Pushbutton Enclosures

Pushbutton enclosures are either rectangular or wedge-shaped (sloped front or top surface) and have cutouts for mounting pushbuttons. They are designed to protect personnel from accidental injury and to prevent the ingress of environmental contaminants such as dust and water. Pushbutton enclosures are rectangular or T-shaped and may include a sloped or slanted surface. They are made from a variety of materials and available in many different sizes, sealing configurations, and mounting styles. Length, width, and height are important dimensions. Inside length, inside width, inside height, and sloped surface length are also important considerations. Because some pushbutton enclosures can be mounted in several different ways, suppliers recommend viewing product pictures or diagrams to determine which dimensions refer to length and which dimensions refer to width. Most pushbutton enclosures are mounted on walls or pedestals.

National Electrical Manufacturers Association (NEMA) ratings indicate whether pushbutton enclosures are suitable for hazardous or non-hazardous locations and designed for indoor or outdoor use. All NEMA enclosures protect personnel against incidental contact with the enclosed equipment. Types 1, 2, 12, 12K and 13 NEMA enclosures are rated for indoor use in non-hazardous locations. Types 3, 3R, 3S, 4, 4X, 5, 6, and 6P enclosures are rated for both indoor and outdoor use in non-hazardous locations. NFPA 70, a publication of the National Fire Protection Association (NFPA), is the basis of several NEMA ratings for hazardous locations. Type 7 and Type 8 NEMA enclosures are designed for Class I; Division 1; Groups A, B, C or D hazardous locations. Type 7 enclosures are rated for indoor use. Type 8 enclosures are rated for outdoor use. Type 9 NEMA enclosures are designed for indoor use in hazardous locations classified as Class II; Division 1; Groups E, F, or G. Type 10 NEMA enclosures are designed to meet the requirements of the Mine Safety and Health Administration (MSHA). Type 11 NEMA enclosures are designed for immersing the enclosed equipment in oil. 

The Ingress Protection (IP) ratings system from the International Electrotechnical Commission (IEC) describes the degree to which pushbutton enclosures provide protection against the ingress of foreign objects and moisture. There are six IP ratings that describe protection against foreign objects. Type 0 enclosures do not provide protection. Type 1 (>50 mm), Type 2 (>12 mm), Type 3 (>2.5 mm), and Type 4 (1 mm) enclosures provide protection against foreign objects of various sizes. Type 5 enclosures provide protection against dust. Type 6 enclosures are dust-tight. There are eight IP ratings for protection against moisture. Type 0 enclosures do not provide protection. Type 1 and Type 2 protect the enclosed equipment against dripping water. Terminal and junction boxes with Type 3 (spraying water), Type 4 (splashing water), Type 5 (water jets), Type 6 (heavy seas), Type 7 (immersion), and Type 8 (submersion) IP ratings are also available.

Selecting pushbutton enclosures requires an analysis of construction materials and mounting styles. Most products are made of aluminum, steel, stainless steel, fiberglass, plastic, polycarbonate, acrylonitrile-butadiene-styrene (ABS), or polystyrene. End panels are often made of clear, infrared, solid, or transparent plastic and include cutouts for DB9 or DB25 connectors. Some devices are designed to sit atop desks or mount in freestanding cabinets or open-frame racks. Others are wall-mounted or fit standard DIN rails. Specialized products are flame retardant, impact resistant, explosion proof, or shielded from electromagnetic interference (EMI) and radio frequency interference (RFI). Pushbutton enclosures with locks, keypads, and knockouts are also available.

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Part Numbers for Pushbutton Enclosures