Technical FAQs

Ask a Question

Thanks to help me to measure the Contact Resistance for (NS1600N 3P ,NSX400N , NSX100F )

 "Attached (Contact Resistance on Compact NS_NSX MCCBs.pdf), you will find the new procedures for measuring the contact resistance. The procedure can be summarized as follows:


Pole resistance measurement :
1. Manually operate 5 times the circuit breaker to the OFF and then to the ON position (without current)
2. Apply test current across one pole for at least 30mins
3. Record the millivolt drop and calculate the resistance (R = U / I)
4. Take 3 consecutive measurements operating each time the device and calculate the average
5. Repeat for each pole

Concerning the acceptable value, values less than or equal to 1.3 times the reference value are acceptable in view of measurement u
ncertainties."
Was this helpful?
What can we do to improve the information ?