SPAU 140 ABB Power System Protection Unit
Description
SPAU 140 ABB Power System Protection Unit is a multi-functional voltage protection relay designed specifically for three-phase AC systems, part of ABB’s SPA series of classic protection relays.
| Specification | Value |
|---|---|
| Product Type | Multi-functional voltage protection relay |
| Auxiliary Power Options | 240VAC ±15%, 120VAC (North American version), 24VDC |
| Voltage Input | 100V or 110V phase voltage, selectable via dip switch |
| Overvoltage Setting Range | 110% – 130% of rated voltage |
| Undervoltage Setting Range | 50% – 80% of rated voltage |
| Time Delay Range | 0.1s – 30s, adjustable |
| Communication Interface | Profibus DP, 12 MBit/s |
| Protection Rating | Front panel IP40, IP20 when installed in switchgear |
| Operating Temperature | -25 to 55 degrees Celsius |
| Certifications | IEC 60255, CE, UL |
Key Features:
- Four integrated voltage protection functions: overvoltage, undervoltage, phase loss, and phase sequence error protection
- High integration with compact design, saving switchgear space and simplifying secondary wiring
- Wide range of adjustable settings for voltage thresholds and time delays to match different load requirements
- Strong anti-interference capability with isolated, regulated power supply and surge suppression
- Built-in data recording, diagnostic functions, and self-diagnosis system for reliable operation
Applications:
- Generator protection to prevent over-excitation damage to windings
- Motor protection against overheating from low voltage or phase reversal mechanical damage
- Transformer protection to monitor low-side voltage and prevent abnormal operation
- Critical feeder circuit protection in chemical, mining, and data center backup power systems
Related Models:
- SPAJ140 (SPACOM series overcurrent and ground fault protection relay)
- SPAU140C (SPA series voltage protection relay variant)
- SPTU240R4 (dedicated power module for SPAU 140)