MTL 4546C Fieldbus Module | Power Supply, H1 Repeater, IS, 24V DC, 3.0A, DIN Rail Specs

MTL 4546C Fieldbus Module | Power Supply, H1 Repeater, IS, 24V DC, 3.0A, DIN Rail Specs

MTL 4546C fieldbus power and communications module specifications. Fieldbus H1 repeater, 24V DC, 3.0A, IS barrier, diagnostics, FM/ATEX/IECEx. For high-power hazardous area networks.

Product Overview

The MTL 4546C​ is a high-capacity fieldbus power and communications module​ from MTL's 4500 series, designed as a FOUNDATION Fieldbus H1 repeater with intrinsic safety protection. This model provides regulated 24V DC power​ with 3.0A capacity​ (shared between two segments), includes advanced diagnostic capabilities, and carries FM, ATEX, and IECEx approvals​ for Zone 1 hazardous locations. The "4546C" designation identifies this specific high-current configuration in the 454x product family. This device supports larger fieldbus networks with more devices or longer cable runs, combining power supply, signal conditioning, and diagnostic functions for demanding industrial applications.

Technical Specifications

Note: Specifications are based on MTL 4546C technical documentation. The "C" suffix may indicate a specific configuration or approval variant. The 3.0A capacity is shared between the two segments. Always verify with the latest product datasheet.

Key Features

• High Current Capacity:​ 3.0A total output for powering larger fieldbus networks

• Shared Current Pool:​ Flexible allocation of current between two segments (up to 3.0A total)

• Intrinsic Safety Barrier:​ Provides IS protection for Zone 1 hazardous areas

• Adjustable Current Limit:​ Field-adjustable from 0.5A to 3.0A total shared current

• Dual Segment Support:​ Powers and conditions two independent fieldbus segments

• Universal Input:​ Accepts 85-264V AC or 20-30V DC input

• Built-in Termination:​ Switchable 100Ω termination for each segment

• Advanced Diagnostics:​ Real-time monitoring of voltage and current on each segment

• Enhanced Heat Dissipation:​ Larger housing for better thermal management at high loads

• SIL 2 Capable:​ Suitable for safety instrumented systems (when properly configured)

Power Distribution Options

Note: Current distribution is configurable, with 3.0A maximum total shared current.

Entity Parameters (for Hazardous Area Design)

Note: The 4546C is an associated apparatus. All connected field devices must be intrinsically safe and properly certified.

LED Status Indicators

Typical Applications

• Large Process Plants:​ Fieldbus networks in refineries, petrochemical complexes with many field devices

• Power Generation:​ Extensive fieldbus networks for turbine halls, boiler plants, and auxiliary systems

• Offshore Platforms:​ Comprehensive fieldbus systems covering production areas, utilities, and safety systems

• Mining Operations:​ Large underground fieldbus networks for process control and monitoring

• Water Treatment Facilities:​ Extensive fieldbus instrumentation networks in large treatment plants

• Any FOUNDATION Fieldbus H1 application​ requiring high current capacity for multiple devices or long cable runs

Important Technical Notes

1. Current Sharing Configuration:​ The 3.0A capacity is shared between segments. Properly configure current limits for each segment based on actual device requirements.

2. Thermal Management:​ The 4546C generates more heat than lower-current models. Ensure adequate ventilation and do not exceed the 60°C maximum ambient temperature, especially at full load.

3. Certification Compliance:​ Verify that the 4546C's hazardous area certifications match your installation's zone classification (Zone 1, IIC, T6 typically).

4. Power Budgeting:​ With 3.0A capacity, careful power budgeting is essential. Calculate voltage drops and current requirements for all devices on both segments.

5. Input Power Requirements:​ The higher current output requires more input power. Ensure the input power source can provide up to 120 VA.

6. Grounding Requirements:​ Follow manufacturer's grounding instructions precisely. High-current applications require proper grounding for safety and performance.

7. Cable Sizing:​ For high-current segments, ensure proper cable sizing to minimize voltage drop over long runs.

8. Diagnostic Monitoring:​ Use the LED indicators and optional RS-485 interface to monitor segment health, especially important for high-availability applications.

9. Segment Independence:​ While current is shared, the two segments are electrically isolated. This allows mixing of device types and separate network management.

10. Physical Size:​ The 4546C is wider (105mm) than the 4544 (70mm) to accommodate larger components and heat sinking. Plan panel space accordingly.

Note: This data sheet provides general specifications for the MTL 4546C high-capacity fieldbus power and communications module. For complete installation guidelines, current sharing configuration procedures, network design calculations, and safety instructions, consult the official MTL 4500 Series Technical Manual. Always verify that the product configuration matches your specific hazardous area and application requirements.