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

When a SKKH570/16E fails on the production floor, the conversation shifts immediately from maintenance to capital expenditure. Legacy DC drive systems and rectifier assemblies built around this module are not modular by design — replacing the power stack means re-engineering the entire drive cabinet, re-commissioning motor control loops, and in many cases, halting a production line that has run continuously for 15 to 25 years. Conservative estimates place the total cost of a forced system upgrade — including new drives, engineering hours, installation, and lost production — in the range of several hundred thousand to over one million USD per line. The SKKH570/16E is discontinued. SEMIKRON no longer manufactures this part. DriveKNMS holds verified physical stock. That distinction matters.

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.

Sourcing a genuine SKKH570/16E extends the operational life of the entire drive system by 5 to 10 years at a fraction of the cost of a system replacement. A single module replacement, including labor, typically costs under USD 5,000. A forced system upgrade on a comparable drive — new drive cabinet, motor re-commissioning, control system integration, production downtime — rarely costs less than USD 300,000. The arithmetic is not complicated. The challenge is finding the part.

DriveKNMS specializes in exactly this problem. We maintain physical inventory of discontinued SEMIKRON modules, sourced through authorized channels and verified before dispatch. We do not list parts we cannot ship.

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.

We disclose condition accurately: new old stock (NOS), tested surplus, or professionally refurbished. We do not represent refurbished units as new. If you require a specific condition grade, state it in your inquiry.

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.

This matters operationally. A maintenance team can execute a module replacement during a scheduled shutdown window — typically 4 to 8 hours — without involving the OEM, without a controls engineer on-site, and without any change to the drive's existing tuning parameters. The alternative — a system upgrade — requires OEM involvement, extended downtime, and in regulated industries, re-certification of the modified equipment.

Maintaining a small strategic inventory of SKKH570/16E modules eliminates unplanned downtime risk entirely for facilities where this module is installed. The cost of holding two spare modules is negligible against the cost of a single unplanned production stoppage. For facilities with multiple identical drive systems, a shared spare pool across units is a standard asset protection practice.

FAQ

What warranty applies to discontinued parts?
DriveKNMS provides a 90-day functional warranty on all tested and refurbished units, and a 180-day warranty on verified new old stock (NOS) units. Warranty covers failure under normal operating conditions. It does not cover damage resulting from incorrect installation or operation outside rated parameters.

How do I confirm the unit is genuine and not counterfeit?
We provide date code documentation, test records, and high-resolution photographs of the actual unit prior to shipment on request. For high-value orders, third-party inspection can be arranged. We do not source from unverified brokers.

Should I hold strategic stock of this part?
If your facility operates equipment that uses the SKKH570/16E, yes. This part is confirmed discontinued. Available market inventory is finite and decreasing. Lead times from secondary market sources will increase over time. Holding one to three units per drive system is a standard risk mitigation practice for asset-intensive operations.

Can you supply multiple units?
Contact us with your quantity requirement. We will confirm available stock and provide a formal quotation. For large quantity requirements, we can advise on sourcing timelines.