Welcome to Safety Test Switch
The ST Switch is a test block for interfacing substation devices (protection relays, fault recorders, revenue meters, ... ) to the voltage and current transformers and to other equipment on the system side of a power grid.
The ST Switch uses disconnect pins to isolate the substation devices from the system side equipment. Once isolated, secondary injection can be performed using banana jacks on the front side of the test block.
The design is such that an operator can easily see whether the internal contacts are open or closed.
There are no exposed metallic parts on the ST Switch, greatly increasing safety during testing.
|Keyed Disconnect Pins
Disconnect pins are keyed to the corresponding slots of the test block, preventing mistakes and errors during test.
|Integrated Status Window
A status window at the front indicates whether the internal contacts are open or closed.
Cabling connections are replicated from the FT Switch and offer maximum convenience for technicians and enigneers.
|Less Than 2 mO Internal Resistance
Thanks to the patented construction, ST Switches have an extremely low internal resistance. This decreases the burden placed on instrumentation transformers and also reduces heat dissipation inside cabinets and panels.
|Over 100 Models and Counting
Models with 8, 10, 12, 14, 16, 18 or 20 poles. Any combination of currents, voltages or trip signals. Custom labeling. The right ST Switch either already exists or can easily be created.
|Ideal for Retrofit of Older FT Switches
The 10-pole models use the same panel cutout as the older FT switches. Even the terminal labeling is the same. That means that you can have the increased safety and efficiency from the ST Switch without having to change your engineering drawings.