STM250 modular inverter systems System max power STM250 is a sub-rack inverter system integrating TM250 inverter module and TJ20 module. It is a truly redundant system offering functions of pure sine wave inverter, bypass transfer switch and monitor into one 19”3U sub-rack. Single module is hot plug design which make the maintenance an easy job without interruption to your critical load. For 100Vac/110Vac/120Vac , max 4KVA is available. Features: 19”3U Pure Sine Wave, with THD<3% N+1 redundant configuration Hot plug in technology Max efficiency up to 90% DC-AC isolation improving system security Built in bypass transfer switch Quick transfer time 5-8ms Built in monitor module Voltage adjustable 230Vac (200-240) or 110Vac (100-120) Working mode selectable (AC priority or DC priority ) RS485 or RS232 communication port Relay dry contact Built in SNMP card – optional Main Data Input DC input voltage: DC input range: AC input voltage: AC input voltage range: Output Module Power : Power factor: Efficiency: Overload : Transfer time: Others Operating Temp: Isolation: Dimension : Cooling : Enclosure :