Terelec surge and voltage protection devices safeguard electrical installations and connected equipment from transient overvoltages caused by lightning strikes, switching operations and power network disturbances. Since the introduction of 18th Edition Amendment 2 (BS 7671:2018+A2:2022) in 2022, a risk assessment for transient overvoltages is required on all new electrical installations in the UK. In the vast majority of domestic and commercial premises, this assessment results in a requirement to fit an SPD. Terelec Type 2 SPDs provide a straightforward, cost-effective solution for compliance. Our SPD range covers single-phase consumer unit applications (1P+N), single-pole sub-distribution boards, and two, three and four-pole three-phase installations. Browse by application using the subcategories below. Compliance documentation is available for verified product ranges. Contact our technical team for product-specific documentation.