UL 3741 Photovoltaic Hazard Control
Sollega's FastRack 510 is a listed component of the first UL 3741-certified PV system in the United States — meeting NEC 690.12 rapid shutdown without a single module-level electronic.
The standard
What is UL 3741?
UL 3741 is the standard for Photovoltaic Hazard Control Systems (PVHCS). It provides a listed, whole-system alternative to module-level rapid shutdown for protecting firefighters from shock hazard inside the array boundary, as required by NEC 690.12. Instead of de-energizing every module with electronics, a UL 3741-listed system is evaluated as a complete assembly to keep first responders safe — letting you build a compliant array with no rapid-shutdown devices at all.
How it works
Meeting NEC 690.12 without rooftop electronics
Evaluated as a whole system
Rather than de-energizing each module, the complete assembly — racking, modules, and inverter — is tested and listed together to limit shock hazard inside the array boundary.
No module-level electronics
A listed PVHCS removes the need for rapid-shutdown devices, optimizers, or microinverters on the roof. Modules connect directly, panel to panel.
Compliant by listing
With an Intertek Authority to Mark, the system meets NEC 690.12 for rapid shutdown — documented and ready for plan review with your AHJ.
The advantage
Why design around UL 3741
Removing module-level power electronics doesn't just simplify the design — it lowers cost, speeds the install, and removes the parts most likely to fail.
65% fewer connectors
Module-to-module wiring cuts failure points and speeds installation.
Nothing on the roof to fail
No MLPE hardware means fewer service calls over the life of the array.
Lower installed cost
Eliminate rapid-shutdown device hardware and the labor to install it.
UL 2703 + UL 3741 listed
Structural and hazard-control certified, with a Class A fire rating.
Proven in the field
First in the nation: Inland Star
Sollega and SMA America certified the FR510-6dg with SMA CORE1 inverters to deliver the first UL 3741-compliant PV system in the U.S. — a 523 kW-DC rooftop in Fresno, California, built with no module-level power electronics anywhere in the array.
Inland Star — First UL3741-Compliant PV Array
523 kW-DC · Fresno, CA · SMA CORE1 · 65% fewer connectors
Resources
UL 3741 documentation
Designing a rapid-shutdown-free system?
Tell us about your array and our engineering team will help you build a UL 3741-compliant design on FastRack racking.
Talk to our teamUL 3741 compliance is a property of the complete listed Photovoltaic Hazard Control System — including the qualified inverter — not of any single component. Confirm the final system listing and local requirements with your inverter manufacturer and authority having jurisdiction (AHJ).
Sollega
Sollega provides racking systems that are compatible with most common solar panels on the market today. Our universal design enables the installation of all framed modules. This ensures our clients can continue using their existing supply chains for modules.
Our Location
Sollega Inc.
San Francisco, CA USA
+1-415-648-1299
info@sollega.com
