The F&F SZR-278 Backup Power Controller automatically switches to backup power when the parameters of the active line degrade or the voltage is interrupted. It monitors the presence and sequence of phases, as well as asymmetry. It features protection from minimum and maximum phase voltage, relay and microautomatic control, load protection against voltages above 400 V, and programmable and electrical interlocking safety.

• Brand: F&F
• Type: relay
• Operating voltage: 230 V
• Protection degree: IP20
• Controlled lines: 3 x 400 V + N (four-wire)
• Number of controlled lines: 2
• Power supply voltage: 24÷264 V AC
• Frequency: 45÷55 Hz
• Maximum voltage: 450 V AC
• Relay outputs: 4
• Maximum load current: 16 A
• Maximum relay coil current: 2 A
• Operating temperature: -20÷40°C
• Installation: on 35 mm DIN rail