The ACE3000 type 100/110 are electronic polyphase meters with electromechanical registers. These meters are available for single (type 100) and double tariff (type 110) and in four different registering modes. They can also be used as two-phase or single-phase meter depending on the network condition. Up to two optional S0 pulse outputs allow functional upgrades such as Automatic Meter Reading or integration into a prepayment system, such as ACE9000 PayGuard.