Provides a convenient way to verify the functionality of all LEDs on the User Interface.
  • User Controls Locked - Visually displays the status of the keypad lock feature of the control panel. When illuminated, the buttons of the User Interface are disabled and the user must enter a password into the control panel to unlock the switch. When LED is blinking, the controls are temporarily unlocked for five minutes from the last button pressed.


Asco 4000 Brochure

Asco 4000 Microprocessor Controller

TRANSFER SWITCH OPTIONS (Please Call for Pricing)

  • No neutral or Switched neutral.
  • Other 50/60 Hz voltages up to 600 VAC.
  • Other Enclosures: Open Style, NEMA Type 3R, 4, 4X, or 12.
  • Extended Warranties.


Please see the Accessories Tab above for more information and to order. Accessories ordered with your transfer switch will be factory-installed (as applicable).

  • asco4000-18z-sm.jpgAccessory 18Z Relay Board - Includes one Form C contact (Rated 2A @ 30VDC or 0.5A@ 125VAC) for each of the following: Normal Source Acceptability, Emergency Source Acceptability, Selective Load Disconnect (Pre and post transfer signal time delay for selective load disconnect with a programmable bypass on source failures - adjustable 0 to 5 minutes), and Fourth contact can be set to mimic the acceptability contacts or annunciate any combination of the acceptability contacts and/or any switch alarm conditions available. Extends eninge starting time delay up to 60 seconds.
  • Accessory 14A/14B Auxiliary Contacts - Additional auxiliary contact sets to indicate switch position (two sets come standard).
  • acc-44g-sm.jpgAccessory 44A Strip Heater - Prevents condensation and freezing of condensation. External 120 volt power source required. Includes thermostat.
  • Accessory 44G Strip Heater - Prevents condensation and freezing of condensation. Wired to load terminals. Includes thermostat.
  • Accessory 135L Power Meter 5210 - offers local monitoring of power and energy information on the Asco 4000 load side. (Not compatible with other PowerQuest accessories when used with the Asco 4000. For interfacing capability, order the Power Manager 5220XP below.)
  • Accessory 72A Serial Interface Module 5110 - for remote communications to ASCO PowerQuest® or SiteWeb® products. Also allows 4000 Series Transfer Switches to communicate via Modbus/RTU.
  • Accessory 72E Ethernet Connectivity Module 5150 - for remote communications to ASCO PowerQuest® or SiteWeb® products. Contains embedded web pages for the remote monitoring of ASCO products, as well as some 3rd party devices. Also provides Serial-to-Ethernet link with ability to communicate using Modbus/TCP.
  • asco5220-sm.jpgPower Manager 5220 XP - provides real-time power monitoring of Asco 4000 transfer switches and other power systems via optional local LCD display or other PowerQuest interface products. Requires Accessory 72A or 72E.
  • Single Channel 5310 Remote Annunciator - Provides remote monitoring and control of one Asco 4000 transfer switch. Requires Accessory 72E.
  • Eight Channel 5350 Remote Annunciator - Provides remote monitoring and control of up to eight Asco 4000 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.
  • Other options may be available. Please call to inquire.
Model Number:
60 Hz
Withstand Rating:
200kA with current limiting fuses (up to 480VAC); 10kA with circuit breakers
(1) #14 to 4/0 AWG
Cabinet Type:
NEMA 1 Indoor (See Options)
Service Entrance Rated:
Full Dimensions HxWxD (inches):
48 x 18 x 13
67 lbs.
Limited Warranty:
24 month
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