ABB SPAJ140C Protection Relay

ABB SPAJ140C — Stop the Clock on Your Downtime. Ship Today.

Every minute a feeder is offline costs money. When your protection relay trips and won’t reset, or when a failed SPAJ140C is holding up an entire MV switchgear panel, you don’t need a sales pitch — you need the part on a plane tonight. We stock the ABB SPAJ140C in Xiamen and can have it moving via DHL Express within hours of order confirmation. No waiting on factory lead times. No distributor runaround.

The SPAJ140C is a combined over-current and earth-fault protection relay from ABB’s REJ/SPAJ series, purpose-built for feeder and motor protection in medium-voltage distribution networks. It handles three-phase over-current (I>, I>>) and earth-fault (Io>, Io>>) in a single flush-mount unit — the kind of dual-function design that makes it irreplaceable in legacy switchgear where panel space is fixed and rewiring is not an option. When this relay goes down, there is no easy substitute. You need the exact model, and you need it fast.

URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

The SPAJ140C fails in predictable ways. Here’s what field experience tells you to check before you pull the unit and before you commission the replacement:

Common Fault Signatures:

• Relay trips on energization with no fault present — Almost always a CT polarity reversal or a residual current path through the earth-fault input. Verify CT wiring polarity (S1/S2 terminals) and confirm the Io input is not picking up transformer inrush as a fault. Check the Io> pickup setting — if it’s set too sensitive (<0.1 × In) and the CT has remanence, you’ll get nuisance trips every time.
• Relay fails to trip on a known fault — Check the auxiliary supply voltage at the relay terminals under load. A sagging DC bus (battery charger failure) can cause the relay to lose its output relay coil drive mid-fault. Also verify the trip output contact wiring — SPAJ140C uses normally-open output contacts; confirm the circuit breaker trip coil circuit is complete.
• SPA-bus communication lost after replacement — The SPAJ140C requires a unique SPA address set via the front-panel keypad (not DIP switches). If you’re replacing a unit, retrieve the old address from your SCADA configuration before decommissioning. Default address is 1; duplicate addresses on the same bus will cause both units to drop off.
• IDMT curve mismatch after swap — The time multiplier setting (TMS) and curve type (Normal Inverse, Very Inverse, Extremely Inverse) are stored in the relay’s non-volatile memory. A new unit ships with factory defaults. Pull the protection coordination study or the old relay’s setting sheet before commissioning — do not assume the settings are correct.

Replacement Checklist:

• Record all existing settings (I>, I>>, Io>, Io>>, TMS, curve type, SPA address) before removing the old unit.
• Verify auxiliary voltage matches the relay’s rated range (24–240 V AC/DC — confirm your panel’s DC bus voltage).
• Check CT secondary rating (1 A or 5 A) — the SPAJ140C input must match your installed CTs. Connecting a 1 A relay to 5 A CTs will saturate the input and give erratic readings.
• After wiring, perform a secondary injection test on all protection elements before closing the feeder.
• Confirm SPA-bus address and baud rate match the SCADA master configuration.
• Test all output contacts (trip, alarm, indication) with a continuity check before energizing.

Reliability in Harsh Conditions

The SPAJ140C was not designed for a climate-controlled server room. ABB engineered this relay for the realities of industrial switchgear — outdoor substations in tropical humidity, mining environments with constant vibration, and steel plant switchrooms where ambient temperatures regularly exceed 50°C.

The unit’s sealed housing resists ingress of dust and moisture, and the wide-range auxiliary input (24–240 V AC/DC) means it keeps operating even when the station battery is degraded and the bus voltage is sagging. The True RMS measuring principle ensures the relay doesn’t misoperate in environments with significant harmonic distortion — a common problem in plants with large VFD loads or arc furnaces where cheaper relays give false trips.

Vibration tolerance is built into the mechanical design of the output relays and the PCB mounting. Units that have been in service for 15–20 years in oil & gas facilities and water treatment plants are still operating within specification — a testament to the build quality that makes sourcing a genuine replacement unit the only acceptable option when one finally fails.

Every unit we ship has been physically inspected: housing integrity, label authenticity, terminal condition, and serial number traceability are verified before the box is sealed. We do not ship units with damaged housings, corroded terminals, or missing documentation.

Global Express Logistics

Our warehouse is in Xiamen, China — one of the country’s primary export hubs with direct access to DHL, FedEx, and UPS international gateways. When you confirm an order before 15:00 CST, the unit ships the same day.

• DHL Express Worldwide: 1–3 business days to most of Europe, Middle East, and Southeast Asia. 2–4 days to North America and Australia.
• FedEx International Priority: Comparable transit times with strong coverage in the Americas and India.
• UPS Express: Available on request for destinations with preferred UPS routing.
• Documentation included: Commercial invoice, packing list, certificate of origin, and HS code declaration (HS 8536.49 for protection relays) — everything your customs broker needs to clear the shipment without delays.
• Tracking: Waybill number sent via email and WhatsApp within 2 hours of dispatch. You know exactly where your part is at all times.
• Emergency freight: For critical shutdowns, we can arrange next-flight-out courier on request. Contact us directly on WhatsApp for same-day freight options.

We have shipped to utilities, EPC contractors, and plant maintenance teams across 60+ countries. If your procurement team needs a formal quotation with lead time confirmation, we turn those around in under 2 hours during business hours.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
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