Metso D100644 Fuses terminals / Distribution board

The Metso D100644 is a specialized power distribution and protection component, specifically a Fuse Terminal/Distribution Board used within the Metso DNA and maxDNA Distributed Control System (DCS) cabinets.

1. Introduction

The D100644 serves as a critical infrastructure piece for I/O power management.

Its primary role is to distribute 24V DC or 48V DC power from the system power supplies to individual field instruments and I/O modules.

It features integrated fuse protection for each branch circuit, ensuring that a short circuit in a single field device (like a transmitter or solenoid) does not cause a total power failure across the entire control rack.

2. Technical Parameter Table

3. Related Models

The D100644 is part of the cabinet power distribution family:

D100645: A variant of the distribution board, often with different circuit counts or grounding.

PSM303: The Power Supply Module that feeds the D100644.

IOT300A: The I/O base unit that receives power from these distribution boards.

CPO series: Connection poles that interface with the power distribution network.

4. Application Cases

Field Instrument Powering: Providing fused 24V DC power to 2-wire and 4-wire transmitters (Pressure, Flow, Level).

Output Loop Protection: Protecting the output channels of modules like the IOP320 or IOP351 from external electrical faults.

Cabinet Internal Power: Distributing power to cooling fans, network switches, and cabinet lighting within the DCS enclosure.

Redundant Power Schemes: Used in pairs to distribute power from redundant (A and B) power supply buses to critical I/O.

5. Product Advantages and Features

Individual Circuit Isolation: Each channel is fused, providing “selective coordination”—only the faulty circuit is disconnected during a failure.

Visual Troubleshooting: Most revisions include an LED for each fuse. If a fuse blows, the LED lights up (or turns off), allowing technicians to identify the problem instantly without testing every terminal.

Rugged Connectivity: Designed for heavy-duty industrial wiring; the terminals can accommodate thick-gauge wires required for long-distance power runs.

Compact Footprint: Consolidates power distribution into a single board, replacing rows of individual fuse blocks and reducing cabinet clutter.

6. Other Models in the Same Series

This component belongs to the Metso/Valmet DNA Cabinet Infrastructure:

D100xxx Series: A wide range of power filters, distribution blocks, and grounding bars.

ACN RT / ACN MR: Modern controllers that rely on this power infrastructure.

IOP3xx Series: The standard input/output modules powered by this board.