ABB SPAD346C1 Differential Relay

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Product Overview

The ABB SPAD346C1 is an industrial-grade digital differential relay designed for power system protection, especially for transformers, generators, busbars, and motors. The relay compares incoming and outgoing currents to detect differential currents, quickly and accurately isolating faults to ensure safe equipment operation. Its modular design and intuitive interface simplify installation, configuration, and maintenance.

Technical Specifications (Typical)

• Model: SPAD346C1

• Type: Digital Differential Relay

• Function: Differential protection, overcurrent protection, alarm functions

• Rated Current: 5 A / 1 A (secondary of CT)

• Voltage Rating: Suitable for 6 kV～36 kV power systems

• Operating Frequency: 50/60 Hz

• Response Time: ≤ 30 ms

• Interface: Digital inputs/outputs, relay outputs

• Communication: Optional Modbus or IEC 61850

• Operating Temperature: –25℃ to +70℃

• Storage Temperature: –40℃ to +85℃

• Relative Humidity: 5% to 95%, non-condensing

• Protection Degree: IP20

• Mounting: Panel or rack mounting

• Dimensions: approx. 144 × 144 × 180 mm

• Weight: approx. 1.2 kg

• Certification: CE, compliant with IEC 60255 series standards

Advantages & Key Features

1. High-precision differential protection: Quickly and accurately detects current differences to isolate faults.

2. Multi-function protection: Supports differential, overcurrent, and alarm functions for enhanced system safety.

3. Digital interface: Intuitive display and configuration for easy operation and maintenance.

4. Modular design: Facilitates installation and system expansion.

5. Industrial-grade reliability: Resistant to high temperature, humidity, and EMI.

6. Communication capability: Optional IEC 61850 or Modbus interface for remote monitoring and control.

Application Areas

• Transformer differential protection

• Generator and motor differential protection

• Busbar protection and distribution system protection

• High and medium voltage power system automation

• Power system maintenance and equipment upgrades

Precautions

1. Ensure relay rated current, voltage, and protection range match the equipment before installation.

2. Install or maintain only with power off.

3. Avoid high temperature, high humidity, or strong EMI environments.

4. Periodically check relay I/O terminals and CT connections for reliability.

5. Backup system data before configuring protection parameters.

6. For legacy or discontinued relays, confirm stock and alternative solutions in advance.

The structure and details of the product：

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