Speedy Shutdown choice to know: IMO FireRaptor receives UL PVRSS Itemizing with Fronius


IMO Automation informs us that its FireRaptor has received the UL PVRSS listing (Photovoltaic Rapid Shutdown System) for the Fronius Primo family of solar inverters in accordance with the UL1741 guidelines.

IMO Automation worked closely with Fronius to achieve this listing as it required the development of an additional capacity vent circuit to divert the stored current when the rapid shutdown began. This product has also been certified by UL as a PVRSE (Photovoltaic Rapid Shutdown Equipment) component for use in the required categories.

These new offerings complement IMO’s current UR-listed FireRaptor offering for NEC 2017 and NEC 2020 compliance, thus providing a complete agnostic solution for all inverters on the market.

“The support of efforts and inverter manufacturers in the marketplace is key to enabling the continued growth of the industry as progressive NEC regulations are adhered to,” said Joe Covington, general manager, IMO Automation. “It is these partnerships and the convenience they have when they turn to IMO for a safe and reliable rapid shutdown solution that sets us apart from the competition.”

How FireRaptor works

The FireRaptor is designed for installation at solar module level and offers a safe shutdown of the DC power supply to ZERO volts in an emergency. Shutdown is initiated in three ways: manual operation via an emergency stop switch (which can be conveniently located at floor level for easy access), interruption of the AC power supply, or a temperature rise trigger.

The FireRaptor works like a circuit breaker, making the FireRaptor compatible with all string inverters and not affecting their operation or performance in any way. In addition, the FireRaptor was developed for fail-safe operation to ensure that subsequent damage to the FireRaptor (e.g. due to a fire) does not affect the insulation and the shutdown status of the solar module. In fact, the FireRaptor has been tested for destruction by TÜV in Germany, with full zero-volt isolation maintained throughout the testing process.

Each FireRaptor operates two solar modules and is positioned behind the modules and attached to the panel mounting frame. The FireRaptor has an output of 700 W and is therefore suitable for most types of solar modules currently available on the market.

IMO FireRaptors are connected in series using plug-and-play connections. The signal cable is then routed to the emergency switch, which can be located anywhere inside or outside the building. As soon as the emergency switch is activated, the FireRaptor shuts down the solar modules by isolating all DC cables in the building directly behind the switchboard installation. In a larger, multi-storey building, there can be several emergency switch units in several zones around the building or on different floors as required.

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