Product Core Brief
- Model: SPAJ140 (typically SPAJ 140 C)
- Brand: ABB
- Series: ABB SPACOM 100 series legacy protection relay
- Core Function: Combined overcurrent and earth-fault protection for radial feeders in solidly, resistively, or impedance-earthed systems.
- Product Type: ABB Legacy Feeder Protection Relay
- Key Specs: SPAJ 140 C | SPCJ 4D29 module | overcurrent + earth-fault + CBFP | SPA bus
- Condition: New Original / New Surplus (verify per lot)
- Status: Legacy / end-of-life; Relion 615 series is the current replacement family
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | SPAJ140 / 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 bus connection module |
| Outputs | 2 heavy-duty trip relays + 4 signal relays |
| Mounting | Panel-mounted relay |
| Availability | Surplus / OEM replacement stock |
Note: 具体订货号、电源模块版本、CT 额定电流、通信配置需以铭牌为准。不要把它描述为支持 IEC 61850、GOOSE、MMS 或以太网通信；SPAJ140 本身是 SPA 总线/串行口设备。
Product Introduction (No Fluff)
The ABB SPAJ140, most commonly found as SPAJ 140 C, is a legacy SPACOM 100 series combined overcurrent and earth-fault protection relay. It is used for selective short-circuit and ground-fault protection on radial feeders in solidly, resistively, or impedance-earthed power systems.
The relay integrates a three-phase low-set overcurrent unit, a high-set overcurrent unit, a low-set earth-fault unit, and a high-set earth-fault unit, with definite-time or IDMT characteristics depending on configuration. It also includes built-in breaker failure protection and a programmable output relay matrix.
Its main value today is as a verified replacement for existing SPACOM installations. Because the product line is legacy, new projects should consider Relion 615 series relays as the current ABB replacement path.
QA & Testing SOP (Dynamic & Transparent)
- Nameplate verification: Confirm SPAJ 140 C, SPCJ module type, auxiliary voltage range, CT secondary current, and serial number.
- Power module check: Identify whether it uses SPTU 240 R1 (ac/dc) or SPTU 48 R1 (dc only).
- Display & keys test: Verify the front-panel display, STEP/RESET/PROGRAM buttons, and LED indicators.
- Protection test: Inject phase current and residual current to verify I>, I>>, I0>, I0>> pickup and timing.
- Output & communication test: Check trip/signal relay operation and SPA bus or serial communication if connected.
Installation Pitfalls & Guide (Engineer to Engineer)
❗ Not a PLC or Ethernet relay. SPAJ140 is a feeder protection relay with SPA bus/serial communication, not an IEC 61850 device.
❗ Auxiliary voltage must match. Some units accept 80–265 V ac/dc, while others are 18–80 V dc only.
❗ CT secondary must be confirmed. The relay may be configured for 1 A or 5 A; wrong CT matching causes measurement and protection errors.
❗ SPA bus wiring is specific. If connected to a fiber-optic SPA bus, the correct SPA-ZC bus connection module must be used.
Replacement steps:
- Record CT wiring, auxiliary supply, output relay assignments, and setting values.
- De-energize CT secondaries and auxiliary supply before removal.
- Replace the relay and restore wiring according to the original diagram.
- Reapply settings and verify trip logic, signal outputs, and communication.
- Perform secondary injection testing before returning the feeder to service.
Technical FAQ
1. Is SPAJ140 still produced by ABB?
No. It is a legacy SPACOM product. ABB lists Relion 615 series as the replacement family.
2. What does SPAJ140 protect?
It provides overcurrent and earth-fault protection for radial feeders, and can also be used for transformer or equipment backup protection.
3. Is SPAJ140 the same as SPAJ 140 C?
SPAJ140 is the family name. SPAJ 140 C is the most common version, but other variants exist. Always confirm the exact type on the nameplate.
4. Can it communicate via Ethernet or IEC 61850?
Not natively. SPAJ140 uses a serial port and can connect to the SPA bus through SPA-ZC modules.
5. What should I check before buying surplus stock?
Confirm the exact model, auxiliary voltage, CT rating, module version, display condition, and whether the unit has been tested with secondary injection.
