The DTK-120HWLOK Surge Protective Device (SPD) with NFPA 72 2013 10.6.5.2 compatible lockout kit protects 120VAC equipment panels and dedicated branch circuits while preventing accidental alarm disconnect Approved for 20A circuit breakers. DITEK?s DTK-120HWLOK surge protection and lockout kit protects 120VAC equipment panels and dedicated branch circuits while preventing accidental alarm disconnect.SCCR rating of 10kAIC complies with NEC Article 285.6NEMA 4X weatherproof enclosure allows for use in harsh environmentsLockout kit prevents accidental disconnect of fire alarm systemUL1449 4th Edition Type 1 SPDDiagnostic LED