Fronius QUATTRO Rapid Shutdown
Fronius, Rapid Shutdown Box-QUATTRO, Multi String, for all 600 Volt inverters 3.8 kW to 15 kW, 2 strings in (4 when used with Branch Connectors), MC-4, 2 Channels out, 25A/25A, 600VDC, includes mounting Bracket, 4,240,154
The Fronius Rapid Shutdown Box has been updated to comply with NEC 2014 and current NEC 2017 article 690.12, which mandates a rapid shutdown feature for PV systems on buildings. For Fronius Primo single-phase inverters ranging from 3.8 kW to 15 kW, these boxes are dependable and simple to mount.
The boxes now have a low-profile design that fits neatly underneath the modules and comes with a mounting bracket for easy rail attachment. On the DC input side, MC4 input connectors rated up to 25A are provided, and spring-loaded terminals are provided on the output circuits for fast and simple wiring. Two strings per input circuit can be wired using MC4 branch or "Y" connectors, for up to two strings with the DUO rapid shutdown box and up to for strings with the QUATTRO rapid shutdown box.
If AC is not supplied to the inverter, the box is activated, and the voltage and current in the DC wiring between the array and the inverter are easily discharged. The DUO box can accommodate one or two DC strings, while the QUATTRO box can accommodate two, three, or four DC strings, each with a maximum rating of 600 VDC and 25 A per combined output circuit.