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What is meant by reflex tripping for NSX breakers

Compact NSX100 to 630 devices incorporate the exclusive reflex-tripping system.
This system breaks very high fault currents.
The device is mechanically tripped via a "piston" actuated directly by the pressure produced in the breaking units by the short-circuit.
For high short-circuits, this system provides a faster break, thereby ensuring discrimination.
Reflex-tripping curves are exclusively a function of the circuit-breaker rating.
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