What is the Maximum Zs earth fault loop impedance value for the TM30D trip unit?
For the NSX TM30D breakers at U=218.5V (This is including the Cmin Factor .95 as per BS7671 amendment 3:2015)
- Zs (5s) = 0.722 ohms
- Zs (0.4s) = 0.55 ohms
You can also find the maximum zs values for our circuit breakers such as ComPacT NSX with TMD trip units using the electrical calculation tool link. When you access the tool, select Display T/I curves and select your circuit breaker. This will show the trip curves as well as the maximum zs values.
Released for: Schneider Electric UK
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