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The HAC400 Thyristor Stack is available for single and three phase 240/415V applications (other voltages can be accommodated). It can control loads up to 200A, with a number of control options. Assembled to suit the final load, with options of burst firing (3 or 2/3rds phase control) or a combination of both burst firing and phase angle (typically, using the FC36M) . All standard HAC thyristor stacks are fan cooled and fitted with thermal trips for added safety.