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Analogue AC Over Voltage switch

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Augustinn

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This one may sound easy, but ..
I'm looking to build very low power (300mW max) AC switch which will switch off at preset AC voltage. This has to happen in all AC quadrants which means switch has to turn on at same voltage on falling edge as well (SCR if out). For example:
IF Vac < 50V THEN SW1=ON
IF 50V < Vac THEN SW1=OFF
IF Vac > (-50V) THEN SW2=ON
IF (-50V) > Vac THEN SW1=OFF

This would not be a difficult if There is an option to use DC ICs (Opamp, Comp etc). However, this has to run purely on AC. No DC components. Any suggestions?
 

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