Product Core Brief

• Model: SPCJ4D34-AA
• Brand: ABB
• Series: ABB SPACOM SPA100-series protection module (D-type current protection module)
• Core Function: Three-phase overcurrent protection module used inside ABB SPACOM relay assemblies, typically for motor and feeder protection applications.
• Product Type: Overcurrent protection module (SPACOM module)
• Key Specs: Three-phase current protection | Used in SPAM150C and similar SPACOM relay assemblies | D-type module | Legacy ABB component
• Condition: New Original / New Surplus (verify by full order code and revision)

Key Technical Specifications

• Part Number:
• Product Type: Three-phase overcurrent protection module (SPACOM SPA100 family, D-type module)
• System Role: Provides phase overcurrent protection inside modular SPACOM relay assemblies, typically for motor, feeder, and transformer protection.
• Typical Applications: Motor overload and short-circuit protection, feeder overcurrent protection, thermal overload monitoring, locked-rotor/stall protection coordination.
• Module Type: D-type SPACOM protection module (current protection module family SPCJ 4Dxx)
• Protection Functions: Three-phase overcurrent (I>), high-set instantaneous overcurrent (I>>), thermal overload modeling, start supervision, and related motor/feeder protection functions depending on the host relay assembly.
• Compatibility: Used in ABB SPAM-series relay assemblies such as SPAM150C; the module forms part of a multi-module relay rather than operating as a fully standalone unit.
• Current Inputs: Accepts CT secondary currents consistent with the host relay configuration; rated current and CT ratio depend on the complete relay assembly.
• Auxiliary Supply: Determined by the power supply module in the same relay assembly; SPCJ4D34-AA itself is a protection module, not a power supply unit.
• Indicators/Registers: Front-panel register and LED indicators for current ratio, thermal status, trip/alarm status, and protection stage information, as shown on SPAM150C-type relays.
• Mounting: Modular plug-in module inside SPACOM relay housing; replaced as part of the relay assembly or as a spare module depending on service strategy.
• Lifecycle Status: Legacy SPACOM module; long-term projects should consider migration to ABB Relion 615 series or supported motor/feeder protection relays.

 

Product Introduction (No Fluff)

The ABB SPCJ4D34-AA is a three-phase overcurrent protection module from the SPACOM SPA100 family. It is a D-type current protection module commonly used inside ABB SPAM-series relay assemblies, including the SPAM150C motor protection relay.

Its practical value is maintaining legacy ABB motor and feeder protection installations where a failed overcurrent module can disable phase overcurrent, high-set overcurrent, thermal overlo

 

ad, or start-supervision functions. Because SPCJ4D34-AA is a modular protection component rather than a complete standalone relay in many applications, its exact function depends on the host relay assembly and internal module configuration.

For replacements, the full order code SPCJ4D34-AA, host relay model, firmware/revision, and module position should be verified against the existing unit label.

 

QA & Testing SOP (Dynamic & Transparent)

For legacy SPACOM protection modules, we verify mechanical integrity and basic readiness before shipping.

1. Part number verification — Confirm SPCJ4D34-AA on the module label; check revision, serial number, and host relay model.
2. Visual inspection — Inspect the module housing, front panel, connectors, and PCB edges for corrosion, burn marks, or mechanical damage.
3. Connector and contact check — Verify module plug-in contacts, communication pins, and terminal interfaces for oxidation, bent pins, or contamination.
4. Insulation and short-circuit check — Confirm no short circuits between module contacts, current input circuits, and internal logic circuits before installation.
5. Assembly-level verification — Where test fixtures are available, install the module into the correct SPACOM relay assembly and verify LED indicators, register display, overcurrent stages, and trip output operation.

 

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Confirm the host relay assembly. SPCJ4D34-AA is typically a module inside a SPACOM relay such as SPAM150C. Replacing it without confirming the correct assembly and slot position can cause functional mismatches.

❗ Match the full order code. Variants may differ in revision, firmware, or internal configuration. Substituting without verification may affect protection settings or compatibility.

❗ Record protection settings. Before replacement, document overcurrent pickup values, time delays, thermal model parameters, start supervision settings, and trip/alarm configurations.

❗ Verify CT wiring and polarity. Incorrect CT connections can cause measurement errors, false trips, or failure to detect overcurrent conditions.

❗ Test after installation. Perform secondary injection testing on phase overcurrent, high-set overcurrent, thermal overload, and start supervision functions before returning the motor or feeder to service.

❗ Check module seating and contacts. Ensure the module is fully inserted into the correct slot and that plug-in contacts are clean and properly engaged.

Replacement steps:

1. Record relay settings, module position, CT ratios, wiring, and host relay model.
2. De-energize the relay assembly and verify safe isolation before removing the module.
3. Install the replacement SPCJ4D34-AA in the correct slot and restore all settings.
4. Verify display, LED status, protection stages, and trip outputs using secondary injection testing.

 

Technical FAQ

What BB ? It is a three-phase overcurrent protection module from the ABB SPACOM SPA100 family, commonly used inside SPAM-series relay assemblies such as SPAM150C.

Is a standalone relay? Not typically. It is a protection module that forms part of a modular SPACOM relay assembly. Its full functionality depends on the host relay and accompanying modules.

Which relays use this module? It is associated with ABB SPAM-series motor and feeder protection relays, including SPAM150C-type assemblies.

Can it be replaced individually? It can be replaced as a spare module, but compatibility with the host relay assembly, revision, and protection configuration should be confirmed.

Is it still available? It is a legacy SPACOM module. New surplus and verified replacements can be sourced, but long-term projects should evaluate migration to ABB Relion 615 series or other supported protection platforms.