ABB SPAD346C Stabilized Differential Protection Relay

Product Description

Technical Specifications

• Model: SPAD346C
• Brand: ABB, Origin: Switzerland
• Device Category: Stabilized transformer differential protection relay
• Rated Frequency: 50Hz / 60Hz configurable
• Rated CT Input Current: 1A or 5A
• Auxiliary Power Supply: 80‑265V AC / DC wide‑range power supply
• Max Power Consumption: ≤15W
• Binary Input: 5‑way programmable control inputs
• Relay Output: 4 heavy‑duty trip‑relays, 5 signal‑indication relays
• Communication Interface: RS485, Modbus RTU protocol
• Operating Temperature: -25℃ ~ +70℃
• Storage Temperature: -40℃ ~ +85℃
• Ambient Humidity: 5%–95% non‑condensing industrial environment
• Installation Form: 1/2‑size 19‑inch rack‑mount plug‑in unit
• Net Weight: Approx.0.75kg

• Certifications: CE, IEC‑60255, industrial EMC anti‑interference certification

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Key Features

1. All‑in‑one protection combining differential, graded over‑current and configurable earth‑fault protection for transformers.
2. Second‑harmonic inrush restraint and fifth‑harmonic over‑excitation blocking to prevent undesired relay tripping.
3. Stable operation under CT‑saturation circumstances during external short‑circuit failure.
4. Built‑in breaker‑failure protection and disturbance recorder for post‑accident waveform analysis.
5. Digital vector‑group adaptation and wide‑range CT‑ratio correction without extra matching current transformers.
6. Abundant programmable binary‑input and relay‑output terminals for flexible inter‑lock logic configuration.
7. RS485 Modbus‑RTU communication, supporting remote parameter setting and real‑time data upload.

8. High electromagnetic interference resistance, stable long‑time running inside harsh high‑voltage switch‑gear rooms.

9.