MTLSD32X Surge Protection Device 25 kHz MTL Surge Arrestor for Data & Signal applications

The SD32X is a surge protection device manufactured by Eaton’s MTL product line. It is designed to protect data, signal, and I/O circuits from transient overvoltages caused by lightning or switching events.

Key Specifications

• Brand & Series: Eaton / MTL, SDX Series
• Model: SD32X
• Nominal Voltage: 32 V DC / 22 V AC or 36 V AC
• Maximum Continuous Operating Voltage (MCOV): 32V
• Nominal Discharge Current (In): 10 kA (8/20 µs waveform)
• Maximum Discharge Current (Imax): 10 kA or 20 kA (depending on documentation, typically 10 kA)
• Current Rating: 400 mA
• Response Time: Extremely fast, typically 1 nanosecond (ns)
• Mounting: DIN-rail mount
• Dimensions (W x H x D): 7 mm x 109.6 mm x 99 mm

Key Features & Benefits

• Ultra-Slim Design: With a width of just 7mm, it saves valuable space on the DIN rail, allowing for high-density installation in control cabinets.
• Hybrid Protection Circuit: Utilizes a reliable hybrid circuit design to provide efficient multi-stage surge protection.
• High Signal Integrity: Features low impedance and low leakage current, making it ideal for 4-20 mA analog loops, thermocouples, and switching signals without affecting normal signal transmission.
• Intrinsically Safe: Certified by BASEEFA and CSA for use in hazardous areas. It can be installed on intrinsic safety circuits without compromising the intrinsic safety certification.
• Easy Installation: Standard DIN-rail clip-on mechanism for quick and simple installation and maintenance.

Typical Applications

The SD32X is primarily used to protect low-voltage signal circuits in industrial automation and process control systems.

• Process automation I/O cards
• 4-20 mA analog signal loops
• Thermocouple (THC) sensors
• Flame and gas detectors
• Emergency shutdown systems

Series Comparison

The SDX series offers various voltage ratings to suit different signal types. The SD32X is positioned for general-purpose I/O and 4-20 mA loops.