QFire BIG fireman’s switch for disconnecting up to 16 strings

QFire BIG fireman's switch + overvoltage protection also for fire alarm systems

QFire BIG for large and rooftop installations

 

The QFire BIG box is suitable for individual standard installation or also project-specific for a customised application. We take into account other customer-specific requirements and thus also offer the easiest to install variant for retrofitting existing PV systems. All individual requirements are taken into account. QFire BIG is independent of the manufacturer of the modules or inverters, can be equipped with overvoltage protectors and is supplied in a high-quality plastic or metal housing, as desired.

  • safe disconnection of the PV generator even in case of emergency
  • complete set; modularly expandable as well as very easy installation
  • suitable for retrofitting
  • AC coupled, it can therefore be triggered at any time via the mains
  • automatically switches back on after a power failure
  • arc-free switching due to modern switching technology
  • control box can be switched on and off by an external key switch
  • status can be transmitted to the signalling point via a potential-free contact

QFire BIG fireman's switch + overvoltage protection also for fire alarm systems

The central emergency shutdown for PV systems is suitable for fire alarm systems and can be connected to the central fire alarm.
The system can be switched off via an external switch.

QFire BIG 16-String Cut-Off with Integrated Slave Controlbox

Number of strings
for up to 16 strings/BIG Box (customised)
Extension
can be cascaded as required
IP class (plastic | metal)
IP64 | IP44
Mounting location
protected outdoor area
Max. system voltage per string
1.200 VDC (other ranges on request)
Max. string current (Isc)
11 A (other ranges on request)
Temperature range operation
-15 to+60° C
Connection AC side
Wieland connector
DC Connection
MC4 4,0 - 6,0 mm²
Switching method
galvanic isolation
Control voltage
12 VDC
Monitoring
Status LED
External switch
potential-free contact
Housing dimensions control box (L x W x H, without plug)
175 x 175 x 75 mm
Housing dimensions switch box (plastic | metal)
600 x 400 x 132 mm | 600 x 400 x 150 mm
Weight of control box
1.055 g
Weight of switch box (plastic | metal)
approx. 11 kg | approx. 15 kg
Standards
CE, DIN EN 60947-3:2010-02
Area of application
large-scale systems, rooftop systems
QFire fireman's switch flame

central emergency switch-off for PV systems, customised variants adapted to the respective system

QFire fireman's switch flame

suitable for fire alarm systems, can be connected to the central fire alarm

QFire fireman's switch flame

suitable for all modules/inverters, regardless of the manufacturer

QFire fireman's switch flame

plastic or metal housing, with or without overvoltage arrester

QFire fireman's switch flame

safe disconnection of the PV generator even in case of emergency

QFire fireman's switch flame

arc-free switching due to modern switching technology

QFire fireman's switch flame

complete set; modularly expandable as well as easy installation

QFire fireman's switch flame

control box can be switched on and off by means of an external key switch

QFire fireman's switch flame

AC coupled, it can therefore be triggered at any time via the mains

QFire fireman's switch flame

status can be transmitted to the signalling point via a potential-free contact

QFire fireman's switch flame

switches on again automatically after a power failure


 

In this case, we equipped an industrial building with a 1 MW rooftop system (128 strings) with generator isolation and overvoltage protection. The QFire BIG switch boxes also contain T2 surge arresters. A T1+T2 combination arrester would also be possible here. Each of these BIG switch boxes switches up to 16 strings.

QFire BIG fireman's switch + overvoltage protection
QFire BIG fireman's switch + overvoltage protection

 

Fireman's switch for PV system QFire Tool for dimensioning generator disconnection Made in Germany