Control and supervision of pressure is required particularly with pneumatic and hydraulic operating mechanisms that use nitrogen to store energy. A multipole operating pressure switch perfoms the following functions: close replenishment valve, i.e. stop pump or compressor; open replenishment valve, i.e. start pump or compressor; interlock auto-reclosure if pressure is insufficient; interlock closing operation, prevents breaker closing if it then cannot open because pressure is insufficient; interlock opening operation, prevents breaker opening if pressure is insufficient.