MTL 4576 HART Isolator | 2-Wire, 1-Channel, IS, 24V DC, DIN Rail, ATEX/IECEx Specs

MTL 4576 HART Isolator | 2-Wire, 1-Channel, IS, 24V DC, DIN Rail, ATEX/IECEx Specs

MTL 4576 HART isolator specifications. Single-channel, 2-wire, passive isolator, 4-20mA with HART, 24V DC. ATEX/IECEx approved for hazardous areas.

Product Overview

The MTL 4576​ is a single-channel HART isolator and barrier​ from MTL's 4500 series, designed to provide intrinsic safety, galvanic isolation, and signal conditioning​ for 4-20mA with HART communication​ signals between a safe-area control system​ and a hazardous-area 2-wire field transmitter. This passive device provides 1500V AC isolation, ensures HART signal transparency, and carries ATEX and IECEx approvals​ for Zone 1 hazardous area installations. The 4576 protects both equipment and personnel in hazardous locations.

Technical Specifications

Note: Specifications are based on MTL 4500 series documentation. The 4576 is a passive, loop-powered device. Always verify with the latest product datasheet.

Key Features

• HART Signal Transparency:​ Full HART digital communication capability with no degradation

• Galvanic Isolation:​ 1500V AC isolation between input, output, and ground

• Intrinsic Safety:​ Approved for Zone 0/1 hazardous locations

• Passive Operation:​ No separate power supply required (loop-powered)

• Compact Design:​ Only 12.5mm wide for high-density installations

• High Accuracy:​ ±0.1% of span ensures precise signal transmission

• Fast Response:​ <1 ms for real-time process control

• Low Voltage Drop:​ Only 4V typical minimizes power supply requirements

• SIL 2 Capable:​ Suitable for safety instrumented systems

• Global Approvals:​ Certified for international hazardous area applications

Electrical Characteristics

Entity Parameters (for Hazardous Area Design)

Note: The 4576 is an associated apparatus. Connected field transmitters in the hazardous area must be intrinsically safe certified and their entity parameters must satisfy: Uo ≥ Ui, Io ≥ Ii, Po ≥ Pi, Lo ≥ Li, Co ≥ Ci.

Wiring Configuration

[Safe Area]
Power Supply/PLC ---[4-20mA + HART]---> MTL 4576 Input
                                                      |
[Hazardous Area]                                     |
Field Transmitter <---[4-20mA + HART]--- MTL 4576 Output

LED Status Indicator

Typical Applications

• 2-Wire Transmitters:​ Pressure, temperature, level, flow transmitters with HART

• Hazardous Area Instrumentation:​ Any 4-20mA HART device in Zone 0/1 areas

• Process Control Loops:​ Isolating control system from field devices

• Ground Loop Elimination:​ Breaking ground loops between safe and hazardous areas

• Signal Conditioning:​ Protecting control systems from field-side transients

• Retrofit Projects:​ Adding HART capability to existing 4-20mA loops

• SIS Applications:​ Safety instrumented systems requiring SIL 2 isolation

• Multi-Vendor Systems:​ Interfacing different manufacturer equipment

Important Technical Notes

1. Loop Power Calculation:​ The 4576 is loop-powered. Verify: V_supply ≥ (V_transmitter_min + V_barrier + I_loop × R_load). Minimum supply voltage is typically 15V DC.

2. Voltage Drop:​ The 4576 has 4V typical voltage drop. This must be included in loop voltage calculations.

3. Load Resistance:​ Maximum load on input side is 300Ω (including cable resistance). Calculate: R_load = (V_supply - V_transmitter - V_barrier) / I_loop.

4. HART Compatibility:​ The 4576 is fully HART transparent. No special configuration required for HART communication.

5. Wiring Practices:​ Follow manufacturer's wiring guidelines. Maintain separation between IS and non-IS wiring.

6. Certification Compliance:​ Verify that the 4576's certifications (Zone 0, IIC, T6) match your hazardous area classification.

7. Grounding:​ Proper grounding is essential. Follow the grounding instructions in the installation manual.

8. Temperature Rating:​ The T6 temperature rating (85°C) applies to the hazardous area side.

9. SIL Applications:​ For SIL 2 use, follow all manufacturer guidelines for proof testing and maintenance intervals.

10. Spare Capacity:​ When designing systems, include spare isolators for future expansion (typical 20% spare).

Note: This data sheet provides general specifications for the MTL 4576 HART isolator/barrier. For complete installation guidelines, loop calculations, wiring diagrams, SIL documentation, and safety instructions, consult the official MTL 4500 Series Technical Manual. Always verify that the product configuration and certifications match your specific application requirements and perform loop calculations to ensure proper operation.

More Products

Pepperl Fuchs Safety Barrier

Allen Bradley PLC Controllers

SICK Instruments 

Festo Cylinder 

IFM Sensors 

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

Are preferential prices available?

Long-term brand partners can get competitive product prices. At the same time, ACH controls the profit per order to 5%, providing the most competitive prices.

Are the Products Genuine OEM Units?

Yes, all products from ACH are certified genuine OEM units. We acquire our inventory through official OEM channels and trusted third-party suppliers, ensuring every item is authentic and reliable.

How will you arrange shipment?

We'll handle the shipping for you. Through our partnerships, we can secure competitive rates with major carriers like FedEx, DHL, TNT, and UPS, ensuring a smooth and cost-effective delivery.

What is the warranty of goods?

One-year Warranty.

How long is the logistics cycle of the product?

Products are divided into spot and futures, and the delivery period of different brands of products is also different. For details, please contact the ACH business manager.