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How to test the Overload relay using Current injection kit for LRD350 ?
The Tesys LRD series reference LRD is a Thermal Overload Relays, which does not have any separate testing procedure available. You have to follow the same procedure of testing specified in IEC 60947-4-1 applicable for all thermal overload relays.
The LRD relays are thermal overload relays which work on the Inverse thermal principle and follow the Tripping curves ( as published in the catalog or instruction sheet) when subjected to the Overload .
These Tripping curves are in accordance with the IEC 60947-4-1 which define the Tripping test point of the LRD as under :
- 1.2 x In and at this value your product should trip in less than 2 hours.
- 7.2 x In and the LRD (class 10A product ) should trip within 2 to 10 seconds.
Where , In = Current Setting
For example, it is normal for the product not to trip at 50A if you set it a 48A, as the tripping threshold will begin around 54.7 A ( 1.14In +/- 0.6) and before this the system may continue to work without tripping at all.
The LRD relays are thermal overload relays which work on the Inverse thermal principle and follow the Tripping curves ( as published in the catalog or instruction sheet) when subjected to the Overload .
These Tripping curves are in accordance with the IEC 60947-4-1 which define the Tripping test point of the LRD as under :
- 1.2 x In and at this value your product should trip in less than 2 hours.
- 7.2 x In and the LRD (class 10A product ) should trip within 2 to 10 seconds.
Where , In = Current Setting
For example, it is normal for the product not to trip at 50A if you set it a 48A, as the tripping threshold will begin around 54.7 A ( 1.14In +/- 0.6) and before this the system may continue to work without tripping at all.
Released for:Schneider Electric Egypt and North East Africa
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