MTL TP48 Surge Protector 20kA 1/2" NPT 3-Wire Surge Protection Device for Transmitters

The TP48‑3‑N‑NDI is a high‑performance surge protection device designed for industrial process measurement and control systems. Engineered to deliver reliable transient overvoltage protection, this module safeguards 3‑wire transmitters, instruments, and field devices from damaging surges, spikes, and electromagnetic interference. Built with robust construction and certified for hazardous area applications, the TP48‑3‑N‑NDI ensures stable operation and extended service life in demanding industrial environments.

• 3‑wire surge protection for process transmitters and field instruments
• Rugged design suitable for continuous operation in industrial environments
• Compact structure for easy installation and space‑saving layout
• Stable performance with low insertion loss and no interference with signal transmission
• 1/2" NPT connection for standard field mounting
• High surge immunity and reliable fault protection
• Compatible with a wide range of industrial control and monitoring systems
• Built to meet strict industry safety and performance standards

• Oil & gas processing facilities
• Petrochemical plants
• Industrial automation systems
• Power generation and distribution
• Water treatment and utility systems
• Process control and instrumentation
• Hazardous and harsh industrial environments

• Area Classification: Hazardous/Classified Locations
• Standards: NEC/CEC, IEC, IECEx/ATEX
• IECEx/ATEX Hazardous Rating: Zone 2
• Category Tested per IEC 61643-21: A2, B2, C1, C2, C3, D1
• Compliance: IEC 61508, IEC 61511

The Crouse-Hinds series MTL TP48 surge protection device safeguards field-mounted process transmitters where it matters, right at the unit. After a simple installation (the TP48 screws into an unused conduit entry, with no additional modification), it provides high-level protection against surges and transients while normal operation remains unaffected.

The TP48 resets itself automatically after each operation. The device is available with screw threads to suit different transmitters, with explosion-proof and intrinsically safe options for hazardous areas. Working voltage is 48V dc maximum with impulse ratings of 10kA peak current and 10kV peak voltage.