Varistor surge protector type 3, class D, for mounting in a box, SM3D 85303000

Surge protection for your installation

This type 3, class D varistor-spark gap surge protector is a key element in protecting your electrical installation and connected devices. Designed for mounting in a junction box, it provides an effective barrier against sudden voltage spikes that can damage sensitive electronic equipment. This is an ideal solution for both installers and end-users looking for reliable protection.

Construction and application

The SM3D surge protector is designed to protect household appliances, RTV equipment, computers and other sensitive receivers from the effects of overvoltage. Its compact dimensions (50 x 30 x 11 mm) allow for easy mounting in a standard junction box with a diameter of 60 mm. Thanks to the combination of varistor and spark gap technology, it provides a quick and effective response to sudden voltage changes. When the surge protector operates, an audible signal is emitted to indicate the need for replacement – this simple solution allows for quick identification of the damage and restoration of full protection.

Key features and benefits

• Versatile application: ideal for protecting household appliances, RTV equipment, computer systems and smart home systems.
• Compact size: allows for discreet mounting in a standard junction box.
• Audible signaling: informs about the operation of the surge protector and the need for replacement.
• Fast response: thanks to the combination of varistor and spark gap technology, it provides lightning-fast protection against surges (response time less than 25 ns).
• Wide range of wires: accepts wires with a cross-section from 2.5 mm² to 35 mm² (solid) and from 2.5 mm² to 25 mm² (stranded), making it easy to integrate with various installations.
• Class D protection: effectively protects against surges induced inside buildings.
• Rated AC voltage: 230 V – standard mains voltage in most installations.
• Discharge current: up to 1.5 kA – provides protection against typical surges occurring in home installations. Maximum discharge current is 3 kA.
• Protection level: ≤ 1.5 kV – effectively reduces the surge voltage to a safe level for connected devices.

The SM3D surge protector is an investment in the safety of your electrical installation and peace of mind. It provides reliable protection against the effects of sudden voltage spikes, protecting valuable equipment from damage.