ABB PST105-600-70 Soft Starter – Obsolete PST Series Spare Part

Technical Dossier

Product Details And Specifications

ABB PST105-600-70 Soft Starter – Obsolete PST Series Spare Part

Technical Specifications

Note: Parameters listed are based on published ABB PST series documentation. Any site-specific configuration data should be verified against the original installation records. DriveKNMS does not fabricate or estimate electrical parameters.

Solving the Discontinued Hardware Crisis

The ABB PST series was a standard specification component in motor control centers installed across water treatment, mining, oil & gas, and heavy manufacturing facilities throughout the late 1990s and 2000s. ABB formally discontinued the PST line and transitioned its soft starter portfolio to the PSTX series — a product that is not a direct drop-in replacement and requires engineering rework to integrate into existing panel layouts.

The only rational strategy is to maintain a verified inventory of PST spare parts and execute a controlled, component-level maintenance program. Facilities that have adopted this approach have documented asset life extensions of 7 to 12 years beyond the original OEM support window, at a fraction of the capital cost of system replacement. The PST105-600-70 is one of the higher-current variants in the series and therefore one of the harder units to source — its failure in a critical pump or compressor application can halt production within minutes. Holding at least one verified spare on-site is not a luxury; it is a risk management decision.

Condition & Reliability Assurance

Sourcing obsolete industrial electronics from the secondary market carries real risk. DriveKNMS applies a structured 5-step quality process to every PST105-600-70 unit before it leaves our facility:

Key Features for System Maintenance

• Drop-in Replacement: The PST105-600-70 installs directly into existing PST-series panel positions. No mechanical modification to the MCC enclosure is required.
• No Reprogramming Required: Control wiring and parameter settings from the failed unit transfer directly. There is no PLC or SCADA reconfiguration needed, which eliminates the largest single cost driver in a typical soft starter replacement project.
• Avoids Engineering Rework: Unlike the PSTX migration path, a like-for-like PST replacement does not require new engineering drawings, updated panel schedules, or third-party commissioning. Your maintenance team can execute the swap.
• Protects Upstream Capital Assets: Soft starters protect motors from inrush current damage. Operating without a functional soft starter — or with a degraded unit — accelerates motor winding wear and increases the probability of a far more expensive motor failure event.
• Supports Long-Term Spares Strategy: For facilities with multiple PST105-600-70 installations, DriveKNMS can discuss bulk procurement to establish an on-site strategic spare inventory, reducing future sourcing risk as secondary market availability continues to decline.

Q: Should we buy more than one unit as a long-term reserve?
A: For any facility with more than two PST105-600-70 units in service, holding a minimum of one spare on-site is standard practice. Secondary market availability of PST series components is declining year over year. Units available today may not be available in 18 months. The cost of a planned spare purchase is a fraction of the cost of an unplanned production stoppage while sourcing a replacement under emergency conditions.