PROJOY MC4 PEFS-EL40H-4 Fire Fuse (for 2 strings)

Fire safety switch 2 strings for photovoltaic systems PV PEFS-.EL40H-4 2MPPT PROJOY - designed to safely and abruptly cut power to a photovoltaic system in the event of a failure and/or fire. The switch is suitable for mounting on two strings. In the event of a fire, firefighting crews can be exposed to serious risks due to the current flowing in the PV system (even after the DC switch between the inverter and the panels has been switched off). If firefighters have switched off the alternating current (AC) (for example Wp - 1s alarm breaker) before addressing the fire, the PEFS series safety switch will detect a mains fault and automatically switch off the insulation switch after 5 seconds. The switch should be mounted close to the photovoltaic panel, ensuring a safe environment for firefighters - reducing potential damage and ensuring the safety of the photovoltaic system. The switches can be used directly with photovoltaic panels. The PEFS series resets automatically when AC power is restored - the switch will connect the circuit without user intervention.

The switches are equipped with aPEDS switch, the most popular DC switch for PV systems worldwide. The response time of the switch mechanism is only 5 milliseconds, ensuring that the arc is extinguished very quickly. PEDS is considered by many PV inverter manufacturers the best and preferred DC switch.

1. Time is of the essence in a firefighting operation
The PEFS fire safety disconnector complies with international
standards and harmonises with typical fire service working procedures. As a result
of the firefighting action, when the building's AC grid is
is cut off, the PEFS disconnector automatically disconnects and isolates the PV panels, in effect
eliminating the high DC voltage inside the building. This will enable the fire brigade
to carry out a quick and safe intervention.

2. Full insulation of photovoltaic panels
The PEFS Fire Safety Disconnector uses an insulation
disconnector, which can be used directly to disconnect electrical
circuits with high voltage and current. n the event of a fire, the PEFS
instantly disconnects the PV chain by lowering the voltage in the DC cables. Should
it be necessary to reduce the DC voltage on the roof to an even lower level,
multiple disconnectors may be used. For example, to lower
the voltage to 80v~120V one disconnector should be used every 2-3 panels.

3. Automatic Restart
The Projoy PEFS Fire Safety Disconnector resets
automatically. In a situation where AC power is switched off (for instance during
power break) and is later restored, PEFS will automatically restart
the PV system, without the need to manually reset the protection.

4. No need for an additional network
Compared to typical insulation disconnectors that are remotely controlled,
Projoy PEFS is directly controlled by the voltage in the AC conductor and does not
require any additional control. Moreover, PEFS does not use
electronic components to disconnect, but an insulating disconnect switch with
arc extinction, which provides for a complete disconnection of the DC
wires and contributes to more stable operation of the device.

5. Inverter life extension
using the Projoy PEFS provides automatic disconnection of the DC side in the event of
power failure on the AC side, resulting in a significant increase in the life of the inverter,
and making possible safer repair and replacement if required.

6. Choose a proven type of disconnector for DC
The Projoy PEFS fire safety disconnector is equipped
with the Projoy PEDS disconnector, which is the world's most popular used
DC disconnector in photovoltaics. The response time is only 5 milliseconds, allowing
the electric arc to be extinguished in an instant. Combined with self-cleaning contacts
the disconnector provides increased durability and guarantees stable operation.
Because of its reliability, the Projoy PEDS disconnector has also been selected by
many leading inverter manufacturers.

7. Professional DC disconnector manufacturer,
Projoy, boasts extensive experience in DC disconnector design, and a worldwide
customer base. Projoy is the number one company developing
DC disconnector technology in China. The PEFS disconnector, thanks to its fully
automatic operation and its ability to extinguish electric arcs, effectively
protects PV systems