# Transformer Differential Protection IEDs - Protection, Control & Automation

> Verify configuration-specific ratings and compliance in the manufacturer documentation.

> Power/rating scope: See selected product ratings | Voltage scope: See selected product ratings

**Canonical:** https://voltformer.com/category/protection-control-and-automation/transformer-protection-relays - markdown: https://voltformer.com/category/protection-control-and-automation/transformer-protection-relays.md

## Parent

[Protection, Control & Automation](https://voltformer.com/category/protection-control-and-automation.md): Protection IEDs and IEC 61850 automation for transformers and switchgear.

## Sample Products

- [hitachi-ret670 - Hitachi Energy Relion RET670](https://voltformer.com/product/hitachi-energy-relion-ret670.md)
- [abb-ret615 - ABB Relion RET615](https://voltformer.com/product/abb-relion-ret615.md)
- [siemens-7ut85 - Siemens SIPROTEC 7UT85](https://voltformer.com/product/siemens-siprotec-7ut85.md)
- [siemens-7ut86 - Siemens SIPROTEC 7UT86](https://voltformer.com/product/siemens-siprotec-7ut86.md)
- [sel-487e - SEL-487E Transformer Protection Relay](https://voltformer.com/product/sel-487e-transformer-protection-relay.md)
- [sel-787 - SEL-787 Transformer Protection Relay](https://voltformer.com/product/sel-787-transformer-protection-relay.md)
- [ge-multilin-845 - GE Vernova Multilin 845](https://voltformer.com/product/ge-vernova-multilin-845.md)
- [ge-micom-p643 - GE Vernova MiCOM Agile P643](https://voltformer.com/product/ge-vernova-micom-agile-p643.md)

## Technical specializations

- **Two-/Three-Winding Transformer Protection** - Engineered on request: This taxonomy specialization is covered by the dedicated protection/control catalogue. Select the exact IED and verify winding count, CT inputs, algorithms and settings from the OEM manual.

## Official sources

- https://webstore.iec.ch/en/publication/6028

- **Last reviewed:** 2026-09-13

## RFQ

Use the family-specific tools in [the tool reference](https://voltformer.com/tool-reference.md) and the canonical taxonomy at https://voltformer.com/agent-catalog.json. Sub-category: transformer-protection-relays. The transformer query's subCategory parameter applies only to transformer families. Authenticate and obtain explicit confirmation before RFQ submission.