Spectra™ RMS SEH SKH Standard moulded case/industrial circuit breaker. Frame. 1200 A, 3-pole. 600 VAC system voltage. Interchangeable trip style. SK1200 frame type. LSI trip function. Standard continuous current rated. Suitable for reverse feed. TCAL125 lug. Fixed long time. HACR special marking. Adjustable instantaneous with tracking short-time is standard on all frames. The trip system uses digital sampling to determine the RMS value of sinusoidal and non-sinusoidal currents.