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The new name of the MA500 trip unit is MAE500 or STR13MAE500.
The old MA500 trip unit was designed with mechanical feature and new MA trip unit is designed with electronic feature.
Compact NS630 fitted with the STR13MAE trip unit is named as NS630MAE500.
STR13MAE500 trip unit is available under the name of STR13MAE and the reference is 32401.