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Help CenterABB SPAU341C1-AA (RS488003-AA) – Multifunction Voltage & Frequency Protection for Utility and Industrial Power Systems
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Warranty: 365 days
Delivery: 1 week for in-stock items; no more than one month at the latest
Payment: 50% advance payment; full payment before delivery
Express delivery: FedEx, UPS, DHL
Voltage and frequency protection (multifunction): Typically includes over/under-voltage and over/under-frequency elements; many users also enable rate-of-change-of-frequency (df/dt) for fast islanding detection.
Three-phase or single-phase measurement: Works with standard VT inputs, making retrofits on MV switchgear and generator panels straightforward.
Flexible logic and timers: Definite-time and, in many cases, inverse/graded delay options help coordinate with upstream/downstream protection.
Robust trip and alarm outputs: Multiple relay outputs for breaker trip, lockout, and alarm signaling; a watchdog contact for health monitoring is commonly provided.
SPA-bus over RS‑485 (variant dependent): The RS488003-AA code seems to match an RS‑485-enabled configuration for remote parameterization and event readout.
On-device diagnostics and LEDs: Clear indication of active elements, starts, trips, and self-supervision status for quick troubleshooting on site.
Proven SPACOM hardware: Withdrawable case, reliable terminals, and stable measurement make it appealing for plants standardizing on ABB.
| Brand / Model | ABB SPAU341C1-AA (Order code: RS488003-AA) |
| HS Code | 853649 (Electrical relays, other) |
| Power Requirements | Typically 80–265 V AC/DC (variant dependent; confirm on the unit rating label) |
| Operating Temperature | –10 to +55 °C typical for SPACOM-series devices |
| Signal Input Types | 3-phase VT inputs for voltage measurement; binary inputs for block/reset (dry contact) |
| Signal Output Types | Trip and alarm relay outputs (change-over); watchdog/health relay |
| Communication Interfaces | SPA-bus over RS‑485 on RS488003-AA variants (for remote settings and event data) |
| Installation Method | Panel/flush mounting in switchgear cubicles; withdrawable relay case with screw terminals |
You’ll typically see the SPAU341C1-AA in MV substations, generator control panels, industrial plants, and utility auxiliary boards. It’s a practical choice for:
Generator protection schemes needing U/f, df/dt for islanding and load-shedding logic
Feeder and bus-section panels where voltage supervision and alarming are essential
Microgrids or cogeneration sites using VT-based monitoring for grid-coupling
Retrofit projects in SPACOM-based switchgear, where wiring and setting philosophy must remain familiar
Reliability: SPACOM hardware is known for stable measurement and long service life—fewer nuisance trips, less downtime.
Compatibility: Fits existing ABB SPACOM cutouts and wiring conventions; usually minimal redesign for upgrades.
Cost-effective retrofit: Keeps your protection concept and interlocks intact; no need to overhaul the entire panel.
Communication-ready: RS‑485 SPA-bus variants simplify SCADA tie-in without adding external protocol converters in many cases.
Supportable: Clear indications and accessible terminals make testing and maintenance straightforward for field teams.
Mounting environment: Install in a clean, dry switchgear cabinet with adequate ventilation. Maintain clearance for withdrawing the relay and accessing terminals.
Wiring practices: Use shielded VT leads where applicable; route control wiring separately from power cables. Ensure protective earth bonding is solid.
CT/VT references: Verify VT ratios and nominal secondary voltage (commonly 100/√3 or 110/√3 V) before applying settings.
RS‑485 bus: For SPA-bus, maintain correct A/B polarity, use twisted pair, and apply termination and biasing at the line ends as required.
Commissioning: Perform secondary injection for U/f elements, test trip relays and watchdog contact, and record final settings.
Routine maintenance: Annual functional checks and cleaning of terminal areas; review event records; back up settings after any change.
Safety: De-energize control power and isolate VT circuits before service. Follow site LOTO procedures.
CE compliant; manufactured under ISO 9001 quality systems
RoHS alignment for applicable components in this product class
Manufacturer’s warranty: 12 months (365 days)
“We replaced an aging unit in a cement plant feeder panel with the SPAU341C1-AA. It dropped right into the old SPACOM cutout, and the RS‑485 link came up without any quirks. Settings matched our existing scheme—saved us a full day of rework.” — Maintenance Supervisor, industrial customer
If you’re standardizing protection across multiple sites or planning a like-for-like replacement in SPACOM switchgear, this variant typically keeps both engineering effort and outage time low. You might notice that its balance of core protection functions and simple communications hits the sweet spot for many brownfield projects.
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