Appleton™ Mercmaster™ III Low Profile Luminaires

Availability : In stock

The Mercmaster™ III Low Profile Luminaires feature a compact, lightweight, low profile design that is suited for low mounting heights in conjunction with lower wattage fixtures. These enclosed and gasketed fixtures are suitable for hazardous and adverse locations where flammable gases and vapors, combustible dusts, severe weather conditions or excessive moisture or dirt are present

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  • Typical applications include pulp and paper mills, processing plants, chemical plants, oil refineries, foundries, manufacturing plants, storage areas, waste and sewage treatment facilities, parking garages and other areas where dust, water, dirt and roug
  • These medium base lamps accommodate 50 to 150 Watt high pressure sodium (HPS) or 175 Watt pulse start metal halide (PSMH) lamps. There is a wide range of voltages and ballast types available
  • A choice of heat-resistant prismatic glass refractors (NEMA II or V) or heat-resistant globes are available. They thread directly into the ballast housing and seals against a high-temperature silicone rubber gasket
  • Modular design allows scores of fixture component combinations to meet installation and lighting needs. Mounting hoods include cone-shaped pendant, standard pendant, flexible pendant, ceiling and wall (tapped for 3/4″ or 1″ NPT), 25° angle stanchion
  • Reflector choice includes standard dome and 30° angle types, both made of fiberglass reinforced white polyester; highly resistant to unusually corrosive applications. Reflectors are vented for cooler, dirt-free operation and maintained lumen output.
  • Hinge has high lip for added safety during installation and servicing. Hinge and bolt construction assures 360° compression at all points on ballast housing gasket for positive sealing. Swing-away design of captive bolt and nut simplifies servicing
  • Body gaskets and globe gaskets are high-temperature silicone rubber
  • All Mercmaster III mounting hoods have provision for easy field installation of fuses in fixtures (see fuse kit listings on catalog pages)
  • Guards are available to protect globes from damage. Keyhole slots allow easy installation and are secured with stainless steel screws
  • Restricted breathing (AEx nR) and restricted breathing/nonsparking (AEx nA nR) options are available making the Mercmaster III an ideal HID luminaire for use in Zone 2 locations
  • For electrical protection, a ground wire is provided on each Mercmaster to bond hood and ballast housing


NEC/CEC Certifications and Compliances
Class I, Division 2, Groups A, B, C, D; Class I, Zone 2, AEx nA nR IIC (Z2); Class I, Zone 2, AEx nR IIC (ZB); Class II, Division 1 and 2, Groups E, F, G; Class III; Type 4X; IP66; Simultaneous Exposure (Class I, Division 2/Class II, Division 1); Fixture
Specific Wattages
50 W, 70 W, 100 W, 150 W HPS; 175 W PSMH; 60-150 W max. Incandescent
Ambient Temperature
+40 °C to +65 °C (+104 °F to +149 °F)
120, 60 Hz; 120, 50 Hz; 120/208/240/277, 60 Hz; 120/208/240/ 277/480, 60 Hz; 220, 60 Hz; 225, 50 Hz; 230, 60 Hz; 240, 50 Hz; 240, 60 Hz; or 480, 60 Hz
Standard Materials and Finishes
Mounting hoods, bodies and guards are cast copperfree (4/10 of 1% max.) aluminum with electrostatically applied baked gray epoxy-clad finish. Globes are heat-resistant prismatic glass; reflectors are FRP with a polyester finish. Hardware, catch assemblie
Optional Fuse Kits
Fuses can be field-installed. Kits include fuse block, wire connectors and screws for attaching to mounting hood. Fixtures with fuses do not comply with Marine Type Electric Fixtures Outside Type (Salt Water) requirements for marine listing
Optional Photocell
A photocell to provide automatic on-off control is available as an option for all fixtures except those with cone or ceiling mounts