Energy Efficiency Devices Energy Efficiency Devices B23 UL Energy Meters: B23 112-500 & B23 312-500B23 are simple precise UL energy meters for three-phase measuring. Circuit Monitoring SystemUltra-compact and high-performance multichannel measurement system for AC and DC branch monitoring. Publications Application and TechnicalBrochuresCatalogs and Buyers GuidesCertificates/Declarations of ConformityData SheetsInstallation and Instruction Other Measuring & Monitoring Power Meter & Safety Relay ABB Ability Energy Management Energy Efficiency Devices