Fronius Backup Controller 3P-35A (4,240,047,CK) - 3-Phase Emergency Power Controller for PV Systems

The Fronius Backup Controller 3P-35A is a 3-phase backup power controller designed for photovoltaic systems, providing automatic grid disconnection and reconnection in under 20 ms. It enables seamless backup power supply when paired with compatible Fronius GEN24 Plus inverters.

Advantages

Rapid switching ensures uninterrupted power to critical loads during grid outages. Integrated grid monitoring and black start support enhance system reliability. The passive convection cooling design ensures silent operation and low maintenance.

Suitable for

• Residential and commercial PV installations requiring backup power
• Systems using Fronius GEN24 Plus or Symo GEN24 Plus inverters
• Three-phase grid configurations with up to 35 A per phase

Key specifications

• Rated current: 35 A per phase
• Nominal grid voltage: 3x 230V / 400V AC
• Switching time: < 20 ms
• Enclosure protection: IP65
• Operating temperature: -25°C to +60°C
• Mounting: Wall mounting
• Max. continuous backup power: approx. 24.2 kW

Recommendations

Pair with Fronius GEN24 Plus inverters for full backup functionality. Ensure installation by a qualified electrician in accordance with local regulations.