Learning path

Knowledge Hub

From lightning concepts to low-voltage power-line SPD products—a structured guide for engineers, panel builders, and local partners.

3. Low-Voltage Power System Basics · Page 3 of 6

MDB, SDB and Final Circuits

Map protection stages to the physical board hierarchy.

Main distribution board

Highest energy exposure. Often the home of Type 1 or Type 1+2 SPDs when an external LPS or overhead line is present.

Sub-distribution

Type 2 SPDs reduce residual surges before they fan out to many final circuits.

Final / equipment level

Type 3 or point-of-use protection tightens voltage for PLCs, servers, medical devices, and access controllers.

← TN, TT and IT Earthing Systems

Neutral and Protective Earth Roles →

Need help selecting an LV power-line SPD?

Talk to Protec Power about Type 1 / Type 2 staging, product selection, or becoming a local stocking agent in Southeast Asia and the Middle East.

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Local agents: ask us about stocking our products.

We warmly welcome local agents and distributors. Stock our products with confidence — we provide professional service, dependable supply support, and high-quality surge protection and access control solutions.

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Ready to supply

Ask us for stock and product availability for your local market. We support agents with clear product ranges and responsive fulfillment.

Good quality products

Factory-backed SPD and access control products built for real-world electrical and security demands.

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Technical guidance, selection support, and partnership-focused service so you can sell and support with confidence.

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