Circuit Breakers & Fuses – Guide to Electrical Installation Protection

Difference between automatic and fuse-type protection

Automatic circuit breakers can be reset after tripping, making them more practical for household use and saving money on replacements. Fuse-type protectors use a ceramic or glass tube with a metal wire that melts during overload and require complete replacement after activation. In modern installations, automatic breakers dominate thanks to precise protection and the ability to be switched back on.

How to select the correct current rating

The breaker's current rating must match the wire cross-section and load type – typically 10A for lighting, 16A for sockets, 20-25A for water heaters or air conditioning units. Oversized ratings don't provide adequate protection, while undersized ones cause frequent nuisance tripping during normal operation. Brands like ETI and AUTOMATSKI offer a wide range of nominal currents from 6A to 63A for different applications.

B, C and D tripping characteristics

The B, C or D marking alongside the current indicates the short-circuit response speed. Type B (3-5x nominal current) is used for lighting and heaters without motor starting. Type C (5-10x nominal current) is the most common choice for mixed household loads. Type D (10-20x nominal current) is reserved for motors and transformers with high inrush currents during startup.

RCD protection switches – additional safety

RCD (residual current device) switches protect against electric shock by detecting the difference between incoming and outgoing current at just 30mA leakage. They are mandatory in wet areas (bathroom, kitchen) and for outdoor installations according to current regulations. Combined devices that integrate automatic circuit breaker and RCD protection in one housing enable more compact and economical installation.

What to check before buying

Verify the breaking capacity (expressed in kA) – for household use the minimum is 4.5kA, while industrial installations require 6kA or higher. Quality manufacturers like ETI and Mak Trade guarantee certified protection according to IEC standards and long-lasting tripping mechanisms. Always choose breakers with clearly marked technical data and avoid unknown brands for critical protective equipment.

Selection and Pricing

We offer 48 products from 4 brands across 2 sellers. Prices range from 300 to 3,899 RSD.