Description
Product Core Brief
- Model: SPAJ 110 C — ABB earth-fault relay
- Brand: ABB
- Series: ABB SPACOM / legacy distribution protection relays
- Core Function: Selective earth-fault relay for solidly earthed or low-resistance earthed power systems, used as primary or backup protection for feeders, transformers, generators, and motors.
- Product Type: Earth-fault / neutral overcurrent protection relay
- Key Specs: Low-set stage I₀> with definite-time or IDMT characteristic | High-set stage I₀>> with definite-time characteristic | Serial interface for fiber-optic object bus | Continuous self-supervision
- Condition: New Original (New Surplus) / Factory Sealed — when available
Product Introduction
The ABB SPAJ 110 C is a legacy earth-fault relay designed for selective ground-fault protection in solidly earthed or low-resistance earthed distribution networks. It provides two neutral overcurrent stages: a low-set stage that can operate with definite-time or inverse definite minimum time (IDMT) characteristics, and a high-set stage with definite-time operation.
This relay is typically connected to current transformers in a residual current connection or to a core-balance current transformer. When an earth fault is detected, it can trip the circuit breaker, send an alarm, or initiate external auto-reclose functions depending on the configuration.
Because ABB has listed SPAJ 110 C as a not-active product since 2009, verified surplus units are commonly used for maintenance spares, legacy bay support, and like-for-like replacements where the original protection scheme must be preserved.
Key Technical Specifications
- Part Designation: SPAJ 110 C
- Product Type: Earth-fault / neutral overcurrent relay
- Application: Feeders, transformers, generators, motors in solidly earthed or low-resistance earthed systems
- Protection Stages: Low-set I₀> and high-set I₀>> neutral overcurrent stages
- Low-Set Stage: Definite-time or IDMT characteristic
- High-Set Stage: Definite-time characteristic only
- Blocking/Deblocking: Can cooperate with a residual voltage relay for blocking/deblocking operation
- Measurement Input: Residual CT connection or core-balance CT
- Communication: Serial interface for fiber-optic object bus and substation control systems
- Self-Supervision: Continuous hardware and software auto-diagnostics
- Product Family: SPACOM / ABB Distribution Automation system
- Replacement Type: Obsolete / surplus replacement component
- Packaging: ESD-protected, shock-aware industrial packing
- Traceability: Label, revision, and type marking verification required before installation
- Supply Status: New Original / New Surplus inventory, subject to availability
- Warranty: 12 months from shipment
- Lead Time: Dispatch depends on current surplus stock
- Note: Exact settings depend on CT ratio, earth-fault current level, and coordination requirements
Key Selling Points & Differentiators
- Legacy ABB earth-fault relay for SPACOM-based protection bays.
- Two-stage neutral overcurrent protection with configurable definite-time or IDMT operation.
- Supports blocking/deblocking coordination with residual voltage relays.
- Suitable for feeder, transformer, generator, and motor earth-fault protection.
- Factory-sealed surplus reduces handling risk compared with used pulls.
- Useful for plants maintaining legacy distribution substations or industrial power systems.
- Not recommended for new designs unless the existing protection scheme requires it.
Quality Transparency SOP
- Visual inspection: Check housing, front panel, terminals, labels, and SPAJ 110 C marking.
- Type verification: Confirm SPAJ 110 C and suffix such as -AA, -CA, -DA, or -FA against the original relay.
- Terminal verification: Confirm CT input terminals, trip outputs, and communication interface integrity.
- Setting review: Match CT ratio, I₀> / I₀>> pickup, time delay, and blocking logic to the existing scheme.
- Documentation review: Confirm part number, revision, lot/serial traceability, and packing condition.
Technical Risk Avoidance
- ❗ Confirm the exact relay type before ordering. SPAJ 110 C is an earth-fault relay, not a combined overcurrent and earth-fault relay like SPAJ 140 C.
- ❗ Verify the suffix code. SPAJ 110 C is available in variants such as -AA, -CA, -DA, and -FA, which may differ in options or communication configuration.
- ❗ Check CT connection type. The relay can use residual CT connection or core-balance CT, and the installation must match the existing scheme.
- ❗ Do not assume direct interchangeability with modern Relion or RED/REF relays without engineering review.
- ❗ De-energize and follow proper lockout/tagout before removing or installing relay modules.
- ❗ After replacement, earth-fault settings, CT polarity, trip circuits, and blocking logic must be verified by qualified protection engineers.
Buyer’s FAQ
- Is this a genuine ABB part?
It is supplied as an ABB SPAJ 110 C earth-fault relay. Traceability should be confirmed through labeling and packaging before installation. - Is it new or refurbished?
Listed as New Original / New Surplus, factory sealed when available. It is not a repaired or refurbished relay. - What does SPAJ 110 C protect?
It provides selective earth-fault protection for feeders, transformers, generators, and motors in solidly earthed or low-resistance earthed systems. - Is SPAJ 110 C still in production?
No. It has been listed as a not-active product since 2009. - What is the difference between SPAJ 110 C and SPAJ 140 C?
SPAJ 110 C is an earth-fault relay only. SPAJ 140 C is a combined overcurrent and earth-fault relay. - Can it replace a SPAJ 110 C-AA unit?
Yes, but the suffix and option code should be confirmed against the existing relay nameplate and application requirements. - What warranty and lead time apply?
Standard 12-month warranty from shipment. Lead time depends on current surplus inventory and variant availability.
