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The design of the new Masterpact NW arc flash-protecting circuit breaker is unique to the industry. The blow-open terminal is shaped so there is a reverse current loop at the moving arm. This reverse current flow creates a magnetic force that is proportionate to the amount of current.
When the current is high enough, the force pushes open the contacts. The contacts open very quickly, without waiting for the mechanism to unlatch and the springs to pull the moving arm open. Between the folds of the blow-open terminal, where the reverse current loop is located, is the U-magnet, which intensifies the magnetic opening force. The Masterpact NW arc flash-protecting circuit breaker is designed to open quickly. This quick-opening action clears the fault and reduces the arc flash incident energy.
The new technology employed in the Masterpact® NW and NT circuit breakers make them unique in the industry. The technology provides the following benefits:
Masterpact NW and NT circuit breakers installed in PZ4 switchgear make possible smaller and safer installations. Since the Masterpact NW and NT circuit breakers do not need fuses, the following problems are eliminated:
UL Listed Masterpact NT Series with Arc Flash Protection