MTL 4521 Dual Channel Fieldbus Supply | 2x 350mA, IS, DIN Rail, ATEX/IECEx/FM Specs

MTL 4521 Dual Channel Fieldbus Supply | 2x 350mA, IS, DIN Rail, ATEX/IECEx/FM Specs

MTL 4521 dual-channel fieldbus power supply specifications. Two independent H1/PA segments, 350mA each, 24V DC, DIN rail. ATEX/IECEx/FM approved for hazardous areas.

Product Overview

The MTL 4521​ is a dual-channel fieldbus power supply and conditioner​ from MTL's 4500 series, designed to provide regulated power and signal conditioning​ for two independent FOUNDATION Fieldbus H1 or PROFIBUS PA segments. Each channel delivers 350 mA of fieldbus power, provides short-circuit protection, includes independently switchable termination, and carries ATEX, IECEx, and FM approvals​ for Zone 1 hazardous area installations. The 4521 provides a space-efficient solution for powering two separate fieldbus networks from a single unit.

Technical Specifications

Note: Specifications are based on MTL 4500 series documentation. The 4521 provides two completely independent 350mA channels in a compact housing. Always verify with the latest product datasheet.

Key Features

• Dual Independent Channels:​ Two completely isolated 350mA fieldbus segments in one unit

• Space Efficiency:​ Saves panel space compared to two single-channel units

• Independent Termination Control:​ Separate switches for each channel's 100Ω termination

• Independent Fault Protection:​ Short-circuit and overload protection per channel

• Intrinsic Safety:​ Approved for Zone 1 hazardous locations

• LED Status per Channel:​ Individual power, communication, and fault indicators for each segment

• Global Approvals:​ Certified for international hazardous area applications

• No Configuration Required:​ Plug-and-play operation

• Channel Isolation:​ Prevents cross-talk and fault propagation between segments

• Cost-Effective:​ Lower cost per channel than single units

Electrical Characteristics (per channel)

LED Status Indicators (per channel)

Entity Parameters (for Hazardous Area Design, per channel)

Note: The 4521 is an associated apparatus. Each channel's connected fieldbus devices must be intrinsically safe certified.

Typical Applications

• Multi-Segment Control Systems:​ Powering two separate fieldbus segments from one location

• Redundant Systems:​ Independent power for redundant fieldbus networks

• Process Units with Multiple Loops:​ Separating control loops for different process areas

• Backup Power Distribution:​ Primary and backup segments in critical applications

• Panel Space Optimization:​ Where rack space is limited

• Cost-Sensitive Multi-Segment Installations:​ Reducing per-channel cost

• Batch Process Sequencing:​ Independent control of different batch stages

• Safety and Control Separation:​ Separate segments for safety and basic process control systems

Important Technical Notes

1. Power Supply Requirements:​ Requires a robust 20-30V DC input. Recommended: 24V DC, 2A capacity to support both channels at full load (500mA combined maximum).

2. Current Sharing:​ The 500mA combined maximum means both channels cannot run at full 350mA simultaneously. Maximum combined load is 500mA (e.g., 250mA per channel).

3. Independent Operation:​ Channels are electrically isolated. A fault on one channel does not affect the other.

4. Termination Settings:​ Each channel's termination must be set independently based on segment topology. Typically, only one terminator per segment end.

5. Wiring Separation:​ Maintain separation between fieldbus cables of different segments, especially in cable trays.

6. Thermal Considerations:​ The 4521 may generate significant heat with both channels near maximum. Ensure adequate ventilation and derate at high ambient temperatures.

7. Grounding:​ Follow manufacturer's grounding instructions. Fieldbus shields should typically be grounded at the power supply end only.

8. Certification Compliance:​ Verify certifications match hazardous area classification. Each channel has its own entity parameters for IS calculations.

9. LED Diagnostics:​ Individual channel LEDs simplify troubleshooting. Red FAULT on one channel only affects that segment.

10. Segment Design:​ Design each segment independently according to fieldbus rules (max 32 devices, 1900m trunk, etc.).

Note: This data sheet provides general specifications for the MTL 4521 dual-channel fieldbus power supply. For complete installation guidelines, wiring diagrams, network design rules, and safety instructions, consult the official MTL 4500 Series Technical Manual. Always verify that the product configuration and certifications match your specific application requirements.

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About ACH

Founded in 2012, ACH is a top-tier distributor of industrial automation products, supplying genuine devices from leading brands like ABB, P+F, E&H, AB, MTL and EMERSON to emerging markets worldwide. Our mission is to provide 100% Genuine products at the most competitive prices, helping customers reduce costs and strengthen their market position.

Frequently Ask & Questions

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One-year Warranty.

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