en.Wedoany.com Reported - Altech's LSF/RT series disconnect switches are UL 60947-4-1 certified, meeting the stringent fire safety requirements of HVAC systems using A2L refrigerants; the series features a spring-loaded design to prevent DC arc contact burning and has completed third-party testing verification in compliance with the latest UL/IEC standards.
Traditional refrigerants such as hydrofluorocarbons (HFCs) pose ongoing environmental hazards due to their high global warming potential (GWP) and long atmospheric lifetimes. The U.S. Environmental Protection Agency (EPA), under the American Innovation and Manufacturing (AIM) Act and global regulations like the Kigali Amendment to the Montreal Protocol, is phasing out HFC refrigerants, aiming to reduce HFC production and consumption by 95% by 2036. Next-generation refrigerants replacing HFCs are classified as A2L by ASHRAE Standard 34, with lower GWP but higher flammability than their predecessors. Therefore, components such as disconnect switches used in HVAC systems must meet fire safety requirements, and manufacturers need to certify and design according to standards like UL 60335-2-40 to prevent accidental ignition. For disconnect switches, UL 60947-4-1 has been updated to specify requirements for components used in A2L refrigerant systems regarding industrial control characteristics.
The LSF/RT series are AC/DC dual-rated switches, offering 600V AC and 60V DC ratings, helping panel builders and HVAC equipment OEMs reduce part counts and simplify the supply chain. LSF models feature extended handles, while RT models are door-mounted with rear terminals. The series is available in 16A, 30A, and 40A versions, with impact- and chemical-resistant plastic enclosures, silver contacts and rivets for enhanced conductivity and lifespan, suitable for space-constrained installations with a wide operating temperature range. A major builder recently selected this series of disconnect switches for a large-scale A2L-based HVAC project; Altech has a long history of supplying switch and disconnect switch components in large HVAC applications such as hotel rooms.
The series' key UL certification for A2L applications, combined with Altech's experience in the HVAC field, makes these disconnect switches suitable for climate control systems where fire safety, reliability, and space savings are critical requirements.
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