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This relay is the simplest and most economical of the sterling relay range, it allows two batteries (usually the engine battery and the service battery) to be connected as soon as the engine is running. This relay must be activated by a +12V (or +24V) signal called plus contact (signal active as soon as the engine is running). The range is from 80 to 240A and there are 12 and 24 volt models.
Typical application: Small and medium sized units with two independent batteries but without large consumers (inverter, windlass) that could exceed the power rating of the relay.