The MTL SD07X is a high-performance, low-resistance surge protection device (SPD) from Eaton's Crouse-Hinds MTL SD Series, specifically designed for low voltage signal circuits requiring minimal series impedance. With a nominal voltage rating of 7V DC / 5V AC and an ultra-low series resistance of just 2.2 Ω per line, the SD07X is the ideal solution for protecting sensitive 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, this device delivers full hybrid surge protection without the additional fuse/disconnect feature, making it the perfect choice for applications where low loop resistance is critical for measurement accuracy.

• Ultra-Low Series Resistance - 2.2Ω Per Line: Minimal 2.2 Ω series resistance per line ensures negligible impact on sensitive low-level signals, ideal for thermocouple and millivolt-level measurements.
• Optimized for Low Voltage Applications: Rated at 7V DC / 5V AC for protecting low-voltage signal circuits including thermocouple inputs, 4-20mA current loops, emergency shutdown systems, and fire and gas detection systems.
• Proven Hybrid Protection Circuitry: Advanced multistage hybrid technology combining gas discharge tubes, varistors, and transient voltage suppression diodes for low let-through voltages and robust surge current handling.
• Ultra-Slim Space-Saving Design: Exceptionally slim footprint allows for high packing densities on DIN rails with individual modules that can "double-up" as feed-through terminals.
• Hazardous Area Certified: ATEX and IECEx certified for use in potentially explosive atmospheres (Zone 2), complying with IEC 60079-0:2017 and IEC 60079-7:2015 standards.
• Simple DIN Rail Installation: Snap-on mounting to standard 35mm top-hat DIN rail with automatic grounding via the DIN rail clip.
• 10-Year Product Warranty: Backed by Eaton MTL's industry-leading 10-year product warranty for long-term reliability.

The SD07X is particularly well-suited for thermocouple applications where minimal series resistance is critical to maintaining signal integrity and measurement accuracy.

1. Snap the SD07X onto standard 35mm top-hat DIN rail until it clicks securely into place
2. Ensure proper grounding through the DIN rail (automatic when mounted on grounded rail)
3. The ultra-slim footprint allows high-density side-by-side mounting

The SD07X features two terminals for 2-wire loop protection:

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

The MTL SD07X Surge Protector delivers reliable, high-performance protection for low voltage signal circuits, with special optimization for thermocouple (THC) applications. With its ultra-low 2.2 Ω series resistance, 7V DC / 5V AC rating, <12V protection level, and hazardous area certifications, the SD07X is the ideal choice for engineers seeking to protect sensitive low-level instrumentation without compromising measurement accuracy.

Protect your sensitive thermocouple and low-level signal circuits with MTL SD07X - the low-resistance surge protection solution for harsh and hazardous environments.