Please find attached document for stepwise explanation of Primary current injection testing procedure for MCCB with TMD Trip unit. The test method method that MCCB can be tested with single phase as well as three phase. Single phase test results might not be the same as three phase testing together..
Note: TMD has its co-efficiency when test on ambient temperature different than 40 degree, and also when test is done on one pole For all the TMD curves, You may know that the catalogue tripping curves are given for an ambient temperature of 40°C in cold start condition and 3 poles loaded.
For 1 pole tripping, read the time corresponding to 0.85 times given current.
Note: TMD has its co-efficiency when test on ambient temperature different than 40 degree, and also when test is done on one pole For all the TMD curves, You may know that the catalogue tripping curves are given for an ambient temperature of 40°C in cold start condition and 3 poles loaded.
For 1 pole tripping, read the time corresponding to 0.85 times given current.
Released for: Schneider Electric India
