... life, maintenance-free4. System Configuration:A) Charger: High-frequency switching power module of Emerson HD series or E&C ED series.B ... -acid battery, lead-acid battery, nickel-cadmium battery, etc.C) DC feeder: DC circuit breaker (ABB, Siemens, etc).D) Central monitor: Siemens ... devices for battery and insulation. CE Approved High Frequency Switching DC Power Supply (DCB511G)