Siemens 3RF2950-0KA16 Solid-State Relay – Obsolete SIRIUS Series Spare Part

Technical Dossier

Product Details And Specifications

Siemens 3RF2950-0KA16 Solid-State Relay – Obsolete SIRIUS Series Spare Part

DriveKNMS reviews sourcing options for this model through RFQ handling before quotation.

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

Technical Specifications

Solving the Discontinued Hardware Crisis

The Siemens SIRIUS 3RF29 series solid-state relays were widely deployed across process industries — chemical, oil & gas, food processing, and utilities — throughout the 1990s and 2000s. Their integration into motor control centers and distributed control panels was deep by design: the relay's switching characteristics, load ratings, and physical form factor were engineered to fit specific panel slots and wiring schemes that have no direct modern equivalent without mechanical and electrical rework.

When Siemens discontinued the 3RF2950-0KA16, it did not provide a drop-in successor with identical mounting dimensions and terminal configurations. Facilities that did not stockpile spares at end-of-life announcement now face a hard choice: source from the secondary market or commit to a panel retrofit that touches every downstream component.

For plant managers operating under capital expenditure constraints, the secondary market is not a fallback — it is the only rational strategy. A verified 3RF2950-0KA16 from a qualified supplier extends the operational life of an entire control panel by years, at a fraction of the cost of engineering a replacement architecture.

How to extend your automation asset life by 5–10 years using critical spare parts:

Condition & Reliability Assurance

Sourcing discontinued industrial components from the secondary market carries inherent risk. DriveKNMS applies a structured 5-step qualification process to every unit before it is offered for sale:

1. Visual and mechanical inspection. Each unit is examined for physical damage, pin corrosion, terminal oxidation, and housing integrity. Units with evidence of field abuse or improper storage are rejected at this stage.
2. Electrolytic capacitor assessment. Aged solid-state relays are susceptible to capacitor degradation — a failure mode that produces intermittent switching behavior before catastrophic failure. We assess capacitor condition as a standard step, not an exception.
3. Firmware and configuration verification. Where applicable, internal configuration states are verified against known factory baselines. Units with corrupted or non-standard configurations are flagged and disclosed.
4. Functional electrical test. Each unit undergoes load switching verification under controlled conditions to confirm that switching response, leakage current, and thermal behavior fall within specification.
5. Packaging and storage compliance. Units are stored and shipped in ESD-safe packaging with humidity control. Shelf life integrity is maintained from our warehouse to your facility.

Key Features for System Maintenance

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.