ABB SPAJ 140 C-AA | SPACOM Protection Relay | 80–265 VAC/DC Supply

Description

ABB SPAJ 140 C-AA

Key Technical Specifications

The SPAJ 140 C is a combined protection relay rather than a general-purpose auxiliary relay. The -AA suffix is significant: ABB’s ordering information distinguishes it from -CA, -DA, and -FA versions, which use different auxiliary-voltage/frequency configurations.

Product Introduction

The ABB SPAJ 140 C-AA is a SPACOM-series combined overcurrent and earth-fault protection relay designed for medium-voltage distribution applications. Its protection role is to detect abnormal phase current and earth-fault conditions and provide the associated trip and alarm functions to the switchgear control circuit. The corresponding ABB order number is RS 611 006-AA.

For maintenance teams, the auxiliary supply is one of the first identification points to verify. The -AA configuration is specified for 80–265 V AC/DC at 50 Hz, so it should not be casually substituted with another SPAJ 140 C suffix. The relay module is also identified as SPCJ 4D29, which can be useful when cross-checking the installed assembly and spare-part documentation.

SPAJ140C-AA

Engineering Pain Point

The common mistake with an older SPAJ 140 C installation is treating every unit marked SPAJ 140 C as electrically interchangeable. They are not necessarily equivalent. The auxiliary-supply suffix, relay module identification, CT circuit, protection settings, trip logic, and existing switchgear wiring all need to agree before a replacement is commissioned.

Typical Applications

• Medium-voltage switchgear feeder protection
• Industrial distribution substations
• Overcurrent backup protection for transformers and motors
• Earth-fault protection in MV distribution systems
• Legacy SPACOM protection panels requiring like-for-like maintenance spares

Technical Pitfalls to Avoid

1. Verify the -AA suffix. ABB lists SPAJ 140 C-AA as 50 Hz, 80–265 V AC/DC. The -CA, -DA, and -FA variants have different auxiliary supply/frequency combinations.
2. Check the CT secondary circuit before energizing. Protection-relay replacement should include verification of CT ratio, polarity, phase assignment, and earth-fault measurement arrangement. Do not assume the existing wiring is correct simply because the old relay operated normally.
3. Record the existing protection settings. Pickup values, time characteristics, stage settings, and trip logic should be documented before removing the original unit. A physically compatible relay with incorrect settings can produce a protection-system problem rather than solve one.
4. Confirm the relay module identification. Listings associate SPAJ 140 C-AA with SPCJ 4D29. Use the installed nameplate and relay markings to confirm the exact assembly rather than relying solely on the external SPAJ designation.
5. Treat modern replacements as engineering changes. If the legacy SPACOM relay is being replaced by a newer protection IED, compare CT inputs, binary I/O, trip-circuit supervision, communication requirements, protection algorithms, panel cutout, and commissioning procedures. Do not assume a newer relay is a drop-in substitute.

Related Products

• ABB SPAJ 140 C-CA — Same SPAJ 140 C protection family, but the ordering information specifies an 18–80 V DC auxiliary supply rather than the 80–265 V AC/DC supply of the -AA version.
• ABB SPAJ 140 C-DA — SPAJ 140 C variant for 60 Hz systems with 80–265 V AC/DC auxiliary supply.
• ABB SPAJ 140 C-FA — SPAJ 140 C variant for 60 Hz systems with 18–80 V DC auxiliary supply.
• ABB SPAJ 160 C-AA — SPACOM capacitor protection relay with the same 50 Hz / 80–265 V AC/DC supply class, but a different protection application.
• ABB SPAM 150 C-AA — SPACOM motor protection relay with functions including overcurrent, earth fault, thermal overload, phase reversal/unbalance, and motor startup supervision.
• ABB SPAF 140 C-AA — SPACOM frequency protection relay; it addresses a different protection function from the SPAJ 140 C overcurrent/earth-fault relay.
• ABB SPAU 341 C1 — SPACOM synchronism-check relay used for a different protection/control purpose.

Procurement note: For SPAJ 140 C-AA, specify the complete identifier RS 611 006-AA when possible and verify the installed SPCJ 4D29 relay module, auxiliary supply, frequency, CT arrangement, and protection settings before approving a replacement. The external SPAJ designation alone is not sufficient for a controlled protection-relay replacement.