Projoy PEFS-EL55-4 – PV firefighter safety switch (rapid shutdown) with MC4 connectors
PEFS-EL55-4 is an automatic firefighter safety switch mounted on PV strings. In an emergency it physically disconnects the DC voltage of the panels so that firefighters can work safely on the roof.
How it works
The device monitors the AC voltage of the installation. When AC power is cut (by rescue teams or due to a failure), PEFS automatically disconnects the DC circuit between the panels and the inverter within seconds, reducing the string voltage to a safe level (below 80 V) within 30 seconds. When AC power returns, the switch resets and reconnects automatically.
Key features
- Factory-fitted MC4 connectors – ready to connect, no crimping
- Automatic disconnection of DC strings on AC loss
- Additional thermal protection – shuts off when operating temperature is exceeded
- Emergency trigger possible (button / remote control module)
- Outdoor enclosure IP66, flame-retardant, UV-resistant
- Protection class II
