Legrand 412221 Type 2 Surge Protective Device, 2P, 20kA, 1.2kV, for TT and TN Networks

The Legrand 412221 is a high-quality Type 2 surge protective device engineered to safeguard electrical installations in residential and commercial environments. This 2-pole device is designed to mitigate the risks associated with transient overvoltages, which can be triggered by atmospheric discharges or sudden switching operations within the power grid. By maintaining a stable voltage level, it helps prevent damage to sensitive electronic equipment and appliances, ensuring the longevity and reliability of your electrical system.

Advantages

This surge protective device offers robust protection through its 20kA discharge capacity, making it highly effective at diverting excess energy safely to the ground. Its compact 2-pole design allows for efficient installation within standard distribution boards, saving valuable space. The device is versatile, supporting compatibility with various network configurations including TT, TNC, and TNS systems, which provides flexibility for different electrical setups. With a protection level of 1.2kV, it ensures that connected devices remain within safe operating parameters during power surges.

Suitable for

• Residential electrical distribution boards
• Commercial office power systems
• Protection of household appliances
• IT and telecommunications equipment
• Small-scale industrial installations

When it may not be suitable

This device is specifically designed as a Type 2 protector and is not intended to handle direct lightning strikes or high-energy surges that require Type 1 protection. If your installation is located in an area with a high frequency of direct atmospheric discharges, a combined Type 1+2 solution may be necessary.

Key specifications

• Type: 2
• Poles: 2
• Discharge current: 20kA
• Protection level: 1.2kV
• Network compatibility: TT, TNC, TNS

How to use

The device should be installed by a qualified electrician within the main distribution board, typically connected in parallel with the electrical supply. It is essential to ensure that the wiring is performed according to local electrical codes and that the device is properly grounded to function effectively. The status indicator on the unit should be monitored periodically to ensure the protective elements are still operational.

What to consider before purchase

• Verify your network type (TT, TNC, or TNS) to ensure compatibility.
• Check the available space in your distribution board for a 2-pole module.
• Assess whether your installation requires additional Type 1 protection for lightning risks.
• Ensure the installation is performed by a certified professional.

Usage recommendations

Regularly inspect the visual status indicator on the front of the device. If the indicator changes color, it signifies that the internal protective components have reached the end of their service life and the module must be replaced immediately to maintain system safety.