SEMIKRON SKKH570/16E Thyristor Power Module – Obsolete SKKH Series Spare Part

Technical Dossier

Product Details And Specifications

SEMIKRON SKKH570/16E Thyristor Power Module – Obsolete SKKH Series Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Note: All parameters listed are sourced from SEMIKRON's original published datasheets. No values have been extrapolated or estimated. If your application requires confirmation of a specific parameter not listed here, contact our technical team before ordering.

Solving the Discontinued Hardware Crisis

The SKKH570/16E occupies a specific and non-interchangeable role in high-current SCR rectifier stacks. In a six-pulse or twelve-pulse thyristor bridge — the topology of choice for industrial DC drives rated above 200 kW — each module position carries defined voltage and current ratings that cannot be substituted with a different-rated device without recalculating the entire thermal and electrical balance of the assembly.

Facilities running Siemens SIMOREG, ABB DCS800, or Eurotherm 590-series DC drives frequently encounter this module in the power stack. These drive platforms were engineered for 20-30 year service lives and remain in active use across steel mills, paper machines, mining hoists, and port cranes worldwide. The control electronics on these platforms are often still fully functional. The mechanical drivetrain they serve — gearboxes, motors, couplings — may have decades of remaining service life. The only failure point is the power semiconductor.

Condition & Reliability Assurance

Discontinued power semiconductors present specific reliability risks that new-production parts do not. Electrolytic capacitors in associated gate drive circuits age regardless of whether the equipment has been operated. Storage conditions affect semiconductor junction integrity. Counterfeit modules — a documented problem in the obsolete parts market — can fail immediately under load or, more dangerously, fail intermittently.

Every SKKH570/16E unit dispatched by DriveKNMS passes a five-stage verification process:

• Visual and mechanical inspection: Housing integrity, terminal condition, pin corrosion assessment, and label authenticity verification against known-genuine SEMIKRON markings.
• Electrolytic capacitor assessment: Where applicable in associated assemblies, capacitor ESR and capacitance are measured against specification. Aged capacitors are flagged and disclosed.
• Firmware and date code verification: Date codes are recorded and cross-referenced. Parts with date codes inconsistent with claimed storage history are quarantined.
• Electrical parameter testing: Forward voltage drop, leakage current, and gate trigger characteristics are measured and recorded. Results are available on request.
• Thermal interface inspection: Mounting surface flatness and thermal compound condition are checked. Modules are re-prepared for installation where required.

Key Features for System Maintenance

The SKKH570/16E is a direct drop-in replacement for the original module position in any assembly designed around this part number. No firmware changes are required. No control system reconfiguration is necessary. No engineering re-qualification of the drive is triggered by a like-for-like module swap.