Datasheet

Big protection for little money
PV fireman's switches are DC switch-disconnectors that isolate the lines between solar
modules and inverters. They allow firefighters to operate without risk of electrocution.
In addition to the SOL30-Safety for small installations Eaton offers prefabricated
fireman's switches housing 2, 3, 4 or 6 switch-disconnectors in a common enclosure. In
contrast to generator terminal boxes the individual strings are not connected in parallel
but can be fed separately to the inverter. This allows the use of several MPP trackers and
helps optimize the inverter’s performance.
In the event of fire or other hazards, undervol-
tage releases trip the fireman's switches. The
undervoltage releases respond with a delay of
600 ms, so that more than 93% of all brief
power failures and voltage drops will not cause
a trip, preventing downtimes caused by erro-
neous tripping.
All fireman's switches feature auxiliary con-
tacts with one N/O and one N/C contact. The
N/C contacts in the combinations are factory-
wired and connected to the modular terminals.
This allows the switching position of the PV
fireman's switches to be queried and, for
example, indicated with an external indicator
lamp. The fireman's switches are available with
metric screw connection or with MC4 sockets.
On the metric devices all cables are connected
to the modular terminals, which guarantee a
fast and simple installation.
The enclosures have degree of protection IP65
and feature a pressure equalization element to
avoid condensate formation in the enclosure.
This makes Eaton’s fireman's switches ideal
for outdoor use, although a protected moun-
ting location is recommended.