Eaton Electrical Magnum Transfer Switch manual Design Configuration

Instructional Booklet

Page 4 Effective: March 2007

Fixed and Drawout Magnum Transfer Switches

Basic Transfer Switch (Power Panel)

The basic transfer switch is designed for use with customer fur- nished logic. It is similar in design to the automatic version, except the intelligence circuit (logic panel) and voltage selection panel are omitted. All control devices are the customer’s responsibility.

Source 2

Source 1

Load

Figure 2. Typical Load Transfer Switch (Switching Device Type) Schematic.

Non-Automatic Transfer Switch (Electrically Operated)

Non-automatic transfer switches are manually initiated, electrically operated devices for applications where automatic load transfer is not required.

Bypass Isolation Transfer Switch

The bypass isolation switch is designed for applications where maintenance, inspection, and testing must be performed while maintaining continuous power to the load (Figures 3 and 4). This is typically required in critical life support systems and standby power situations calling for safe system maintenance with no power disruptions. Such a design allows for the quick removal of the different switching devices for inspection, maintenance, or replacement.

The ATS, non-automatic transfer switch (electrically operated), and bypass isolation transfer switch are the available types for the configuration described in this manual.

Operation of the ATS and the bypass isolation switch only are dis- cussed in this manual (Sections 5 and 7 respectively).

1.2.2 Design Configuration

The Eaton transfer switch is a rugged, compact design utilizing insulated case switches or insulated case circuit breakers to trans- fer essential loads from one power source to another. Open tran- sition switching devices are interlocked to prevent both switching devices from being closed at the same time. The versatile design, in addition to standard transfer functions, offers an optional inte- gral thermal and short circuit protection in either or both switching devices.

The switching devices are in a compact vertical arrangement. The logic can be easily disconnected from the switching device with- out disturbing critical connections. The enclosure is free standing, and, by using the specially supplied cleats, the switch is seismic approved (Option 42). The terminals are mounted in the rear of the switch, permitting rear, top, bottom, or side cable or bus bar entrance.

The switching devices have a high withstand rating (Table 1). The high-speed, stored-energy switching mechanism guarantees a transfer time of less than 5 cycles.

Figure 3.Typical Bypass Isolation Switch.

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