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The ABB 505 Secondary Injection Test Set Powershield unit is a solid state trip device used to protect the power system against damage caused by overload and faults. It is supplied as an integral part of the BBC type LK low voltage power circuit breaker.
A Secondary Injection Test Set Power Shield® - Type LSS Solid State Trip Device & Type 505 Test Set for the following circuit breakers: LK-800, 1600, 2500, 3200, 4000, & 4200