In the USA, electrical installations need to have surge protection. The current safety standard NFPA 79 (Edition 2018) defines the use of surge protection devices in machines with safety circuits. According to NFPA 79, surge protection products must ensure voltage limitation according to the insulation coordination. This requirement is met by devices of the VARITECTOR PU US series. They are UL listed, which includes the requirements of NFPA 79. The product series has been specially adapted to the North American market. In addition to the requirements of UL 1449 Ed. 4, it also meets the EN 61643-11 standard and can therefore be applied worldwide.
The specially developed integrated disconnection mechanism enables safe operation with a short-circuit resistance (SCCR) of up to 200 kA. All products are approved as Type 1 CA according to the highest UL classification.
All products in the VPU AC series have a highly visible optical indicator. Variants with pre-warning status indication also ensure uninterrupted protection, as the integrated remote signalling contact already reports the pre-warning signal to external monitoring systems.
The products have been adapted to the North American grounding networks such as WYE or DELTA. They are simultaneously approved to UL 1449-4 and VDE – for worldwide use in any application.
VARITECTOR PU AC US meets the requirements of NFPA 79
• Compliance with NFPA 79 (Edition 2018) for the entire product series
• UL-Listed Mark of conformity on all product variants
• Simplified approval of plants used for the North American
• Worldwide applicable due to simultaneous compliance with EN 61643-11