Product Overview
International Rectifier IRKT57-10 Dual SCR Power Module on Finned Heat Sink
Condition
Used power module assembly. Evaluation: Visual inspection only. Function testing not performed. Pre-mounted to a black anodized extruded aluminum heatsink with thermal compound applied. Module body stamped with IOR logo, ITALY, and UL mark E78996.
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Product Overview
International Rectifier IRKT57-10 (catalog IRKT57/10) dual thyristor module pre-mounted to a multi-fin aluminum heatsink. Built in an ADD-A-PAK package with an electrically isolated baseplate, this module features a series-connected SCR pair designed for high-power phase angle regulation and AC line control. The assembly includes three heavy-duty M5 screw power terminals with captive washers and faston control tabs.
Key Features
- Dual SCR series thyristor configuration (IRKT circuit layout)
- 1000V repetitive peak off-state and reverse voltage rating
- Electrically isolated baseplate with 2500V RMS insulation
- Pre-mounted to heavy-duty black anodized extruded aluminum heatsink
- Three M5 screw terminals with captive pressure plates for main connections
- Auxiliary faston gate and cathode control terminals
- Heatsink dimensions measure 5.5 inches long by 4.75 inches wide
Applications
- Retrofitting industrial motor speed controllers and soft starters on shop machinery
- Building high-current AC phase angle power controls for heating elements and kilns
- Fabricating heavy-duty DC power supplies, plating rectifiers, and battery charger banks
- Serving as a bench power control block for shop equipment builds and custom welders
Frequently Asked Questions
What are the terminal connections on this assembly?
The top of the module features three M5 screw terminals for the main AC power and load connections, along with push-on faston spade tabs for the thyristor gate triggers and cathode returns.
Can this module be unbolted from the heatsink?
Yes. The module is secured with two machine screws through its baseplate into the heatsink deck and can be removed if needed.
What am I taking on with an untested used power semiconductor?
This assembly is visually inspected and sold as-is with function testing not performed. The detailed photographs show the actual module, terminals, and heatsink you receive.
Bolted to a serious chunk of finned aluminum, this classic Italian-built IOR module is ready to soak up thermal spikes and switch real current. Put it to work on your next high-power bench build or drive retrofit.
