Warom HRMD91-250A-6L-VI Explosion Proof Industrial Power Distribution Panel

HRMD91-250A-6L-VI: VI likely denotes inclusion of a Voltmeter (V) and Ammeter (I).

This is a highly specialized piece of equipment designed for safety in hazardous environments. Here’s a detailed explanation:

Overall Purpose

This is an Explosion-Proof (Flame-Proof) Power Distribution Panel rated for 250 Amps with 6 output circuits and a specific VI corrosion protection level. Its primary job is to safely distribute electrical power within areas where flammable gases, vapors, dusts, or fibers are present (e.g., oil refineries, chemical plants, grain silos, paint spray booths).

It acts as a central hub, taking a large incoming power feed and splitting it into several smaller, protected circuits to power motors, lighting, instrumentation, and other equipment in the hazardous area.

Breakdown of the Model Number

Manufacturers use codes to specify key features. While conventions can vary slightly, here is the most logical interpretation:

HRMD91: This is likely the series or base model number from the manufacturer (e.g., a specific company's product line for explosion-proof distribution panels). It defines the overall enclosure style, internal layout, and certification standards it's built to (e.g., ATEX, IECEx, or specific national standards).

250A: This clearly denotes the main incoming current rating. The panel is designed to handle a maximum continuous current of 250 Amps on its primary input feeder.

6L: This indicates the number of outgoing circuits (loads).

6 = Six individual output circuits.

L = Likely stands for "Line" or "Circuit." Each circuit will have its own protective device (e.g., a circuit breaker or fuse).

VI: This is a critical designation for the corrosion protection level of the enclosure, based on the Ingress Protection (IP) Code (IEC standard 60529) and/or NEMA (National Electrical Manufacturers Association) standards.

In the IP Code (e.g., IP66), the second digit refers to protection against moisture. A '6' means "Powerful water jets" or "Strong seas." It is dust-tight (the first digit '6').

More specifically, "VI" often aligns with a NEMA Type rating. NEMA Type 4X is for indoor/outdoor use providing protection against corrosion, windblown dust and rain, splashing water, and hose-directed water. The "X" denotes corrosion resistance. "VI" is a common shorthand for this high level of environmental and corrosion protection, meaning the enclosure is made from a corrosion-resistant material like stainless steel (SS 304 or SS 316L is very common) or fiberglass.

Key Features and Components (What's Inside)

Explosion-Proof Enclosure: The housing is not just strong; it's engineered to contain any explosion that might occur inside (from a spark igniting ambient gas) preventing it from propagating to the outside hazardous atmosphere. It features:

Flame Paths: Precisely machined gaps between the lid and the body that cool escaping gases below the ignition temperature.

Robust Construction: Made of heavy-duty, corrosion-resistant materials (e.g., stainless steel, cast aluminum alloy with special coating).

Certified Seals: For all cable entries (conduit entries or cable glands) to maintain the explosion-proof integrity.

Internal Electrical Components:

Main Disconnect Switch or Circuit Breaker: A 250A device to isolate the entire panel.

6 Branch Circuit Breakers or Fuses: Individual protection for each of the 6 output circuits (e.g., you might have several 20A and 30A breakers).

Busbars: Robust copper bars that distribute power from the main input to the individual breakers.

Terminal Blocks: For connecting incoming and outgoing wiring.

Optional: Pilot lights (behind explosion-proof windows), voltmeters, ammeters, and control relays.