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GTO Replacements for the following applications:
   DARRAH provides technical support for mounting and replacement procedures. We also STOCK a complete line of mounting clamps and GTO Gate Drives. Freewheeling DIODES and Snubber DIODES are also available. Partial List of Darrah's GTO Product Line: ABB Gate Turn-off Thyristors, GTO Inventory
Westcode Gate Turn-off Thyristors, GTO Inventory
Dynex Gate Turn-off Thyristors, GTO Inventory
DARRAH provides cross-referencing for obsolete and difficult to find types. We offer replacements for the following manufacturers:  Traction Gate Drivers for GTO Thyristors 
ABB Gate Drivers are designed for triggering large Gate-Turn-Off Thyristors (GTO) featuring gate-turn-off
currents up to 3000 Amps and off-state voltages up to 4500 volts.The control signal, transmitted via fiber optics, controls the output valve of the gate driver. A feedback signal, also transmitted via fiber optics, is used to check that the gate driver and GTO are operating properly. This GTO Gate Driver was developed for use in traction systems and is currently being used successfully by numerous customers. Among these customers are locomotives in the United States, Italy, Finland, Netherlands, Switzerland and German railways.
Power Supplies for GTO Gate Drivers ABB offers Power Supplies developed to match the properties of the GTO Gate Drivers. The input of the Power Supply is designed for use with batteries. Typical battery inputs are 24 Volts, 36 Volts, 72 Volts, and 110 Volts. The output from the Power Supply to the GTO Gate Driver is ± 48 Volts, 16 kHZ square wave voltage.
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Darrah
Electric Company now provides off the shelf delivery of GATE TURN OFF THYRISTORS, GTO's.
Available
in all common sizes and ratings. Darrah is stocking VOLTAGES to 6.5 KV, and in CURRENTS to 4000 Amps.
DARRAH offers Symmetrical, Asymmetrical and Reverse Conducting types.