Surge protector for 24VAC power supply

SUG-7/24VAC - power supply surge protection 24V AC, power supply surge protection, 24V surge protector

SUG-7 / 24VAC is designed to protect electronic devices supplied with 24V alternating voltage against lightning, surge pulses as well as from a sudden increase in voltage, which may occur as a result of damage to the AC adapter. Built-in 2A circuit breaker (on request also available with 1,1A fuse) limits the risk of damage to the AC adapter (transformer) and the risk of fire in the event of a short circuit in the wiring or in the connected receiving device.

Protection is equipped with removable screw terminals to simplify installation and maintenance.


It can be used for any electronic devices powered by 24V AC, such as industrial automation, industrial cameras, etc. It is connected between the power source (transformer) and the receiving device.

Surge protection 24VAC

A simplified block diagram

In order to ensure effective protection against lightning strikes, we recommend the use of two protection devices and grounding. One of the devices should be connected as close to the power source as possible and the second closest to the receiving device. It should be noted that the INPUT side of SUG-7(LINE) must always be on the side of long cables, which can induce impulse overvoltage.

How to protect power supply 24V

Example of proper security supply line



Technical specification:
Related Voltage DC (wire-wire) UN 24VAC
Maximum continuous operating voltage (wire-wire) UC 27VAC
Related Voltage DC (wire-ground) UN 90VDC
protection level Iimp (10/1000μs) 28A
Protection level C2 (8/20µs, shield-ground) Iimp 2 x 10kA
Nominal current IN 2A @ 24VAC
Maximum current IN 3,5A @ 24VAC
Tightness IP20
Operating temperature -30°C~60°C
Dimensions 74 x 32 x 25 (mm)