# Relays

Part ID: 7.02a · Layer 7 (Electrical: power distribution (grid to rack)) · child of 7.02

Protection relays that detect electrical faults on HV circuits and trigger the associated breakers to isolate them.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| ABB | manufacturer | inferred | public | ABBN.SW |  |
| GE Vernova | manufacturer | inferred | public | GEV |  |
| Schneider Electric | manufacturer | inferred | public | SU.PA |  |
| Siemens | manufacturer | inferred | public | SIE.DE |  |
| Schweitzer Engineering Laboratories (SEL) | manufacturer | inferred | private |  |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.