Surge protective device type 1+2 (class B+C) SPBT12-280/2 158309

Surge protection in electrical installations

The SPBT12-280/2 surge limiter is a reliable device designed to protect electrical installations from the effects of surges, both of atmospheric origin (lightning strikes) and of switching origin. Protection class 1+2 (B+C) ensures effective protection at the first stage, damping both direct and indirect strikes. Installing this type of limiter in the main distribution board is a key element in ensuring the safety of electrical and electronic devices in the building.

Construction and application

The SPBT12-280/2 limiter is mounted on a DIN TH-35 mm mounting rail and occupies 2 modules. Designed to operate in TN, TT and TN-S network systems, it offers versatility of application in various types of installations. Its construction based on varistors guarantees a quick reaction to surges and their effective damping. Optical indication of insert damage facilitates quick identification of the need for replacement, minimizing system protection downtime.

Key features and benefits

• High efficiency: Surge current of 12.5 kA per pole provides effective protection against strong surges.
• Versatility: Possibility of use in various network systems (TN, TT, TN-S) increases the range of applications.
• Replaceable inserts: Allow for quick and easy replacement of the damaged element without the need to replace the entire device – reduces operating costs.
• Optical indication: Allows for visual control of the device status and quick detection of insert damage.
• Compact dimensions: Occupies only 2 modules on the DIN rail, making it easy to install even in crowded distribution boards.
• Safety: Compliance with IEC 61643‑1+A1 and EN 61643‑11 standards guarantees a high level of safety.
• Maximum wire cross-section: Supports wires with a cross-section of up to 25 mm² (solid/stranded) and 35 mm² (flexible) ensuring compatibility with various types of installations.
• Overload protection: Possibility of using a fuse up to 160A in series with the limiter for additional protection of the installation.

The SPBT12-280/2 limiter is an investment in the safety and reliability of the electrical installation, protecting valuable equipment from damage caused by surges.