Surge arrester T1, T2 (B, C) - leakage current free ETITEC SM T12 300/25 1+0 002440738

Protection of electrical installations with surge limiters ETITEC SM T1

The ETITEC SM T12 300/25 1+0 surge limiter is a reliable element protecting the electrical installation against the effects of atmospheric and switching surges. A class T1 and T2 device, based on leakage current-free technology, provides comprehensive protection in TN, TN-C and TN-S networks. Mounting is done on a standard TH-35 mm rail, which facilitates integration with existing switchboards.

Design and application

The design of the limiter is based on technology that allows for a quick response to sudden voltage increases, while minimizing the risk of damage. Because it is a class 1+2 limiter, it effectively protects against both direct lightning strikes (class T1) and surges resulting from switching loads (class T2). Application in residential, commercial and industrial buildings guarantees the safety of electrical and electronic devices. Optical indication of operation facilitates the identification of the need to replace the limiter after a surge.

Key features and benefits

• High protection efficiency: Surge current of 25 kA (10/350 µs) provides effective protection against strong surges.

• Versatility: Possibility of use in various network configurations – TN, TN-C, TN-S – increases installation flexibility.

• Compact dimensions: Two modules wide allow for easy integration with existing switchboards.

• Leakage current-free: Eliminates the risk of unwanted leakage currents, which increases safety.

• Optical indication: Quick identification of the device status – visual information about the need for replacement after operation.

• Large conductor cross-section: Supports conductors with a cross-section of up to 35 mm² (solid/stranded) and 25 mm² (flexible) ensuring compatibility with various types of installations.

• Energy absorption: Specific energy at 156.2 kJ/Ohm indicates the ability to absorb a large amount of energy during a surge.

• Protection level: Provides a protection level of 1.5 kV L-N and N-PE, which is crucial for protecting sensitive electronic devices.