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A Deep Dive into NEMA 4 and NEMA 4X Enclosures: What Sets Them Apart?

NEMA enclosures play a crucial role in protecting sensitive electronic equipment from environmental factors such as water, dust, and corrosion. Two popular types of NEMA enclosures are NEMA 4 and NEMA 4X. While they both offer similar levels of protection, there are key differences that set them apart. In this blog, we will take a deep dive into NEMA 4 and NEMA 4X enclosures and explore what makes them unique.

NEMA 4 Enclosures:
NEMA 4 enclosures are designed to provide exceptional protection against the ingress of water, spraying water, and dust. They are commonly used in outdoor and indoor applications where the equipment requires protection from water, humidity, and dirt. Here are some key features of NEMA 4 enclosures:

Waterproof: NEMA 4 enclosures are constructed with gaskets and seals to ensure a tight and secure seal, making them waterproof and ideal for harsh and wet environments.
Protection against dust: These enclosures are also dust-tight, preventing the ingress of small particles and debris that could damage equipment.
Corrosion-resistant: NEMA 4 enclosures are typically made of stainless steel, aluminum, or fiberglass-reinforced polyester, which are resistant to corrosion caused by exposure to water or other harsh environmental conditions.
Capability for outdoor use: With their robust construction and protection against water and dust, NEMA 4 enclosures are well-suited for outdoor applications such as in the agricultural, oil and gas, or marine industries.


NEMA 4X Enclosures:
NEMA 4X enclosures share many similarities with NEMA 4 enclosures but are specifically designed to offer superior corrosion resistance. They provide the same level of protection against water, dust, and environmental hazards as NEMA 4 enclosures but excel in harsher environments. Here are some distinguishing features of NEMA 4X enclosures:

Extreme corrosion resistance: NEMA 4X enclosures are typically made of highly corrosion-resistant materials such as stainless steel, fiberglass-reinforced polyester, or polycarbonate. These materials withstand corrosive substances, chemicals, and even saltwater environments without compromising their structural integrity.

Additional protection: In addition to protecting against water and dust, NEMA 4X enclosures offer resistance to caustic chemicals, oils, and UV radiation, making them suitable for industries such as food and beverage, wastewater treatment, and chemical processing.

Enhanced durability: The materials used in NEMA 4X enclosures are designed to withstand extreme fluctuations in temperature, high-pressure washdowns, and physical impacts, ensuring long-term durability and protection of sensitive electronics.


In summary, both NEMA 4 and NEMA 4X enclosures provide excellent protection against water, dust, and environmental factors. However, NEMA 4X enclosures take it one step further by offering enhanced corrosion resistance and the ability to withstand more aggressive conditions. When selecting an enclosure for your specific application, consider the environmental factors, such as exposure to chemicals or extreme temperatures, to determine whether a NEMA 4 or NEMA 4X enclosure is the most suitable choice. Ultimately, both types of enclosures provide reliable protection for your valuable electronic equipment, ensuring their performance and longevity in demanding environments.

Order Your NEMA 4X  Enclosure Today
APX Enclosures is a leading manufacturer of NEMA 4X outdoor enclosures. We will make your custom enclosure with quality and precision to meet your needs.
For more information or to order your cabinet, contact us online today.

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