Warom HRMD91-400A-12L-MCB Explosion Proof Industrial Power Distribution Panel

HRMD91-400A-12L-MCB: Likely indicates main incoming current 400A with 12 outgoing circuits using Miniature Circuit Breakers (MCBs).

 The HRMD91-400A-12L-MCB Explosion Proof Industrial Power Distribution Panel introduces a crucial new specification that defines the type of protection used on the branch circuits.

This model is a high-capacity panel designed for flexible and safe operation in hazardous areas, with a key feature making maintenance safer and faster.

Breakdown of the Model Number

HRMD91: The manufacturer's base series or model number, indicating it belongs to the same family of explosion-proof panels.

400A: The main incoming current rating. The panel is designed for a maximum continuous current of 400 Amps on its primary input feeder.

12L: Indicates the number of outgoing circuits.

12 = Twelve individual output circuits.

L = Stands for "Line" or "Circuit." This high number of circuits offers significant flexibility for powering a wide array of equipment from a single central point.

MCB: This is the most important part of the new specification. It stands for Miniature Circuit Breaker.

The Significance of "MCB"

The -MCB suffix tells us what is inside the panel protecting each of the 12 output circuits. This is a major differentiator from panels that might use fuses.

What it means:

Each of the 12 output circuits is protected by an individual, installed Miniature Circuit Breaker.

These are thermal-magnetic trip devices that provide both overload (thermal) and short-circuit (magnetic) protection.

Advantages of using MCBs over Fuses:

Ease of Resetting: This is the primary advantage. If a circuit trips due to a temporary overload, it can be reset immediately with the flip of a switch once the fault is cleared. There is no need to replace a fuse.

Operational Convenience: Provides a clear ON/OFF switch for each individual circuit, allowing for easy isolation of equipment for maintenance without needing to shut down the entire panel.

Consistency: Breakers have a defined trip curve and are less susceptible to degradation or tampering compared to fuses, which can be replaced with an incorrect type or rating.

Safety for Personnel: Resetting a breaker is generally safer and requires less manual dexterity than replacing a potentially hot fuse in a hazardous location.

Considerations of using MCBs:

Cost: MCB-based panels are typically more expensive upfront than functionally equivalent fuse-based panels.

Size: Individual breakers can take up more space than fuse holders, which can influence the overall size of the enclosure for a given number of circuits.

Overall Function and Design

This panel takes a large 400A feed and splits it into 12 individually protected and controlled circuits. The internal layout would include:

A Main 400A Disconnect: This could be a large switch-disconnector or a molded case circuit breaker (MCCB) to isolate the entire panel.

Main Busbars: Robust copper bars to distribute power from the main input to the 12 MCBs.

12 MCBs: These are the star of the show. They would be mounted on a DIN rail or a fixed mounting plate. Their ratings would vary based on the intended load (e.g., a mix of 16A, 20A, 32A, and 63A breakers).

Termination Areas: Large terminals for the incoming power and terminals for the 12 outgoing circuits.

The Missing Suffix: Material and Certification

Like the 630A model, this code lacks a suffix for material (-SS) and explosion rating (-ExdIICT6). This means:

HRMD91-400A-12L-MCB is the core functional description.

The enclosure material (e.g., cast aluminum, stainless steel -SS) and the explosion protection certification (e.g., ExdIICT6) are critical options that must be specified to complete the order. A full specification would be something like HRMD91-400A-12L-MCB-SS-ExdIICT6.