MTL5525 Solenoid Driver – SIL2/SIL3

MTL5525 Solenoid Alarm Driver for Hazardous Areas

Product Introduction

The MTL5525 solenoid/alarm driver is a reliable interface between safe-area controls and field devices in explosive atmospheres. It drives solenoids, alarms, or other low-power loads. This model features galvanic isolation of 250V rms, ensuring safety in Zone 0 environments. In addition, the MTL5525 includes a manual override switch for on-site testing or emergency actions. Its low power consumption makes it suitable for remote or temperature-sensitive locations. Engineers often choose this driver for SIL2 and SIL3 loops due to its certified performance.

Technical Specifications

Input and Power Requirements

The MTL5525 operates from a 20-35 Vdc power supply. Typical current consumption sits at 100mA when using 24 Vdc. Meanwhile, the built-in current limit is 48mA minimum, protecting the load from overcurrent conditions.

Output Characteristics

Minimum output voltage reaches 7.8V at 48mA. Maximum output voltage equals 24V from a 300Ω load. The response time stays within 100ms for the output to settle within 10% of its final value. Ripple measures below 0.5% peak-to-peak, ensuring clean switching signals.

Isolation and Safety

Galvanic isolation stands at 250V rms between safe-area circuits and the power supply. This device carries IECEx/ATEX approval for Zone 0 hazardous locations. Furthermore, it meets SIL2 and SIL3 requirements according to IEC61508. The EMC compliance follows EN61326.

Mechanical and Environmental Data

Mount the MTL5525 on a standard 35mm DIN rail (T-section). Its dimensions are 109.8 mm deep, 118.8 mm high, and 15.8 mm wide. The unit weighs only 150g. Ambient operating temperatures range from -20°C to 60°C. Storage allows -40°C to 80°C. Humidity tolerance spans 5% to 95% relative humidity, non-condensing.

LED Indication and Override

A green LED confirms power is present. A yellow LED shows the output status. Additionally, a manual override switch lets users force the output on or off without changing the input signal. This feature simplifies loop checks and maintenance.

Power Dissipation and Connection Details

Power dissipation measures 1.3W with a typical solenoid valve when the output is on. Worst-case dissipation reaches 1.9W. The electrical connection uses crimp ferrules. Terminal capacity accepts conductors up to 2.5mm², either stranded or single-core. Therefore, wiring is straightforward and secure.

Installation Guide

Follow these steps to install the MTL5525 correctly:

1. Mount the DIN rail – Use a 35mm T-section rail. Ensure the rail is properly grounded.

2. Clip the unit onto the rail – Tilt the top hook onto the rail, then press the bottom until it clicks.

3. Wire the power supply – Connect 20-35 Vdc to the designated terminals. Observe polarity.

4. Connect the field device – Wire the solenoid or alarm to the output terminals. Do not exceed the 48mA current limit.

5. Apply the override switch – Test the output manually before connecting the control signal.

6. Check LED indicators – Green means power is on. Yellow follows the output state.

For safe use in hazardous areas, always follow local wiring codes and the device’s IECEx/ATEX certificate conditions.

Packaging List

• MTL5525 solenoid/alarm driver unit – 1 piece

• Product label with model and certifications – pre-installed

• Terminal crimp ferrules – 4 pieces

• Quick start guide (diagram only) – 1 sheet

Note: No certificates or warranty documents are included.

Shipping Methods

We ship worldwide using FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours after dispatch.

Frequently Asked Questions (FAQ)

1. Can the MTL5525 drive a horn or strobe light?
Yes, it works as an alarm driver for horns or strobes. Ensure the load draws no more than 48mA minimum current limit to trigger correctly.

2. What happens if I connect a load over 48mA?
The internal current limit protects the circuit. The MTL5525 will restrict output current to around 48mA, so a higher-current device may not operate fully.

3. Does the override switch work when power is off?
No, the override requires power to function. It switches the output state but does not generate power from nothing.

4. Can I mount this driver next to high-power AC lines?
Yes, but keep a safe distance. The 250V rms isolation provides good protection, though you should follow standard panel wiring practices to reduce interference.

5. How do I confirm my unit is SIL3 ready?
Check the side label for the IEC61508 mark. All MTL5525 units from Eaton meet SIL2 and SIL3 requirements when used in a certified safety loop.