The MTL5522 solenoid/alarm driver is a loop-powered interface between safe-area controls and field devices in explosive atmospheres. It drives solenoids, horns, strobes, or other alarm devices. Unlike externally powered models, this unit draws its operating power directly from the input loop. This feature simplifies installation and reduces cabinet space. In addition, the MTL5522 provides galvanic isolation of 250V rms, ensuring safety in Zone 0 environments. Engineers choose this driver for SIL1 and SIL3 applications where loop power is preferred.
The MTL5522 operates from a 20-35 Vdc power supply. Maximum input voltage matches the supply range. Typical current consumption sits at 125mA when using 24 Vdc. Meanwhile, the built-in current limit is 70mA minimum, protecting the load from overcurrent conditions. This loop-powered design means no separate power wiring is needed for the output side.
Minimum output voltage reaches 10.7V at 70mA. Maximum output voltage equals 24V from a 158Ω 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 for sensitive alarm devices.
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 SIL1 and SIL3 requirements according to IEC61508. The EMC compliance follows EN61326. The MTL5522 is rated for IIB gas groups, making it suitable for many industrial environments.
Mount the MTL5522 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.
Power dissipation measures 1.4W at 24V. This low value keeps the unit cool even in densely packed cabinets. 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. As a loop-powered device, the MTL5522 requires only two wires for both power and signal.
A single yellow LED shows the output status. When the LED is on, the output is active. When off, the output is inactive. This simple indication helps maintenance staff verify operation quickly. Note that there is no separate power LED because the MTL5522 is loop-powered.
The MTL5522 differs from the MTL5525 in several ways. First, the MTL5522 is loop-powered while the MTL5525 requires separate power. Second, current limit is 70mA on the MTL5522 versus 48mA on the MTL5525. Third, the MTL5522 lacks a manual override switch. Fourth, SIL rating is SIL1/SIL3 compared to SIL2/SIL3. Choose the MTL5522 when loop power is available and a higher current limit is needed.
Follow these steps to install the MTL5522 correctly:
Mount the DIN rail – Use a 35mm T-section rail. Ensure the rail is properly grounded.
Clip the unit onto the rail – Tilt the top hook onto the rail, then press the bottom until it clicks.
Wire the loop power – Connect the 20-35 Vdc supply through the control switch or PLC output.
Connect the field device – Wire the solenoid or alarm to the output terminals. Do not exceed the 70mA current limit.
Test the loop – Apply power and verify the yellow LED responds to the input signal.
For safe use in hazardous areas, always follow local wiring codes and the device's IECEx/ATEX certificate conditions.
MTL5522 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.
We ship worldwide using FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours after dispatch.
1. Can the MTL5522 drive a 24V DC solenoid directly?
Yes, as long as the solenoid draws no more than 70mA. The minimum output voltage of 10.7V at 70mA means some solenoids may see reduced voltage. Check your solenoid's specifications before connecting.
2. What is the difference between MTL5522 and MTL5525?
The MTL5522 is loop-powered with a 70mA current limit and no override switch. The MTL5525 requires external power with a 48mA limit and includes a manual override. Choose based on your power availability and current needs.
3. Does this driver work with SIL3 loops?
Yes, the MTL5522 meets SIL3 requirements according to IEC61508. However, it also carries a SIL1 rating. For SIL3 applications, consult the safety manual for proper configuration.
4. Why is there no green power LED?
The MTL5522 is loop-powered. The yellow status LED serves as the only indicator. If the yellow LED does not light when the input is active, check your loop power and wiring.
5. Can I use this with a horn in Zone 0?
Yes, the MTL5522 is approved for Zone 0 hazardous locations. Ensure the horn is also rated for Zone 0 and draws less than 70mA. The response time of 100ms is fast enough for most alarm applications.
| Brand Name | MTL |
| Model No. | MTL5522 |
| Product Type | Solenoid/Alarm Driver |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
