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Product Overview: SPAU140C
The SPAU140C is a numerical synchro-check and voltage-measuring relay originally produced by ABB to verify safe conditions for closing circuit breakers between two electrical systems. It combines dual, independent measurement channels with microprocessor-based logic to assess voltage magnitude, phase angle difference and frequency deviation between incoming and busbar voltages, and issues permissive or blocking signals for breaker closing when preset thresholds are satisfied. The device supports both traditional synchro-check functions — ensuring phase and frequency synchronism for paralleling — and voltage-check functions that confirm a de-energized section can be safely connected to an energized network. Designed for switchgear and substation applications, the SPAU140C simplifies synchronizing tasks while providing continuous self-supervision and event logging for post-fault analysis.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | ABB (legacy product) |
| Product type | Numerical synchro-check / voltage measuring relay |
| Model / part number | SPAU140C |
| Measurement inputs | Two voltage measurement channels (for both sides of a circuit breaker) |
| Voltage input ranges | Multiple energizing input ranges (e.g., 100 V, 110 V; variant dependent) |
| Frequency range | 45–65 Hz (typical) |
| Permissible phase angle difference | Configurable trip/close thresholds (degrees) |
| Dimensions (approx.) | 140 mm × 140 mm × 60 mm (panel mounting module). |
| Weight (typical) | ~0.8 kg (net). |
| Communications / ports | Serial port for SPA bus / RS-485 variants on specific codes |
| Environmental / operating | Indoor switchgear use; industrial ambient ranges per datasheet |
| Status | Legacy / discontinued product family (support and spares available through distributors and service channels) |
| (Verify precise energizing voltages, programmable thresholds and accessory options with the factory datasheet before installation.) |
SPAJ140C
Related products: SPAU140C and its family variants
The SPAU140C appears in several catalog variants and sub-codes which denote different communication ports, energizing voltage options or accessory sockets; examples commonly found in inventories include SPAU140C-AA, SPAU140C-DA, and codes listing RS-488 or RS-485 interfaces. Complementary or alternative relays used in the same protection and control workflow include modular numerical synchronizing relays from ABB’s legacy SPA family and modern replacements in ABB’s current protection portfolio. When a direct replacement is not available, customers often select approved retrofit or upgrade products that provide equivalent synchro-check and voltage-check functions together with modern communications. Always confirm cross-reference information with ABB or an authorized distributor prior to procurement to ensure mechanical, electrical and firmware compatibility.
Maintenance suggestions: Schedule periodic visual inspections to verify tightness of terminal connections, absence of corrosion and integrity of the panel gasket. Use the relay’s event log and local indicators to review any recorded abnormalities and to trend repetitive transient conditions that may indicate upstream instability. If firmware updates or calibration actions are required, follow the manufacturer or authorized service guidance; maintain configuration backups before applying changes so setpoints and logic can be restored quickly. For legacy equipment such as the SPAU140C, consider keeping at least one qualified spare module or a tested refurbished unit in stock to allow rapid swap-out, and engage accredited service centers for repairs to preserve warranty terms that distributors may offer.
Application fields: SPAU140C
The SPAU140C is used where safe and repeatable connection of network sections or generator sets is required. Typical applications include paralleling of synchronous generators to a common bus, closing ring main segments in distribution substations, connecting utility or auxiliary sources to an energized bus and controlled re-energization of feeders. The relay is appropriate in industrial power plants, municipal substations, marine power centers and large commercial facilities where controlled breaker closing reduces mechanical and thermal stress on rotating equipment and minimizes customer interruptions. In retrofit projects and brownfield automation, the SPAU140C often serves as a direct functional replacement where panel dimensions and wiring constraints preclude a full upgrade; its measured values and output contacts feed permissive interlocks in both manual and automatic synchronizing schemes. Where higher-level SCADA or automation is available, the relay’s event records and status outputs support coordinated control and post-event analysis, helping drive reliability improvements across the installation.
Product guarantee: Our company provides a one-year quality warranty service for the SPAU140C, covering hardware malfunctions not caused by human factors. During the warranty period, if the SPAU140C shows abnormal performance or functional failure, we will provide replacement services. For discontinued or legacy models, our global supply channels and authorized refurbishment partners enable expedited sourcing of verified spares and tested exchanges to reduce equipment downtime. We assist customers with product verification, configuration backup best practices and coordination with accredited repair centers so the relay can be returned to service promptly. Contact our sales team to confirm stock status and warranty terms for specific part codes or refurbished units.
Contact: Whatsapp: +86 18859254943 E-mail: sales@ygplc.com
