Automatic Transfer Switches

Electrical power generation located at or near the point of it’s consumption, commonly referred to as Distributed Generation, has seen tremendous growth recently due to factors such as limited utility grid generation and transmission capacity combined with the onset of utility deregulation. Strong economic incentives now exist for many users to consider on-site self generation for both power reliability and energy cost reduction solutions. Additionally, these opportunities have spurred the development of new and unique types of generating and switching technologies.

The Closed Transition Soft Load Automatic Transfer and Peak Shaving Switches are just such a technology. Closed transition soft load transfer switches are an ideal solution for power availability, energy management, and generator-set testing applications. Unlike traditional open transition switches that provide a break-before-make operation, or passive closed transition switches which do not control the generator set, the closed transition soft load switch allows two power sources, usually the utility and a generator set, to be paralleled indefinitely. This permits the load, inductive or resistive, to be gradually and seamlessly transferred from one source to another. All of this is accomplished through the make-before-break operation of the switch with no power interruption to the load.


Special Transfer Switches

Closed Transition Soft Load Transfer Switches
Closed transition soft load transfer switches with active generator control allow the load to be gradually and seamlessly transferred from one source to the other. Closed transition soft load transfer switches are an ideal solution for power availability, energy management, and generator set exercising applications.


Closed Transition Soft Load Transfer

The CT series closed transition Soft Load transfer switch with active generator control is the ideal solution for applications requiring seamless transfers, critical power availability, energy management and generator set testing. Active control is the fastest and most reliable method of power source synchronization.

Features, Benefits and Functions

• Insulated case switching devices designed specifically for UL 1008.
• Drawout mounted SPB insulated case switches.
• High withstand, interrupting and closing ratings.
• "Seamless" transfer between power sources.
• Fastest switching time available (under 5 cycles).
• Mechanical and electrical interlocks.

Equipment Ratings

• Ratings available from 800 - 4000 amps.
• Available up to 600Vac.
• 2, 3, or 4 pole.
• Enclosures - NEMA 1 and 3R.
• Optionally Rated as Suitable for Service Entrance Equipment - no additional disconnect required.

Standards and Certifications

• Meets or exceeds all applicable standards.
• CSA Spec 178, UL 1008, UL 489, CSA, UBC and BOCA Seismic Zone 4, NFPA 110 and 99 (with certain options), EGSA 100S, NEMA ICS10, NEC Articles 517, 700, 701 and 702, ISO 9001, ISO 9002.