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Table of Contents
Moulded Case Circuit Breaker Zs Values (MCCB Zs Values) Introduction – 1
NSX 100 - 250 Distribution Trip Units – 2
NSX 100 - 250 Motor Protection Trip Units – 3
NSX 100 - 250 Generator Protection Trip Units – 3
NSX 400 - 630 Distribution Trip Units – 4
NSX 400 - 630 Motor Protection Trip Units – 4
NS 630b - 3200 MCCB's – 5
NS 80 Motor Protection MCCB's – 5
NSC 100 Thermal Magnetic MCCB's – 5
Excerpts
“The Zs values are based on disconnection times of either 0.4 or 5 seconds.” – Page 1
“The Zs value for all Circuit Breakers is calculated by dividing the current required to trip the Circuit Breaker at the required tripping time (0.4 or 5 s) into the phase to earth voltage of the system. The current required to trip the circuit breaker can be found by consulting the tripping curve.” – Page 5
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