Semikron SEMIPACK 1 Dual Thyristor Module — Model SKKT57B12E
The Semikron SKKT57B12E is a high-reliability, dual-SCR (Silicon Controlled Rectifier) thyristor module engineered for heavy-duty phase control, power regulation, and automation applications. Housed in the industry-standard SEMIPACK 1 package, this module features a thyristor-thyristor (SCR doubler) circuit configuration optimized for high-capacity protection and control infrastructure.
The device is constructed with a flame-retardant, high-dielectric cream polymer casing. The top profile features three primary heavy-gauge threaded power terminals (marked 1, 2, and 3) positioned alongside fast-on auxiliary control gate/cathode pins for secure signal coupling. An explicit internal circuit schematic and a matrix tracking code are etched directly onto the side of the housing for straightforward field verification.
Key Features
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Dual-SCR Doubler Topology: Integrates two series-connected phase-control thyristors within a single module, providing a compact building block for standard rectifier and AC power manipulation circuits.
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Superior Thermal Dissipation: Utilizes an advanced aluminum oxide (Al_2O_3) ceramic isolated metal baseplate that maximizes heat transfer to external sinks while ensuring 3000 Vrms electrical isolation.
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Hard Soldered Joints: Constructed with precision hard-soldered internal connections, significantly increasing reliability and thermal cycling lifetime under intensive load shifts.
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Global Safety Certifications: Fully recognized under UL file number E 63 532, verifying compliance with international industrial safety requirements.
Technical Specifications
| Feature | Specification |
| Product Type | Dual Thyristor (SCR-SCR) Power Module |
| Manufacturer | Semikron Danfoss |
| Model / Part Number | SKKT57B12E (MFG Item: 230B1677) |
| Package Type | SEMIPACK 1 |
| Repetitive Peak Voltages (V_RRM/V_DRM) | 1200 V |
| Average On-State Current (I_TAV) | 50 A (at Case Temperature T_C = 85degree C) |
| Continuous RMS Current (I_TRMS) | 95 A max. |
| Surge On-State Current (I_TSM) | 1250 A (at T_v = 125degree C; 10 ms pulse) |
| Critical Rate of Rise of Voltage (dv/dt) | 1000 V/s |
| Max. Virtual Junction Temperature (T_vj) | -40°C to +125°C |
| Isolation Voltage (V_isol) | 3000 Vrms (AC for 1 minute) |
| Dimensions (L x W x H) | 93mm x 20mm x 30 mm |
| Weight | Approx. 95 grams |
Applications
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AC Motor Soft Starters: Regulating voltage ramping profiles in industrial motor starters to minimize high inrush currents and mechanical wear.
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Industrial Temperature Control: Governing heavy resistive heating elements inside industrial kilns, polymer ovens, and chemical process reactors.
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DC Motor Drives: Serving as the core rectification and speed-control bridge component for heavy machine tools and manufacturing line positioners.
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Professional Studio & Theater Dimming: Delivering smooth, low-noise phase-angle power control for high-wattage lighting grids and entertainment setups.
