12V 30 amp voltage-sensing relay: switches power to a caravan's battery-charging and fridge circuits when vehicle alternator is charging. Protects the vehicle battery from drain when the engine is off. Voltage-sensitive switching - requires no trigger.
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12V 22 amp voltage-sensing relay: switches power to a caravan's battery-charging and fridge circuits when vehicle alternator is charging. Protects the vehicle battery from drain when the engine is off. Voltage-sensitive switching - requires no trigger.
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24V 30 amp voltage-sensing relay: switches power to a caravan's battery-charging and fridge circuits when vehicle alternator is charging. Protects the vehicle battery from drain when the engine is off. Voltage-sensitive switching - requires no trigger.
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Standard 4-pin 12V/30A power to switch on relay.
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