Warom HRMD91-400A-8L-SS Explosion Proof Industrial Power Distribution Panel

HRMD91-400A-8L-SS: SS likely denotes Stainless Steel material.

This is a high-capacity Explosion-Proof (Flame-Proof) Power Distribution Panel rated for a massive 400 Amps with 8 output circuits and an enclosure constructed from Stainless Steel (SS). It is engineered for the core of hazardous operations where large amounts of power need to be distributed safely and reliably.

Breakdown of the Model Number

Following the manufacturer's likely coding convention:

HRMD91: The base series or model number. This indicates it belongs to the same family as the previous 250A model, sharing the same fundamental design, certification standards (e.g., ATEX, IECEx), and overall enclosure style, but scaled up for higher capacity.

400A: The main incoming current rating. This is the most significant upgrade. The panel is designed to handle a maximum continuous current of 400 Amps on its primary input feeder. This suggests it's feeding a larger plant area or several very large loads (e.g., big motors, multi-bay lighting systems).

8L: Indicates the number of outgoing circuits.

8 = Eight individual output circuits.

L = Stands for "Line" or "Circuit." This provides more distribution points than the 6-circuit model, offering greater flexibility for connecting equipment.

SS: This is the critical specification for the enclosure material. It stands for Stainless Steel.

This is a step up in durability and corrosion resistance from the "VI" (Corrosion Protected) rating, which could be achieved with coated cast aluminum or other materials.

Stainless Steel (typically Grade 304 or 316L) is chosen for environments with extreme corrosion potential, such as:

Offshore marine platforms (saltwater spray)

Chemical processing plants (acidic/alkaline vapors)

Pulp and paper mills

Food and beverage processing (requires cleanability and resistance to corrosive cleaning agents)

Comparison with the HRMD91-250A-6L-VI

Feature HRMD91-250A-6L-VI HRMD91-400A-8L-SS Implication

Current Rating 250 Amps 400 Amps The -400A model handles significantly more power, serving larger facilities or heavier machinery.

Number of Circuits 6 Circuits 8 Circuits Provides more individual distribution points, allowing for connection of more equipment.

Enclosure Protection VI (Corrosion Protected) SS (Stainless Steel) The -SS model is for the most aggressive environments where superior corrosion resistance is mandatory.

Key Features and Operational Considerations

Massive Enclosure: A 400A explosion-proof enclosure is large, extremely heavy, and very expensive. The stainless-steel construction adds further to the cost and weight. Installation requires careful planning and heavy-duty supporting structures.

Internal Components: The internal components are significantly larger to handle the 400A current:

Main Breaker/Switch: A much larger 400A rated disconnect.

Busbars: Heavy-duty, high-capacity copper busbars to minimize heat and voltage drop.

Branch Protection: The eight output breakers or fuse assemblies will be rated for their respective loads but are housed within a platform designed for high fault currents.

Heat Dissipation: Distributing 400A of current generates substantial heat. The design will incorporate significant heat sinking, often using the massive enclosure itself as a heat sink, and must be certified to operate within safe temperature limits for the specific hazardous area classification.