Description

ABB SPAU 330 C1-AA Combined Overcurrent and Earth-Fault Protection Relay

Configured for selective phase overcurrent and earth-fault protection in radial distribution networks, the ABB SPAU 330 C1-AA (SPAU 330 combined protection relay) processes current inputs and executes defined protection stages. It supports local indication, parameter setting, trip signaling, and SPA bus communication.

Hardware Specifications

Parameter	Specification
Model	SPAU 330 C1-AA
Brand	ABB
Product Family	SPACOM
Device Type	Combined Overcurrent and Earth-Fault Protection Relay
Rated Phase Current	1 A or 5 A, selected through terminal connections
Rated Residual Current	1 A or 5 A
Low-Set Overcurrent	3I> stage with definite-time or inverse-time characteristics
High-Set Overcurrent	3I>> stage with definite-time characteristics
Low-Set Earth-Fault	I0> stage with definite-time or inverse-time characteristics
High-Set Earth-Fault	I0>> stage with definite-time characteristics
Local Display	Digital display for measured fault values, settings, and status codes
Status Indication	LEDs for Start, Trip, and high-set operation
Local Controls	Front-panel push buttons for parameter setting and indication reset
Communication	SPA bus serial communication
Output Contacts	Multiple configurable trip and signaling relay contacts
Mounting	Flush mounting with draw-out modular construction
Auxiliary Supply	Wide-range AC/DC variants are available within the SPACOM product range; exact supply rating for this suffix is not specified

ABB Industrial Protection and Control Characteristics

The relay processes phase and residual current signals through dedicated protection stages. Consequently, the low-set stages can apply definite-time or inverse-time operating characteristics, while the high-set stages use definite-time operation.

The front-panel interface provides local access to protection settings, measured fault values, and status information. In addition, the SPA bus interface supports serial communication with substation automation or SCADA equipment.

The draw-out construction separates the relay module from the fixed installation interface during service activities. Therefore, technicians can remove the relay for inspection or testing while maintaining the installed wiring arrangement.

For ABB control-system integration, the relay uses serial SPA bus communication rather than a Profinet or EtherNet/IP interface. The supplied data does not specify a backplane bus, firmware version, or network communication velocity for this model.

Frequently Asked Questions

Q: Which current ratings does the SPAU 330 C1-AA accept?
A: The supplied data specifies 1 A or 5 A rated phase current and 1 A or 5 A rated residual current, selected through terminal connections.

Q: What protection stages are available?
A: The relay provides low-set and high-set phase overcurrent stages, plus low-set and high-set earth-fault stages.

Q: Does the relay support serial communication?
A: Yes. The supplied data identifies an SPA bus serial communication interface for substation automation and SCADA integration.

Field Installation Guidelines

1. Verify the relay model and terminal configuration against the approved protection scheme before installation.
2. Confirm the selected 1 A or 5 A current-input configuration before connecting current transformer secondary circuits.
3. Maintain correct CT polarity and phase identification throughout the current-input wiring.
4. Connect earth-fault current measurement according to the protection-system wiring diagram.
5. Keep current-transformer wiring separated from high-level switching and power conductors where practical.
6. Use appropriate shield termination and grounding practices according to the substation wiring standard.
7. Verify auxiliary supply voltage and polarity against the exact relay nameplate before energization.
8. Check trip and signaling contacts with the associated breaker-control circuit isolated or placed in the approved test condition.
9. Verify protection settings before returning the relay to service.
10. Confirm SPA bus wiring, addressing, and communication parameters before connecting the relay to the supervisory system.
11. Use the draw-out mechanism according to the equipment procedure and avoid withdrawing the module while unsafe electrical conditions exist.
12. Perform functional protection tests after installation and document the final settings and test results.

Specifications

• Brand: ABB

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems