Fire Detector Loop Overvoltage Limiter 24V, SUG-SAP24V/DIN

SUG-SAP24V/DIN, fire detector loop limiter 24V, fire system surge protection

SUG-SAP24VDC/DIN is a surge protector designed to protect 24V sensor loops in fire alarm systems. It is dedicated for installations where the DC voltage and the variable component of the transmission signal do not exceed the maximum voltage of 32V.

Low internal resistance, low insertion capacitance, and the ability to transmit up to 3A have minimal impact on the system's operation, even with large sizes.

The protector has a protected screen terminal, which can be isolated from ground using a GDT protector or connected to ground. Connecting terminals 3 and 4 closes the connection of the screen terminal to ground.

The surge protector is designed for mounting on a DIN 35mm rail. High-quality spring terminals with high current load limit the risk of damage during large surge impacts and momentary current overloads. The device occupies the width of one standard DIN module.

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

 

Fire loop 24V surge protection

Simplified internal diagram.

 

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

 

Proper 24V fire loop protection

Example of protecting a fire loop element.

 

 

Short technical specification

PARAMETER NAME
VALUE
Number of protected tracks
3
Input / output connector
Screw
Rated DC voltage (Un)
24V
Maximum DC voltage (Uc)
32V
Maximum AC voltage (Uc) 22V
Rated current (In)
3A
C1: Line-line discharge current 8/20µs (In)
0.25kA
C2: Line-ground discharge current 8/20µs (In) 10kA
C2: Maximum line-ground discharge current 8/20µs (Imax) 20kA
D1: Maximum lightning current 10/350µs (Iimp)
3.5kA
Protection level 1kV/μs (line-line) Up 40V DC
Series resistance
~70mΩ / line
Dimensions 17.5 x 90 x 57 (mm)
Mounting method TH rail (DIN) 35mm
Grounding method
Wire
Rail occupancy
1 module
Enclosure protection IP20
Operating temperature -40ºF~80ºF