ABB SPAD346C3 differential relay

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ABB SPAD346C3 Differential Relay – Product Information

1. Product Overview

The ABB SPAD346C3 is a high-performance differential relay designed for protection of transformers, generators, busbars, and motors.
It detects the difference between incoming and outgoing currents to quickly identify internal faults, ensuring equipment safety and minimizing system damage.
SPAD346C3 supports multiple configurations and communication interfaces, enabling integration with smart grids and automation systems for remote monitoring and management.

2. Technical Specifications

• Model: SPAD346C3

• Type: Differential Relay

• Applicable Equipment: Transformers, generators, busbars, motors

• Protection Type: Current differential protection, restricted current protection

• Trip Time: ≤ 20 ms

• Rated Current: 5 A (primary), 1 A (CT secondary)

• Power Supply: 110–230 V AC/DC

• Communication Interfaces: Modbus RTU, IEC 61850 (optional)

• Operating Temperature: -20 ℃ to +60 ℃

• Storage Temperature: -40 ℃ to +85 ℃

• Humidity: 5% to 95%, non-condensing

• Protection Class: IP20

• Mounting: Panel or DIN rail

• Dimensions: Approx. 144 × 144 × 120 mm

• Weight: Approx. 1.6 kg

• Certifications: CE, UL, RoHS, IEC 60255

3. Features and Advantages

1. Fast differential protection – Quickly detects internal faults, minimizing equipment damage.

2. High-precision measurement – Accurate detection of current differences for reliable relay operation.

3. Integrated multifunctionality – Supports differential protection, restricted current protection, and various logic configurations.

4. Intelligent communication – Optional IEC 61850 or Modbus RTU for smart grid integration.

5. Industrial-grade reliability – Designed for stable long-term operation in industrial environments.

6. Flexible installation – Panel or DIN rail mount for easy system integration.

4. Application Areas

• Transformer protection

• Generator differential protection

• Busbar protection and distribution systems

• Motor and large industrial equipment protection

• Smart grid and distribution automation systems

• Industrial power monitoring systems

5. Precautions

1. Installation and wiring must be performed by qualified electrical engineers.

2. Disconnect power before wiring to prevent electric shock or relay damage.

3. Do not exceed rated voltage, current, or environmental temperature limits.

4. Regularly check terminals and connections for reliable contact.

5. Use protective measures in high humidity, dusty, or corrosive environments.

6. Maintenance, commissioning, and parameter configuration should follow ABB official manuals.

The structure and details of the product：

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