Fronius Rapid Shutdown Box Duo

The Fronius 4240153 Rapid Shutdown Box Duo is a photovoltaic rapid shutdown (RSD) accessory designed for solar installers needing code-compliant array disconnection. Rated for up to 600 VDC and 25 A maximum PV input, it manages up to two strings via a single MC-4 input circuit (two with an MC-4 Y connector). Powered directly from the PV array with an 80 VDC start voltage, it draws only 2 W of typical self-consumption during operation.

Key Features:

• Max PV input 600 VDC / 25 A
• Max output current 25 A
• Start voltage 80 VDC
• Typical self-consumption 2 W, DC array powered
• Up to 2 strings, 1 MC-4 input circuit
• Max DC homerun wire AWG 8, comms AWG 14
• NEMA 4X enclosure, -40°F to 149°F
• Two conduit ports, 3/4 in and 1 in
• UL 1741, FCC 15 Class B, LTR AE-004-2015
• 10-year warranty

Ideal for residential and commercial PV systems requiring rapid shutdown compliance, the Box Duo suits installers building two-string arrays. Its NEMA 4X enclosure and rating up to 13123 ft elevation with 0-100% non-condensing humidity make it dependable across demanding Canadian outdoor climates. Order the 4240153 from Circuit Solar, in stock in Canada and shipped from Red Deer, AB.