The ABB SPAD346C is a stabilized differential relay module that provides winding short-circuit and interturn fault protection for two-winding power transformers and generator-transformer units, and interwinding short-circuit protection for generators. It is a legacy product that is no longer in production, but it is still in use in many applications.

The SPAD346C has a number of features that make it a good choice for transformer protection, including:

• High sensitivity and accuracy
• Fast operating times
• Adjustable settings
• Multiple protection functions
• Compact design

Here are some additional details about the SPAD346C:

• Type: Stabilized differential relay
• Application: Transformer protection
• Voltage rating: Up to 69 kV
• Current rating: Up to 2000 A
• Operating temperature: -20°C to +70°C
• Weight: 1 kg

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