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Protect RS485 bus from overvoltage(24V)

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I used PSM712 and PSD12C with 2 resettable fuses(100mA,60V) at output pins(A,B) of RS485 driver IC(ADM485) but these comabination can not protect
driver IC from failure when high voltage (for example 24V) is applied to A ,B and GND lines.

Please help me to design a circuit that is reliable when high voltage is applied to it by mistake in wiring.
 

PSM712 ans PSD12C are RS485 TVS,but ADM485 will fail if we apply 24V between A,B,GND.

Is there any tested circuit ?

There are IC from linear that is +-60VDC tolerant ,but the price is 4 times the ADM485!!!
 

no experience? no help?

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no experience? no help?
 

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