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The Red Dot Trinary Pressure Switch places several refrigerant-pressure responses inside one normally closed switch body. One pressure connection monitors the A/C circuit while separate electrical contacts can be used by the compressor and condenser-fan controls at their assigned pressure conditions. With the Red Dot RD5-13705-0, those functions stay in one pressure-sensing component instead of requiring several individual switches on the refrigerant line. Its normally closed logic is the important electrical characteristic for circuits designed around this switch.
PRESSURE SWITCH *D
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