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The surge protection device, designated as S-PT-EX(I)-24DC-1/2", provides reliable protection in intrinsically safe circuits. It is constructed as an IP67 rated screw-on module, allowing for direct installation with a 1/2" NPT outer thread. This model includes a cable gland specifically designed for signal cables and features a two-stage protective circuit.

Designed for operation in challenging environments, it operates effectively within a temperature range of -40 °C to 50 °C. The housing is made of zinc die-cast material, which is surface bronzed and nickel-plated, ensuring durability and resilience. This device is compliant with various standards including IEC 60664-1 and EN 60079-0, making it suitable for use in hazardous locations.

Key specifications include a nominal voltage of 24 V DC and a maximum input current of 350 mA, with capabilities for both line-line and line-earth surge protection. The surge protection levels are rated at ≤ 50 V for line-line, ≤ 1.4 kV for line-earth, and ≤ 600 V for shield-ground, ensuring effective suppression of transient overvoltages. The device also has a response time of ≤ 1 ns for line-line and ≤ 100 ns for line-earth, providing quick action against surges.