ASCO Automatic Transfer Switches are the standard of the industry. High speed transfer of loads between alternate sources of power, regardless of ampacity size, is achieved by a reliable, field proven solenoid operating mechanism. When combined with a programmable microprocessor controller with keypad and LCD display, they offer the most advanced method of transferring all types of loads, such as motors, electronic drives, UPS's and microprocessor based systems. 7000 Series automatic transfer switches are available open or enclosed, in ampacity sizes from 30 through 4000 amperes with the largest selection of optional accessories offered anywhere.

ASCO 7000 Series Power Transfer Switches Product Features

	Conventional two-position transfer configuration, plus closed and delayed transition modes of operation. All configurations available with either automatic or non-automatic control.
	Available in bypass-isolation configuration. The bypass and isolation features allow power transfer switches to be inspected, tested, and maintained without any interruption of power to the load.
	UL listed to 1008 Transfer Switch Equipment & CSA certified to CSA 22.2 No. 178-1978 Automatic Transfer Switches

Benefits

	Reliable and field-proven solenoid operating mechanism ensures maximum performance
	High withstand and close-on ratings including 30 cycle withstand current rating provides optimum flexibility in circuit breaker coordination (600-4000 amperes).
	Local or Remote serial communication options provide user flexibility.

Basic Transfer Switch Components

1. Transfer Switch

A device which transfers electrical loads between two dissimilar sources of power
by using either manual or automatic controls. 

2. Microprocessor Controller (Group 5 Control Panel)

	Digital Microprocessor
	LCD display and Touch pad key
	Display and counts down active timing function
	Password protection
	3 phases Over & Under Voltage Sensing on N & E w/ accuracy +/- 1%
	Under & Over Frequency Sensing on N & E w/ accuracy +/- 0.2%
	Phase Sequence Sensing
	Advanced In-phase Transfer
	99 Events Log with Time and Date of Events
	Statistic ATS/System Monitoring Data
	16 Standard Time Delays
	7 Programmable Independent Engine Exerciser
	Serial Port Communication

Different Type of Power Switching Solutions

1.1 Open Transition Transfer Switch  (Break Before Make)

	One set of contacts open before the other set close.
	Load is disconnected from power during all transfers.

Control Switches and Indicating Lights for Conventional 2-Position Switches

	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).
	Three position (16mm, industrial grade type) selector switch:
	Automatic: Normal maintained position.
	Test: Momentary position to simulate normal source failure for system test function.
	Reset Delay Bypass: Momentary position to bypass transfer and re-transfer time delay

1.2 Closed Transition Transfer Switch (Make Before Break)

	Two sets of contact are in parallel not more than 100 msec.
	Maintain power supply to load during re-transfer.

Control Switches and Indicating Lights for Closed Transition Switches

Automatic Closed-Transition Transfer Switches feature main contacts that overlap, permitting the transfer of electrical loads without power interruption. The switch 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. Available 150 through 4000 amperes. 

Closed-Transition Transfer within 5 electrical degrees is achieved passively, without control of the engine generator set. Therefore, no additional control wire runs are required between the ATS and engine generator set governor. Plus, 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). 

Failure to synchronize indication and extended parallel time protection is built-in to all 7000 Series closed transition controls to prevent abnormal operation. 

Closed Transition Transfer Benefits Maintains Power to the Loads Minimizes Inrush Currents Reduces Stress on UPS Peak load shaving Better Periodic Testing and Avoid Reluctance to Test Anticipated Power Failure

ASCO Automatic Transfer & Bypass-Isolation Switches are available in open transition, closed transition and delayed transition designs.
The bypass and isolation features allow power transfer switches to be inspected, tested, and maintained without any interruption
of power to the load.

	Available 150 to 4000 amperes.
	Allows bypass-isolation without load interruption.
	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.
	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.
	600-1200 ampere units available in shallow depth, front connected or rear connected designs

Automatic Transfer Bypass-Isolation Switching Benefits No Interruption Maintenance of Transfer Switch For Installation Which Cannot Have Shut Down (24 Hr X 365 Days Operation) For Critical Application Needs 2nd Back-up Transfer Switch. For Testing Emergency System Without Load Interruption. For Load that required 99.9999% Power Reliability (0.53 Minutes A year).