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QYU 277 Vac supplementary protectors are available for surface, flush or DIN-rail mounting in 1-pole construction.
These devices are designed to provide supplemental overcurrent protection in accordance with Article 240-10 of the 2005 NEC, which states that thermal-magnetic supplementary protectors cannot be used to replace the primary branch-circuit protection in an application. When used in combination with branch-circuit protection, as required in Article 210 of the 2005 NEC, these supplementary protectors can be used to protect lighting fixtures, appliances and other equipment or internal circuits and components of equipment.