Device Concept; System Limitations; Maximum Distance Between The Rapid Shutdown Box And The Pv Array; Technical Data - Fronius Rapid Shutdown Box - Duo Instructions D'installation

Device concept

The Rapid Shutdown Box provides a convenient and safe way to comply with Article
690.12 in the 2014 Edition of the National Electrical Code. The device is powered directly
by the PV array and is controlled depending on the state of the signal port. This signal
port can be controlled by a relay terminal in the SnapINverter Series. The use of a DC
relay, which also functions as a switch-disconnector, ensures that the PV array is galvan-
ically isolated in the case of a Rapid Shutdown.
The Rapid Shutdown Box ensures that residual energy in the capacitors of the inverter is
discharged within the required time period. To ensure that the entire system functions
correctly, the signal ports of all Rapid Shutdown Boxes must be serially connected (see
section "Connecting the Rapid Shutdown Box"). For this purpose, Duo and Quattro vari-
ants of the device and also the discontinued versions RSB Single and RSB Multi can be
mixed randomly.
The Rapid Shutdown can be initialized by means of AC failure if the signal lines are con-
nected to the inverter. Alternatively or additionally, an emergency stop button that inter-
rupts the signal wires can be used.
System Limita- -
tions -
-
Maximum Dis-
tance Between
the Rapid Shut-
down Box and
the PV Array

Technical Data

Max. voltage
Start voltage
Max. input current
Power supply
Self-consumption during operation
Permissible operating temperature
Permissible humidity
6
Maximum number of Rapid Shutdown Boxes per inverter: 5
Maximum line resistance permitted in the signal loop: 300 W
Maximum permissible wire length for signal loop using AWG 14, 16, 18 or 20: 3200ft
(1000m)
RSB Duo RSB Quattro
600 V DC
80 V DC
25 A 25 A / 25 A
DC (from the PV array)
2 W
-40° F to +149° F (-40° C to +65° C)
0 - 100 % (not condensing)