MTL 5573 Digital Input Isolator | DI, 24V DC, Contact, IS, DIN Rail, FM/ATEX Specs

MTL 5573 Digital Input Isolator | DI, 24V DC, Contact, IS, DIN Rail, FM/ATEX Specs

MTL 5573 digital input isolator specifications. 24V DC, contact input, relay output, intrinsic safety, 2 channels. FM/ATEX/IECEx approved for hazardous areas.

Product Overview

The MTL 5573​ is a dual-channel digital input isolator​ from MTL's 5000 series, designed to interface 24V DC contact signals​ from hazardous areas and provide isolated relay outputs. This device provides intrinsic safety protection​ for two digital input channels, converts field contact status to relay switching functions, and carries FM, ATEX, and IECEx approvals​ for Zone 1 hazardous locations. The "5573" designation identifies this specific model configured for digital input isolation. This unit provides reliable interface for switch contacts, proximity sensors, and other digital field devices in explosive atmospheres.

Technical Specifications

Note: Specifications are based on MTL 5000 series documentation. The 5573 provides two independent digital input channels with relay outputs. Always verify with the latest product datasheet.

Key Features

• Dual-Channel Design:​ Two independent, galvanically isolated digital input channels

• Input Flexibility:​ Accepts dry contacts or active 24V DC signals

• Relay Outputs:​ Two Form A relay contacts (one per channel)

• Fast Response:​ < 10 ms response time for quick status detection

• Intrinsic Safety:​ Approved for Zone 1 hazardous locations

• LED Status Indicators:​ Visual indication of input status

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

• Wide Voltage Range:​ 17-30V DC input compatibility

• High Isolation:​ 500V AC isolation between all circuits

• Global Approvals:​ Certified for international hazardous area applications

Input Types and Configurations

Relay Contact Ratings

Entity Parameters (for Hazardous Area Design)

Note: The 5573 is an associated apparatus. Connected field devices in the hazardous area must be certified as intrinsically safe or be simple apparatus.

Typical Wiring Configurations

Typical Applications

• Limit Switch Monitoring:​ Position indication for valves, doors, gates

• Level Switch Interface:​ High/low level alarms from float switches

• Pressure Switch Monitoring:​ Pressure alarms and interlocks

• Flow Switch Interface:​ Flow/no-flow detection

• Proximity Sensor Interface:​ Object detection in hazardous areas

• Emergency Stop Circuits:​ Safety interlock monitoring

• Door/Guard Monitoring:​ Safety gate and access door status

• Motor Running Feedback:​ Motor contactor auxiliary contact monitoring

• Any application requiring​ digital status monitoring from Zone 1 hazardous areas

Important Technical Notes

1. Field Device Certification:​ Field switches and sensors in the hazardous area must be certified as intrinsically safe or qualify as "simple apparatus."

2. Wetting Current:​ For dry contacts, ensure at least 1 mA flows through the contact to break through oxidation. Use an external resistor if needed.

3. Contact Bounce:​ The 5573 has internal filtering for contact bounce. Typical debounce time is 5-10 ms.

4. Active Inputs:​ For active 24V DC inputs, ensure the sourcing device can provide 2-4 mA at 17-30V DC.

5. Relay Load Ratings:​ Do not exceed relay contact ratings. For inductive loads, use appropriate suppression (RC networks, diodes, varistors).

6. Power Supply:​ Use a certified intrinsically safe power supply or ensure the power supply meets IS requirements for the entire circuit.

7. Wiring Practices:​ Use twisted pair cables for noise immunity. Maintain separation between intrinsically safe and non-intrinsically safe wiring (minimum 50mm).

8. LED Indicators:​ Green LED illuminates when the corresponding input is active (contact closed or 24V present).

9. Certification Compliance:​ Verify that the 5573's certifications match the hazardous area classification and temperature rating of your application.

10. Testing:​ Regularly test input functions to ensure proper operation. Document wiring and test results for maintenance records.

Note: This data sheet provides general specifications for the MTL 5573 digital input isolator. For complete installation guidelines, wiring diagrams, and safety instructions, consult the official MTL 5000 Series Technical Manual. Always verify that the product configuration and certifications match your specific application requirements.