| Subject | Portuguese | English |
| mech.eng., construct. | relay autorretentor | self hold relay |
| mech.eng., construct. | relay de falta de fase | phase failure relay |
| mech.eng., construct. | relay de impulsos sucessivos | notching relay |
| mech.eng., construct. | relay de proteção de fase | phase protective relay |
| commun. | "relay" de tramas | frame relay |
| mech.eng., construct. | relay lento | slugged relay |
| comp., MS, Braz. | Relay Server | relay server (A server that manages the exchange of messages or information among different users) |
| el. | relay temporizado | timed relay |