A 3-phase DIN rail power supply purpose-built for 24V battery-backed systems, the SITOP PSU3800 6EP3436-8UB00-0AY0 delivers 17A with a battery-optimized U-I output characteristic and 94% efficiency in a 70mm-wide metal housing.

Purpose-Built for Battery Charging

The U-I output characteristic is specifically tailored for lead-acid battery charging: constant-current mode supplies the bulk charge at 17A until the battery reaches float voltage, then transitions automatically to constant-voltage mode for maintenance charging. A DIP switch selects between this battery-charging curve and standard constant-voltage mode for direct DC bus supply or parallel operation.

High Efficiency at Partial Load

At 94% peak efficiency, power loss is just 26W at full 408W load. This matters particularly in battery-backed systems where the PSU may run continuously for years — lower losses mean lower panel temperatures and reduced lifetime energy cost.

Stepped Current Reduction for Thermal Protection

If internal temperature rises, the PSU reduces output current in controlled 2A steps at 30-second intervals — down to a minimum of 20A — rather than abrupt shutdown. This ensures continued operation of critical loads during temporary cooling shortfalls while protecting the unit from thermal damage.