Specifications

100 – 1000 Amps
SL-20610 (R 11/02) 5
hours. To the fullest extent practical, redundant circuits and components shall be used to eliminate single
points of failure.
1.4.5.2 Power Supply
Redundant power supplies shall be provided to prevent any single-point power supply failure mode. The
STS shall have two completely separate power supplies mounted on separate boards so a power supply
can be replaced while the load is on bypass. There shall be two separate DC buses, one from each power
supply, to provide redundancy through out the controls.
1.4.5.3 Logic
Control logic shall be triple redundant. Each of the three logic modules shall have it’s own separate power
connection to each power supply bus. Each logic module shall be fused to prevent it from shorting the
power supplies if an internal failure occurs. Gating and control logic shall be partitioned so that failure of
one source’s gating or sensing logic does not prevent the switch from transferring to the other source.
1.4.5.4 Components
All electrical components requiring normal maintenance or repair shall be replaceable without de-
energizing the load, assuming that at least one source is available. Solid-state switching devices shall be
packaged to allow safe repair of the switching devices without having to de-energize the load. All molded
case switches or non-auto circuit breakers shall be of a plug-in or draw-out type to allow replacement
without de-energizing the load. All control and logic components shall be mounted separate from the
power components.
1.4.5.5 Fuseless
No fuses are to be used to protect the solid-state power switching devices. All solid-state power switching
devices shall be rated to prevent hazardous device failure in power systems with available fault currents
up to [(100,000 amps @208V)(65,000 amps @480V) (25,000 amps @ 600V)].
1.4.5.6 Access
The STS shall be designed for front access only. The STS shall be designed so all installation, repairs and
maintenance can be done from the front or top of the unit. The STS shall be designed to minimize the
exposure of hazardous voltages to allow safe servicing of the unit while the load is energized. Barriers
shall be used on and round customer connections to protect personnel during maintenance.
1.5 DOCUMENTATION
1.5.1 Equipment Manual
The manufacturer shall furnish an installation, operation and maintenance manual with installation, start-
up, operation, and maintenance instructions for the specified system.
1.5.2 Proposal Submittals
Submittals with the proposal shall include:
• A system one-line diagrams.
• Outline drawing including weights, dimensions, heat dissipation, and recommended service
clearances.
• Location and detailed layouts of customer power and control connections.