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F-48 Series SPD
F-48 series surge protective device is designed for protecting devices in the field from being damaged by surges and field instruments which is usually caused by lightning strikes.
Product Advantage
1. Conveniently installed on spare screwed holes of protected devices.
2. Paralleled with signal cables of protected devices.
3. Protecting 2-wire, 3-wire, 4-wire field devices.
Technical Parameters

Product Uses
For protecting field instruments in areas prone to lightning strikes.
F-48 series surge protective device is designed for protecting devices in the field from being damaged by surges and field instruments which is usually caused by lightning strikes.
Product Advantage
1. Conveniently installed on spare screwed holes of protected devices.
2. Paralleled with signal cables of protected devices.
3. Protecting 2-wire, 3-wire, 4-wire field devices.
Technical Parameters

Product Uses
For protecting field instruments in areas prone to lightning strikes.
Q: Is this SPD compatible with my existing field instruments and installation setup?
A: Yes, the F-48 series offers universal compatibility with 2-wire, 3-wire, and 4-wire field devices (transmitters, flow meters) via parallel connection that causes no signal attenuation. It features multiple threaded interfaces (1/2"NPT, M20×1.5 standard; customizable 3/4"NPT, G1/2", G3/4") to fit most instrument cable entries. The compact design (15mm diameter × 75mm length) allows direct installation on spare cable entry ports, enabling quick retrofit without process interruption or major mechanical modifications.
Q: What level of surge protection performance can I expect for my sensitive instruments?
A: The SPD provides robust lightning protection with a 10kA nominal discharge current (8/20μs waveform) and 2.5kA impulse current (10/350μs), limiting surge voltage to ≤1.0kV. It offers ultra-fast response times of 1ns (line-to-line) and 100ns (line-to-ground), with <2μA leakage current at 48V DC maximum working voltage. This ensures reliable protection against lightning-induced transients while maintaining measurement accuracy and signal integrity for critical process instruments, preventing costly downtime and equipment damage.
Q: Is this SPD compatible with my existing field instruments and installation setup?
A: Yes, the F-48 series offers universal compatibility with 2-wire, 3-wire, and 4-wire field devices (transmitters, flow meters) via parallel connection that causes no signal attenuation. It features multiple threaded interfaces (1/2"NPT, M20×1.5 standard; customizable 3/4"NPT, G1/2", G3/4") to fit most instrument cable entries. The compact design (15mm diameter × 75mm length) allows direct installation on spare cable entry ports, enabling quick retrofit without process interruption or major mechanical modifications.
Q: What level of surge protection performance can I expect for my sensitive instruments?
A: The SPD provides robust lightning protection with a 10kA nominal discharge current (8/20μs waveform) and 2.5kA impulse current (10/350μs), limiting surge voltage to ≤1.0kV. It offers ultra-fast response times of 1ns (line-to-line) and 100ns (line-to-ground), with <2μA leakage current at 48V DC maximum working voltage. This ensures reliable protection against lightning-induced transients while maintaining measurement accuracy and signal integrity for critical process instruments, preventing costly downtime and equipment damage.
