Surge Protection 24V AC / 36V DC

SUG-24VAC is a miniature surge protector designed to protect electronic devices from atmospheric discharges, powered by 24V AC transformers or 36V DC.

The ability to transmit up to 3A of current allows for use in most industrial automation, building automation, and property protection systems.

High-quality window clamps with high current load limit the risk of damage during large shock impulses and momentary current overloads. Thanks to its small size, it does not take up much space and can be hidden in small enclosures or electrical boxes.

The device has 2 protected power supply channels and an additional protected screen circuit. This solution can be used in installations where it is necessary to shield the power supply from electromagnetic interference.

The product is intended for installation and is recommended for mounting at the boundary between LPZ0 and LPZ1 zones or higher. It can only be used for transmitting 24V AC 50Hz or 60Hz alternating voltage or 36V DC direct voltage, without a variable component in the form of fast data transmissions. It is connected between the power source (transformer) and the receiving device.

24VAC or 36VDC Surge Protection

Simplified internal diagram.


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


24VAC Surge Protection

Surge protection for 24V AC power line.



36VDC Measurement Line Surge Protection

36V DC measurement line protection with wire shielding


Short technical specification

Number of protected tracks 3
Input / output connector
Rated DC voltage (Un)
Maximum DC voltage (Uc)
Rated AC voltage (Un) 26V
Maximum AC voltage (Uc) 31V
Rated current (In)
C1: Line-to-line discharge current 8/20µs (In)
C2: Line-to-ground discharge current 8/20µs (In) 10kA
C2: Maximum line-to-ground discharge current 8/20µs (Imax) 20kA
D1: Maximum lightning impulse current 10/350µs (Iimp)
Protection level 1kV/μs (line-line) Up 50V DC
Series resistance
~7mΩ / line
Dimensions 57 x 32 x 28 (mm)
Mounting method Freestanding enclosure
Grounding method
Enclosure protection IP20
Operating temperature -40ºC~80ºC