... derating1000...4000 m with derating3. FeaturesA) Charger: High-frequency switching power supply module, n+1 redundancy configuration.B) Intelligentized central ... long life, maintenance-free4. System Configuration:A) Charger: High-frequency switching power module of Emerson HD series or E&C ED ... devices for battery and insulation. CE Approved High Frequency Switching DC Power Supply (DCB511G)