100V Speaker Line Surge Protector in DSO Systems

SUG-DSO/DIN, surge protector dedicated to 100V speaker lines in DSO systems

SUG-DSO/DIN is a device that protects amplifiers and speakers in voice warning systems (DSO) and other radio node systems, where the standard signal is 100V line.

Low internal resistance, low insertion capacitance and the ability to transmit currents up to 5A have minimal impact on the transmitted signals.

The surge protector is designed to be mounted on a DIN 35mm rail. High-quality window terminals with high current load reduce the risk of damage during large shock impulses and temporary current overloads. The device occupies the width of one standard DIN module.

The product is recommended for installation at the boundary between LPZ0 and LPZ1 zones or higher.


DSO 100V speaker line surge protector

Simplified internal diagram.


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


DSO Loudspeaker Line Surge Protection


Example of protection for DSO loudspeaker line.



Short technical specification

Number of protected channels
Input / output connector
Nominal voltage Vpp (Un)
Maximum DC voltage (Uc)
Nominal current (In)
C1: Discharge current line-line 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 350V DC
Series resistance
~38Ω / 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