Motor protection relay
SIRIUS 3RN1
Siemens Safety
Applications
Heavy starting (e.g. centrifuges)
Frequency converters
Frequent switching
Impeded cooling, e.g. due to soiled environment
(paper and textile industry, cement works)
Braking operations
"Warning and tripping" function by using two sensor circuits with different response temperatures in order to be able to react before shutdown (e.g. switch in additional cooling, reduce load)
Multimotor protection with a single device, e.g. for
conveyor lines where several motors need to be
switched off simultaneously
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