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Putting two protection devices in parallel doubles the amperage allowed for the devices in total. For example, if you put two 40 devices in parallel you end up with 80 amps of protection. Many 5ers are known to be over protected with only a 40 amp or 50 amp circuit breaker. What happens is with frequent use, the resettable breakers will trip causing the slideouts to start & stop excessively. Increasing the amount of amperage allowed by doubling the circuit breakers will prevent much of this since the motors and slideouts should allow it. If after doing this you still experience starting and stopping, this may mean that the slideouts need attention, such as maintenance or adjustment.
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