Product Core Brief
- Model: SPAJ140C (typically SPAJ 140 C)
- Relay Module: SPCJ 4D29
- Brand: ABB
- Series: ABB SPACOM 100 series legacy protection relay
- Core Function: Combined phase overcurrent and non-directional earth-fault protection for radial feeders, with breaker failure protection.
- Product Type: ABB Legacy Feeder Protection Relay
- Key Specs: SPAJ 140 C | SPCJ 4D29 | I>/I>> + I0>/I0>> | CBFP | SPA bus
- Condition: New Original / New Surplus (verify per lot)
- Status: Legacy; ABB recommends Relion 615 series as the replacement path.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | SPAJ140C / SPAJ 140 C |
| Relay Module | SPCJ 4D29 combined overcurrent & earth-fault module |
| Protection Functions | Phase overcurrent I>/I>>, earth-fault I0>/I0>>, breaker failure protection |
| CT Secondary | 1 A or 5 A (confirm on nameplate) |
| Auxiliary Supply | 80–265 V ac/dc or 18–80 V dc depending on power module |
| Communication | Serial port; SPA bus via SPA-ZC module |
| Outputs | 2 heavy-duty trip relays + 4 signal relays |
| Mounting | Panel-mounted relay |
| Availability | Surplus / OEM replacement stock |
Note: 具体电源模块、CT 额定值、通信版本需以铭牌为准。
Product Introduction
The ABB SPAJ140C is a legacy SPACOM 100 series combined overcurrent and earth-fault protection relay. It is designed for selective short-circuit and ground-fault protection on radial feeders in solidly, resistively, or impedance-earthed networks.
The relay integrates low-set and high-set phase overcurrent units, low-set and high-set earth-fault units, and built-in breaker failure protection. It provides two heavy-duty trip outputs and four signal outputs, with local display for settings, measurements, and fault records.
Today, SPAJ140C is mainly used as a verified replacement in existing SPACOM installations. For new projects or full retrofits, ABB recommends Relion 615 series relays.
QA & Testing SOP
- Nameplate verification: Confirm SPAJ 140 C, SPCJ 4D29, auxiliary voltage, CT rating, and serial number.
- Power module check: Identify whether the unit uses an 80–265 V ac/dc or 18–80 V dc power module.
- Display & keys test: Verify display, STEP/PROGRAM buttons, LEDs, and self-test alarm.
- Protection test: Inject phase and residual currents to verify I>, I>>, I0>, I0>> pickup and timing.
- Output & communication test: Check trip/signal relay operation and SPA bus or serial communication.
Installation Pitfalls
❗ Not a PLC or Ethernet relay. SPAJ140C uses SPA bus/serial communication, not native IEC 61850 or Ethernet.
❗ Auxiliary voltage must match. Some versions are 80–265 V ac/dc; others are 18–80 V dc only.
❗ CT secondary must be confirmed. 1 A and 5 A versions are not interchangeable without verification.
❗ SPA bus wiring is specific. Fiber-optic SPA bus requires the correct SPA-ZC connection module.
Replacement steps:
- Record CT wiring, auxiliary supply, output assignments, and settings.
- De-energize CT secondaries and auxiliary supply.
- Replace the relay and restore wiring.
- Reapply settings and verify trip logic.
- Perform secondary injection testing before returning the feeder to service.
Technical FAQ
1. Is SPAJ140C still produced?
No. It is a legacy SPACOM product. ABB recommends Relion 615 series as the replacement.
2. What does it protect?
Radial feeders, transformers, and equipment requiring combined overcurrent and earth-fault protection.
3. Is SPAJ140C the same as SPAJ140?
SPAJ140 is the family name. SPAJ140C is the most common version, but always confirm the exact type on the nameplate.
4. Does it support IEC 61850 or Ethernet?
Not natively. It communicates via serial port and SPA bus.
5. What should I check before buying?
Confirm the exact model, auxiliary voltage, CT rating, module version, display condition, and whether it has been tested.
