Loop current surge protection for DIN rail

SUG-4-20mA/DIN is a product of overcurrent protection for current loops used in industrial automation systems and other measurement systems.

The low attenuation of protective circuits allows for the transmission of digital signals imposed on the current loop, such as the HART protocol.

The product has 3 protective levels limiting both surge voltage and surge current. The use of automatic MOSFET fuses with a load of 100mA and very low hysteresis significantly increases the protective efficiency compared to traditional protective solutions.

The built-in additional protective circuit for the cable shield can be indirectly grounded through a gas discharge tube (GDT) or directly to the ground. Connecting terminals 3 and 4 closes the connection of the cable shield to the ground.

The SUG-4-20mA/DIN overvoltage protection product is mounted on a DIN rail of 35mm. High-quality spring-loaded terminals with a high current load limit the risk of damage during large surge impulses and momentary current overloads. The device occupies the width of one standard DIN module.

It is recommended for installation at the boundary between LPZ0 and LPZ1 zones or higher. It can be used with a 24V DC current loop potential.

Simplified internal diagram.

To ensure proper surge protection, it is recommended to use protectors on the ends of the current loop cable and to properly ground them.

Proper use of the product for current loop protection.

Technical specifications