Surge Protection for 48V DC Power Supply Mounted on DIN Rail

SUG-48VDC/DIN, Overvoltage protection for 48V DC power lines, dedicated to power supplies and industrial automation devices powered by 48V DC voltage

SUG-48VDC/DIN is designed to protect electronic devices powered by 48V DC from atmospheric discharges, voltage surges, and sudden voltage spikes that may occur due to damage to the power supply.

The ability to transmit up to 5A of current expands the range of applications for the device to many industrial automation installations, building automation, and property protection systems.

The surge protection product is designed for mounting on a 35mm DIN rail. High-quality window clamps with high current load limit the risk of damage during large impulse shocks and momentary current overloads. The device occupies the width of one DIN standard module.

It is recommended for installation at the boundary between LPZ0 and LPZ1 zones or higher. It can only be used for transmitting 48V DC voltage, without any AC component - for example, for fast data transmission. It is connected between the power source (power supply, battery) and the receiving device.



Simplified internal diagram.


To ensure proper surge protection, it is recommended to use the product at both ends of the power line and to properly ground it.


48V DC power surge protection

Proper use of the product for surge protection of 48V DC power lines.


Technical specifications

Number of protected channels
Input / output connector
DC rated voltage (Un)
Maximum DC voltage (Uc)
Maximum AC voltage (Uc) 40V
Rated current (In)
C1: Line-line discharge current 8/20µs (In)
C2: Discharge current line-ground 8/20µs (In) 10kA
C2: Maximum discharge current line-ground 8/20µs (Imax) 20kA
D1: Maximum lightning current 10/350µs (Iimp)
Protection level 1kV/μs (line-line) Up 70V DC
Series resistance
~38mΩ / line
Dimensions 17.5 x 90 x 57 (mm)
Mounting method TH rail (DIN) 35mm
Grounding method
Rail occupancy
1 module
Enclosure protection IP20
Operating temperature -40ºC~80ºC