Energy Limiting Devices and I2t


For details on thermal withstand and I2t, see I2t Thermal Withsand. Energy limiting devices reduce the I2t let-through in the event of a fault.  The values are typically specified by the manufacturer:

MCB Energy Limit

Typical MCB Energy Limiting Characteristic

Using typical data given above, for a 10A, 10kA fault rated MCB would have an Ip/A of 1000 (103), give an energy let-through of approximates 2,000 A2s.

 

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