ASCO Power Technologies Products Digital Binder

4000 SERIES Power Switching Solutions

Automatic and Non-Automatic Transfer Switch

Open Transition Transfer Switching

Power Knowledge

Power Knowledge

ASCO Transfer Switches are available in both automatic and non-automatic initiation types. For automatic transfer switches, the controller initiates transfer. For non-automatic transfer switches, a user initiates transfer between power sources using local or remote switches. 4000 SERIES Transfer Switches have the following features:

ASCO Transfer Switches are available in standard, 2-position, open transition models that reliably transfer loads in less than 100 milliseconds. Open transition switches are suitable for a wide range of applications.

Transferring Motor Loads between Power Sources

Non-Automatic and Manual Transfer Switches for Backup Power Applications

• 30 to 4000 amps • Single-operator switching mechanism prevents simultaneous connection of both sources

• Available In-Phase Monitor can be activated for transferring motor loads

• Sizes from 30 through 4000 amps • Microprocessor controller provides for addition of optional accessories • Controller prevents inadvertent operation under low-voltage conditions

• Low control circuit currents allow for long distances between remotely mounted manual control switches and the transfer switch • Source acceptability lights signal when to transfer

Transition Mode Basics

Delayed Transition Transfer Switching

Transferring Loads with Zero Power Interruption

ASCO Delayed Transition Transfer Switches transfer loads between power sources using a timed, load, disconnect position with an adjustable delay. Applications include distribution systems with motor and other inductive loads as well as load management applications.

Electrically Operated Bypass-Isolation Transfer Switch

Product Details

The ASCO 4000 SERIES Bypass Isolation Transfer Switch can shunt its primary transfer mechanism at the touch of a button using an electrical operator. This allows the transfer switch mechanism to be isolated for testing and maintenance without interrupting power to the load. It also provides emergency transfer capability if the primary switch mechanism is disabled or removed.

• 150 through 4000 amps • Mechanical interlocks to prevent interconnection of both sources

• LED Indicator for load disconnect position • Adjustable time delay for load disconnect position

Electric Bypass-Isolation Transfer Switches

• Single-touch bypass controls • One-line diagram for intuitive status indication • LEDs indicate permitted and restricted operations • Intelligent self-diagnostics streamline troubleshooting

• Automated logging facilities evaluation and review of historical events • Adjustable delay and trip settings enable site-specific transfer sequences

Closed Transition Transfer Switching

ASCO Automatic Closed Transition Transfer Switches overlap the normal and emergency source to transfer without power interruption. These switches transfers in a make-before-break sequence if both power sources are within acceptable parameters. Control logic continuously monitors source conditions and automatically selects open or closed transition according to real-time values.

• Available 150 through 4000 amps • Closed Transition Transfer occurs passively without directly controlling the engine-generator set

• Overlap time is less than 100 milliseconds • Indications for failure-to-synchronize and extended parallel time

Tens of Milliseconds

Seconds to Minutes

<100 Milliseconds

Emergency

Normal

Emergency

Normal

Emergency

Normal

VOLTAGE

VOLTAGE

VOLTAGE

TIME

TIME

TIME

Open Transition

Delayed Transition

Closed Transition

Electrically Operated Bypass-Isolation Transfer Switch

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