Description
Product Core Brief
- Model: SPAJ140C
- Brand: ABB
- Series: ABB SPACOM protection relay family
- Core Function: Combined overcurrent and earth-fault protection relay for radial feeders in solidly-earthed, resistance-earthed, or impedance-earthed networks.
- Product Type: Feeder protection relay
- Key Specs: Three-phase overcurrent | Earth-fault protection | Circuit-breaker failure protection | IDMT and definite-time characteristics | Two trip and four signal outputs
- Condition: New Original (New Surplus) / Factory Sealed
Product Introduction
When a feeder protection relay fails or a spare unit is needed for planned maintenance, the distribution network loses its primary selective protection against short-circuit and earth-fault events. The ABB SPAJ140C is a combined overcurrent and earth-fault relay designed for radial feeders in industrial, utility, and process power distribution systems. It integrates phase overcurrent protection, earth-fault protection, and circuit-breaker failure protection in a single relay unit.
This relay is no longer an active ABB product, having been discontinued since 2016, so it is typically sourced as a replacement for legacy installations, retrofit projects, or critical spare stocking. Before ordering, confirm the exact sub-model on the nameplate, since SPAJ140C, SPAJ141C, and SPAJ142C differ in measurement module configuration and application scope.
Key Technical Specifications
- Part Designation:
- Brand: ABB
- Application: Radial feeder protection in solidly-earthed, resistance-earthed, or impedance-earthed power systems
- Module Type: Combined overcurrent and earth-fault protection relay
- Overcurrent Protection: Three-phase low-set overcurrent with definite-time or IDMT characteristics; three-phase high-set overcurrent with instantaneous or definite-time characteristics
- Earth-Fault Protection: Low-set earth-fault with definite-time or IDMT characteristics; high-set earth-fault with instantaneous or definite-time characteristics
- Circuit-Breaker Failure Protection: Built-in CBFP logic for backup tripping
- CT Rated Current: 1A or 5A, depending on configuration
- Rated Frequency: 50 Hz or 60 Hz
- Auxiliary Voltage: 80…265 V ac/dc or 18…80 V dc, depending on power supply module
- Output Relays: Two heavy-duty trip relays and four signal relays with programmable output matrix
- Communication: Serial interface / SPA bus for local or remote setting access
- Enclosure Rating: IP54 for embedded relay housing
- Product Status: Not active product since 2016
- Condition: New Original (New Surplus) / Factory Sealed
- Note: Exact hardware revision, power supply module, and communication options should be verified against the nameplate and ABB documentation.
Key Selling Points & Differentiators
- Exact legacy replacement: Supplied as SPAJ140C to support like-for-like replacement in existing feeder protection bays.
- Integrated protection functions: Combines overcurrent, earth-fault, and circuit-breaker failure protection in one relay.
- Flexible time-current characteristics: Supports definite-time and IDMT curves for selective feeder coordination.
- Programmable output matrix: Two trip and four signal outputs can be assigned to different protection stages.
- Factory-sealed supply: Shipped with ESD-safe handling and visual QA before dispatch.
- Not recommended for new greenfield projects where modern ABB Relion 615/620/630 series relays are specified, or for applications requiring active OEM support and current firmware updates.
Quality Transparency SOP
- Visual inspection: Check front panel, display, connectors, mounting hardware, and labeling for damage or corrosion.
- ESD-safe handling: Packed in anti-static protection to prevent damage to internal electronics.
- Connector verification: Inspect CT inputs, binary I/O terminals, communication ports, and power supply terminals.
- Nameplate cross-check: Confirm SPAJ140C designation, auxiliary voltage range, and hardware revision before shipment.
- Functional validation: When compatible test equipment is available, verify power-up response, protection element pickup, LED/status indication, and I/O operation. Full validation depends on the host feeder protection scheme and CT configuration.
Technical Risk Avoidance
❗ Confirm the exact sub-model. SPAJ140C, SPAJ141C, and SPAJ142C are not automatically interchangeable without verifying module configuration and application requirements.
❗ Verify auxiliary voltage. The relay may use 80…265 V ac/dc or 18…80 V dc depending on the installed power supply module.
❗ Check CT secondary current. Confirm whether the existing installation uses 1A or 5A CTs before replacement.
❗ Review protection settings. Replacement relays should be tested with secondary injection and verified against the existing coordination study before being placed into service.
❗ Confirm product lifecycle status. SPAJ140C is a legacy product; long-term support, firmware updates, and spare availability should be evaluated for critical installations.
Buyer’s FAQ
Is this an original ABB part?
Yes. The listing is for ABB SPAJ140C as a new original/new surplus, factory-sealed unit. We do not relabel third-party substitutes.
Which application does SPAJ140C fit?
It is designed for radial feeder protection in solidly-earthed, resistance-earthed, or impedance-earthed power systems, with combined overcurrent and earth-fault protection.
Can replace SPAJ141C or SPAJ142C?
Not automatically. They belong to the same relay family but may differ in measurement module configuration and application scope. Confirm the existing nameplate and protection scheme before substitution.
What condition is the unit?
New Original (New Surplus) / Factory Sealed, unless otherwise stated in the product listing. Photos and batch details can be confirmed before dispatch.
Do you offer a warranty?
Yes. A standard warranty applies from receipt. Exact terms depend on stock batch and installation conditions. Installation and testing should be performed by qualified protection and control engineers.
