The MTL SD16X is a high-performance, low-resistance surge protection device (SPD) from Eaton's Crouse-Hinds MTL SD Series, specifically designed for 16V DC / 11V AC signal circuits requiring minimal series impedance. With an ultra-low series resistance of just 2.2 Ω per line and a wide bandwidth of 25MHz, the SD16X is the ideal solution for protecting sensitive instrumentation including thermocouple (THC) inputs, 4-20mA loops, emergency shutdown systems, and fire and gas detectors in industrial process control environments.

As part of the SDX series (low resistance version), this device delivers full hybrid surge protection without the additional fuse/disconnect feature found in standard SD models, making it the perfect choice for applications where low loop resistance is critical for measurement accuracy.

The SD16X is particularly well-suited for applications where the maximum working voltage of the system is up to 16V DC, providing optimal protection without compromising signal integrity.

Mounting Instructions

• Snap the SD16X onto standard 35mm top-hat DIN rail until it clicks securely into place
• Ensure proper grounding through the DIN rail (automatic when mounted on grounded rail)
• The ultra-slim footprint allows high-density side-by-side mounting

Wiring Instructions

The SD16X features two terminals for 2-wire loop protection:

• Terminal 1: Signal/power positive (+) from field side
• Terminal 2: Signal/power negative (-) from field side

Important Notes

• The device connects in series with the protected circuit
• Series resistance of 2.2Ω is added to the loop - suitable for most 4-20mA and thermocouple applications
• The device provides no fuse/disconnect feature (use SD16 if disconnect required)
• Follow local electrical codes for proper installation
• Compatible with both conventional and smart 4-20mA transmitters

• Eaton MTL Reliability: MTL is a globally recognized leader in intrinsic safety and surge protection for industrial process control.
• Industry-Leading Low Resistance with High Bandwidth: At just 2.2 Ω per line and 25MHz bandwidth, the SD16X offers optimal performance.
• Comprehensive Hazardous Area Approvals: With ATEX, IECEx, UL, CSA, and CCC Ex certifications for worldwide installation.
• 10-Year Warranty: Backed by Eaton MTL's industry-leading warranty for long-term reliability.
• Part of a Complete Protection System: Integrates seamlessly with the full MTL SD Series platform.

Reference Price: Approximately £150.00 per unit (subject to change)

Warranty: 10-year manufacturer's warranty

The MTL SD16X Surge Protector delivers reliable, high-performance protection for 16V DC/11V AC signal circuits, with special optimization for 4-20mA loops and thermocouple applications. With its ultra-low 2.2 Ω series resistance, 25MHz bandwidth, 20kA surge capacity, and comprehensive hazardous area certifications, the SD16X is the ideal choice for engineers seeking to protect sensitive instrumentation without compromising signal integrity.

Protect your 4-20mA loops and thermocouple circuits with MTL SD16X - the low-resistance, high-bandwidth surge protection solution for harsh and hazardous environments.