ABB SPAJ-140-C Combined Overcurrent and Earth-Fault Relay

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Manufacturer: ABB
Product No.: SPAJ140C
Country of origin:Finland
Product Type: Overcurrent Protection Relays
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 3500g
Dimensions: 142 mm x 162 mm x 250 mm
Shipping port: Xiamen
Warranty: 12 months

Description

Processing secondary line currents to secure distribution assets, the ABB SPAJ-140-C (SPAJ140C) operates as a micro-processor based protection relay designed for selective short-circuit and earth-fault detection. This secondary protective device monitors three-phase overcurrent conditions alongside a non-directional residual ground-fault loop to safeguard radial feeders, industrial motors, and power transformers against thermal destruction or phase unbalance. Operating as an autonomous or networked intelligent electronic device (IED) within substation switchgear arrays, the SPAJ 140 C (SPAJ140C) transfers event records and diagnostic metrics via an asynchronous serial link, minimizing power grid down-time through rapid fault isolation.

Features

Three-Phase Current Monitoring: Integrates dual-stage phase overcurrent elements comprising a low-set stage I> and a high-set stage I>> for flexible time-overcurrent grading.
Residual Earth-Fault Assembly: Features an independent sensitive neutral current tracker splitting ground fault isolation into low-set Io> and high-set Io>> definite-time steps.
Configurable Inverse-Time Profiles: Employs four standardized IDMT time-current curve profiles according to IEC 60255 and BS 142 specifications, plus specialized RI and RXIDG curve matching parameters.
Comprehensive Circuit-Breaker Failure Control: Incorporates an internal CBFP timer module that provides a delayed secondary trip sequence if the primary breaker fails to isolate a system fault.
Non-Volatile Event Tracking: Registers the five most recent fault data clusters including phase start states, peak current magnitudes, and specific trip time milestones.
Continuous Auto-Diagnosis Routine: Runs an integrated self-supervision system tracking micro-controller functionality, auxiliary supply voltages, and internal EEPROM memory blocks.

Applications

Main or backup short-circuit and ground protection on radial medium-voltage distribution feeders.
Overload and earth-fault protection for large capacity industrial asynchronous motors and distribution transformers.
Residual current tracking inside isolated-neutral or resistance-earthed electrical substation networks.

Technical Specifications

Technical Parameter Category	Engineered Specification Value
Manufacturer	ABB
Model Designation	SPAJ 140 C (SPAJ140C)
Product ID Base	1MRS 750629-EN
Core Sub-module Included	SPCJ 4D29 (Overcurrent and Earth-Fault Module)
Rated Phase Current Input (In)	1 A or 5 A configurable by hardware terminals
Rated Neutral Current Input (In)	1 A or 5 A configurable by hardware terminals
Rated Frequency (fn)	50 Hz or 60 Hz selectable via setting configurations
Thermal Withstand Capacity (Continuous)	4 A at 1 A input, 20 A at 5 A input
Thermal Withstand Capacity (For 1 s)	100 A at 1 A input, 500 A at 5 A input
Dynamic Current Withstand (Half-wave value)	250 A at 1 A input, 1250 A at 5 A input
Input Burden / Impedance	<100 mOhm (1 A circuits), <20 mOhm (5 A circuits)
Auxiliary Voltage Supply Option 1 (Uaux)	80...265 V AC or DC
Auxiliary Voltage Supply Option 2 (Uaux)	18...80 V DC
Power Consumption (Quiescent / Operational)	~4 W / ~7 W
Phase Overcurrent Low-Set Setting Range (I>)	0.5...2.5 x In (Definite or IDMT)
Phase Overcurrent High-Set Setting Range (I>>)	0.5...40.0 x In or infinity (Definite time)
Earth-Fault Low-Set Setting Range (Io>)	0.1...0.8 x In (Definite or IDMT)
Earth-Fault High-Set Setting Range (Io>>)	0.1...10.0 x In or infinity (Definite time)
Serial Interface Communication Link	Rear panel plastic or glass fiber-optic ring using SPA bus protocol
Dielectric Test Insulation Voltage	2.0 kV, 50 Hz, 1 minute (IEC 60255-5)
Impulse Testing Threshold	5 kV, 1.2/50 us pulse, 0.5 Joules (IEC 60255-5)
Ambient Operational Temperature Limits	-10...+55 Celsius
Enclosure Sealing Rating	IP54 flush panel-mounted format
Product Net Mass	~3.5 kg
Front Bezel Panel Dimensions	142 mm x 162 mm
Enclosure Case Intrusive Depth	250 mm

Connections and Interfaces

Terminal Allocation Index	Circuit Line Function / Signal Mapping
1 - 2	Phase L1 Current Input (5 A configuration mapping)
1 - 3	Phase L1 Current Input (1 A configuration mapping)
4 - 5	Phase L2 Current Input (5 A configuration mapping)
4 - 6	Phase L2 Current Input (1 A configuration mapping)
7 - 8	Phase L3 Current Input (5 A configuration mapping)
7 - 9	Phase L3 Current Input (1 A configuration mapping)
25 - 26	Residual Earth-Fault Current Input Io (5 A mapping configuration)
25 - 27	Residual Earth-Fault Current Input Io (1 A mapping configuration)
10 - 11	External Binary Control Interface (Optically Isolated Input Channel)
61 - 62	Auxiliary System Supply Power Input Contacts (Uaux)
65 - 66	Internal Relay Failure (IRF) Watchdog Output Contact Loop
68 - 69	Main Circuit Breaker Primary Heavy Tripping Output Relay Matrix
70 - 71 - 72	Signalling Output Contact Array (Configurable for Start / Trip alarms)
74 - 75	Secondary Tripping Contact Output Relay Matrix

Empirical Engineering Insights

Alternative Models & Compatibility

The SPAJ 140 C protective assembly incorporates the removable SPCJ 4D29 internal conversion card. It can be slotted into standard size dim100

Key Features:

#Overcurrent Protection Relays #SPAJ Series

Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

What does fault code 30 indicate on the relay display window?

Fault code 30 flags a program memory error, indicating that the internal microcontroller self-supervision check found a ROM checksum failure during startup or active runtime monitoring.

How are the 1 A and 5 A current input steps adjusted during relay installation?

The current parameters are set via terminal selection. Connect current lines to ports 1-3, 4-6, 7-9, and 25-27 for 1 A operation, or ports 1-2, 4-5, 7-8, and 25-26 for 5 A loops.

What is the purpose of the built-in binary input terminal link (terminals 10-11)?

The binary input receives external optical command triggers, typically used to block protective stages remotely or dynamically switch setting groups via external control circuits.

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Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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TECHNICAL SPECIFICATIONS

Color pattern	White Greyish White
Country of origin	Finland

ABB SPAJ-140-C Combined Overcurrent and Earth-Fault Relay