An industry leading boat builder's vessel uses a 120/240V system protected by a 3-Pole 50Amp C-Series breaker. When the neutral wire became broken or lifted, the unchecked 240V was destroying expensive 120V on-board electronics.

Common causes for lifted, or dropped neutral:

1. Sub-standard, or poor/faulty wiring at the marina

2. Incomplete shore power plug connection - making two of three contacts

3. Inadvertent disconnection of shore cables by marina personnel or other boat owners.

Although isolation transformers can be used to address this situation, they are costly, require counterbalancing to adjust the centerline, and do not include integral circuit protection. To counter the deficiencies of the isolation transformer solution, Carling designed and developed a voltage sensing PDC incorporating a combination of our relay trip constructed circuit breakers and voltage sensing relays. The internal circuit is designed to ensure that when a lifted/dropped neutral condition occurs, the relays signal the relay trip portion of the circuit breaker and immediately open the circuit before the runaway high voltage has an opportuntity to destroy expensive lower voltage on-board electronics.

Our Marine Voltage Sensing PDC provides the boat builder with a cost-effective solution, which is lighter in weight and easier to install, than their isolation transformer solution. As a result, the boat builder is now utilizing the Carling PDC to protect their expensive 120V on-board electronics.

Any 120/240V application that requires protection from occurrences of costly lifted/dropped neutral conditions.