Honeywell MTL4599N General Purpose Feed-Through Module

Functional Overview

The MTL4599N is a passive feed-through terminal module manufactured by Honeywell MTL Instruments for use with MTL4500 and MTL5500 system backplanes. It provides a structured and compliant method for routing non-intrinsically safe or spare field conductors through the backplane without introducing signal isolation or conditioning.

This module is intended for installations where clean termination and clear segregation of IS and non-IS circuits are required to maintain system integrity and regulatory compliance.

Operational Purpose

The MTL4599N does not perform signal conversion or isolation. Instead, it serves as a mechanical and electrical interface that connects field wiring to the backplane connector, allowing unused cores or non-IS circuits to be terminated in an organized and accessible manner.

By allocating a defined termination point, the module helps reduce wiring congestion and minimizes the risk of accidental cross-connection within mixed-signal assemblies.

Electrical and Mechanical Characteristics

• Model: MTL4599N
• Manufacturer: Honeywell MTL Instruments
• Module Type: Passive feed-through termination
• Backplane Compatibility: MTL4500, MTL5500 series
• Terminal Count: Six screw terminals
• Internal Connection: Direct link to backplane multiway connector
• Maximum Signal Rating: ≤ 50 V, ≤ 0.25 A
• Isolation Function: None (feed-through only)
• Mounting Method: Backplane slot installation
• ​Weight: 60 g

Packaged shipping weight may vary depending on distributor handling and logistics.

Installation and Integration

The module installs directly into a designated backplane position and interfaces mechanically with the system connector. Field conductors are secured via top-mounted screw terminals, providing clear visibility and straightforward maintenance access during commissioning or modification.

Its compact footprint allows it to be installed alongside isolators, signal conditioners, and surge protectors within the same backplane assembly.

Application Scenarios

The MTL4599N is commonly used in:

• Hazardous area control cabinets
• Instrumentation marshalling panels
• Systems requiring mixed IS and non-IS wiring
• Installations with spare field cable cores

It is particularly valuable during phased expansions or retrofits, where unused conductors must remain safely terminated until future use.

Compliance and Safety Considerations

While the module itself does not provide intrinsic safety protection, its terminal design and layout support proper segregation practices in accordance with IS installation standards. This allows IS and non-IS circuits to coexist on the same backplane without compromising system compliance when used correctly.

Related Modules

For applications requiring signal isolation or conditioning, Honeywell MTL offers dedicated isolator modules within the MTL4500 and MTL5500 series. The MTL4599N is used strictly for routing and termination and should not be substituted for isolator functions.

FAQ

Q: Does the MTL4599N provide intrinsic safety isolation? A: No. This module is a passive feed-through device and does not isolate or condition signals.

Q: Can IS and non-IS wiring be installed on the same backplane? A: Yes, when installed correctly, the module supports compliant separation between IS and non-IS circuits.

Q: What is the maximum allowed signal rating? A: The module must not be used with signals exceeding 50 V or 0.25 A.