Warom HRMD91-250A-8L Explosion Proof Industrial Power Distribution Panel

HRMD91-250A-8L(63A*4+32A*4): Likely indicates main incoming current 250A with 8 outgoing circuits (comprising 4 circuits at 63A and 4 circuits at 32A).

The HRMD91-250A-8L Explosion Proof Industrial Power Distribution Panel is a very common and versatile workhorse in hazardous industrial environments. It strikes a balance between capacity and number of circuits, making it suitable for a wide range of applications.

Let's break down its specifications and implications.

Overall Purpose

This is a 250-Amp Explosion-Proof Distribution Panel with 8 output circuits. Its primary function is to safely receive a medium-to-large incoming power feed and distribute it to eight separate pieces of equipment or sub-circuits within a classified hazardous area (where flammable gases, vapors, or dusts are present).

Breakdown of the Model Number

HRMD91: This is the manufacturer's base series or model number. It identifies the product family and confirms the design and construction meet the required explosion-proof standards (like IECEx, ATEX, or specific national standards).

250A: The main incoming current rating. This panel is designed to handle a maximum continuous current of 250 Amps on its primary input feeder. This is a substantial amount of power, capable of running several large motors, a significant amount of lighting, and process instrumentation.

8L: This indicates the number of outgoing circuits.

8 = Eight individual output circuits.

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

Key Features and Design

Explosion-Proof Enclosure: The housing is engineered to contain any internal explosion, preventing it from igniting the surrounding atmosphere. It features:

Flame Paths: Precision gaps between the cover and body that cool expanding gases.

Robust Construction: Typically made from cast aluminum alloy or steel, often with a corrosion-resistant coating.

Certified Conduit Openings: Threaded holes for explosion-proof cable glands or conduit entries to maintain the seal.

Internal Components:

Main Disconnect: A 250A switch-disconnector or circuit breaker to isolate the entire panel.

Busbars: Copper bars that distribute power from the main input to the eight individual circuit protection devices.

8 Branch Protection Devices: These could be fuses (in fuse holders) or Miniature Circuit Breakers (MCBs). The model number doesn't specify which, meaning this is a base configuration. The choice between fuses and MCBs would be a critical selection during the ordering process.

Terminal Blocks: For connecting incoming and outgoing wiring.

The Missing Suffixes: Important Implications

You'll notice this model number lacks suffixes like -MCB, -SS, or -ExdIICT6. This is highly significant:

-MCB is absent: This means the branch protection is not specified. It could be supplied with either fuses or circuit breakers. This would be a key point to clarify when ordering. A fuse-based panel is cheaper; an MCB-based panel offers easier resetting and switching.

Corrosion/Material suffix (e.g., -VI or -SS) is absent: The standard enclosure material is likely painted cast aluminum or steel, offering basic environmental protection. For corrosive environments (marine, chemical splashes), you would need to explicitly specify a material like Stainless Steel (SS).

Explosion Rating suffix (e.g., -ExdIICT6) is absent: The panel will have a default explosion protection rating, but for use in areas with the most easily ignited gases (Hydrogen, Acetylene) or where high surface temperatures are a concern, you must explicitly specify the required certification (e.g., ExdIICT6).

In essence, HRMD91-250A-8L is a base model. The complete specification for a real purchase order would need to include these options, e.g., HRMD91-250A-8L-MCB-SS-ExdIICT6.