a back-up trip to the breaker feeding upstream

[Polina.raimbekova]

Пожалуйста, помогите перевести!
a back-up trip to the breaker feeding upstream

Фраза встречается в контексте: (защитное реле)
The TRBU output is used to give a back-up trip to the breaker feeding upstream. For this purpose, the TRBU operate
output signal is connected to the output PO2 (X100: 8-9). LED 6 is used for back-up
(TRBU) operate indication.

Заранее благодарна Вам!

Полюся