DC string circuit-breakers PKZ-SOL

String circuit-breakers instead of fuses

PKZ-SOL12 String circuit-breakers PKZ-SOL are the fuseless alternative for the protection of photovoltaic modules against short circuit.

With their variable trip range, they can be optimally adjusted to the actual short-circuit current of a string. A thermal release reacts at 1.05 … 1.3 fold current and the magnetic release at 6-fold current.

Using the optional shunt release A-PKZ0, remote switching, for example, for the fire brigade is possible.

The easily fitted auxiliary switch NHI-E-PKZ0 provides switch state information.


Skala PKZ-SOL Only the current ratings of the installed overload release are present on the current setting of the circuit-breaker compliant to IEC/EN 60947-2 (section 4.7.3).

For this reason, the tripping current of the switching device and the short-circuit current of the photovoltaic modules must be specified in a suitable format for every point on the scale.


 


Circuit-breaker tripping current Permissible solar module currents
Nominal value


A
Setting range


A
Short-circuit current


A
Rated current at
110 % short-circuit current
A
12
8 – 12
5                 9
5                 8
20
14 – 20
9                15
8                14
30
23 – 30
15              22
14              20
40
34 – 40
22              30
20              27
50
44 – 50
29              38
26              35
60
58 – 63
38              47
35              43