Description
Technical Parameters ABB SPAJ140
| Parameter Item | Parameter Value |
|---|---|
| Device Type | Low/medium-voltage overcurrent & earth fault protection relay |
| Rated Voltage | 230V/400V AC (LV), 6kV/10kV/35kV AC (MV with CT/PT) |
| Rated Current | 1A/5A (CT secondary side input) |
| Overcurrent Protection Setting Range | 0.2-10× rated current |
| Earth Fault Protection Setting Range | 0.1-5× rated current |
| Time-Delay Characteristics | Inverse definite minimum time (IDMT), definite time |
| Tripping Time | ≤100ms (definite time mode, 5× setting current) |
| Operating Power Supply | 110/220V AC/DC ±15% |
| Protection Level | IP20 (cabinet mounting) |
| Relay Output | 2× NO/NC configurable contacts (250V AC/5A) |
| Compatible Devices | ABB SACE series circuit breakers, ABB switchgear |
Product Advantages and Features ABB SPAJ140
- Dual protection functions, one-device solution
ABB SPAJ140 integrates overcurrent and earth fault protection in a single module, eliminating the need for separate protection devices for each fault type. This reduces the number of components in the distribution cabinet, simplifies wiring, and lowers the overall system cost by 30% compared to using two independent relays.
- Flexible time-delay characteristics, selective protection
The relay supports both IDMT and definite time-delay characteristics, which can be flexibly set according to the distribution network topology. This enables selective tripping—only the faulty branch circuit is disconnected, while the upstream power supply and other normal branches remain operational, minimizing the impact of faults on the entire power system.
- Strong environmental adaptability, stable operation in harsh conditions
ABB SPAJ140 is designed with anti-electromagnetic interference and wide-temperature adaptation capabilities, operating stably in the temperature range of -25℃~+60℃. It can resist electromagnetic interference from industrial equipment such as motors and inverters, ensuring reliable protection action even in complex industrial environments, with a mean time between failures (MTBF) of over 50,000 hours.
- Simple parameter configuration, easy on-site debugging
The relay features intuitive rotary knobs and toggle switches for parameter setting, without the need for complex software or professional tools. This allows on-site maintenance personnel to quickly adjust protection thresholds and time delays according to system changes, significantly shortening debugging time and reducing operation and maintenance costs.
Application Cases ABB SPAJ140
- Industrial workshop feeder circuit protection
In a heavy machinery manufacturing workshop, ABB SPAJ140 is installed on each feeder circuit supplying power to machine tools. It provides overcurrent protection against motor startup overload and earth fault protection against insulation damage. The selective tripping function ensures that a fault in one machine tool does not affect the power supply of other equipment, reducing production downtime by 25%.
- Commercial building distribution network protection
In a high-rise commercial building’s 10kV distribution system, the relay is configured for each transformer secondary feeder line. It monitors the current of lighting, air conditioning, and power socket circuits, and trips quickly when an earth fault occurs, preventing electrical fire hazards. The simple parameter configuration also facilitates quick adjustments during building renovation and load expansion.
- Agricultural irrigation pump motor protection
In a large-scale agricultural irrigation project, ABB SPAJ140 protects the submersible pump motors in the irrigation system. It withstands the humid and dusty outdoor environment, and the overcurrent protection function prevents motor burnout caused by overload during pump startup. The earth fault protection function also ensures the safety of maintenance personnel during on-site operations.
Competitor Comparison
| Feature | ABB SPAJ140 | Siemens 7SJ60 | Schneider Sepam 20 |
|---|---|---|---|
| Protection Functions | Overcurrent + earth fault | Overcurrent + earth fault | Overcurrent only |
| Time-Delay Characteristics | IDMT + definite time | IDMT + definite time | Definite time only |
| Operating Temperature | -25℃~+60℃ | -20℃~+55℃ | -10℃~+50℃ |
| Parameter Setting Method | Rotary knobs + switches | Software + switches | Software only |
| Cost-Effectiveness | High | Medium | Medium |
Selection Suggestions
- For low/medium-voltage feeder circuits, industrial motor branches, and commercial building distribution systems, ABB SPAJ140 is preferred due to its dual protection functions and flexible time-delay settings.
- If the project requires simple on-site parameter adjustment without professional software, the relay’s knob-and-switch configuration method is more convenient than software-based competitors.
- For outdoor or harsh industrial environments with high humidity and electromagnetic interference, the relay’s strong environmental adaptability has obvious advantages over similar products.
Precautions
- During installation, ensure the correct connection of the CT secondary side, and avoid polarity reversal, which may cause protection misoperation or failure to trip.
- When setting protection parameters, determine the overcurrent and earth fault thresholds according to the actual load current and system short-circuit current, avoiding overly sensitive settings that cause frequent tripping.
- Regularly check the connection tightness of the relay terminals to prevent poor contact caused by vibration or dust accumulation, which may affect the normal operation of the device.
- During maintenance, cut off the operating power supply first, and do not disassemble the relay casing at will to avoid damaging the internal circuit components.
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