Low voltage selectivity

Combine safety with continuity of service, and easy fault location

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Advantages

Service continuity
Power quality
Stress reduction
Easy maintenance

Basic concepts

Main definitions

Learn more about selectivity: let's start with ABC.

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Selectivity techniques

The different selectivity techniques, also from the operational point of view.

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Tools & Support

SOC

SOC is a tool that can be used to choose and coordinates ABB protection devices.

Curves

Curves is a  tool found in the e-Design suite, which is used for setting the trip characteristics of the protection devices and verifying selectivity in low voltage plants. 

DOC

DOC is a tool found in the e-Design suite used for calculating and sizing medium- and low-voltage electrical installations, and for selecting and coordinating ABB protection devices.

Technical documentation

Here are some documents from ABB Library to get deeper information about theory, basic techniques, applications and case studies.

Special applications

Complex networks
High fault currents

Focus on

Standard requirements

The requirements about selectivity, from the international Standards.
Low voltage/Medium voltage selectivity

How to get selectivity between low and medium voltage devices.
Residual current selectivity

How to get selectivity between residual current protective devices.
Real currents inside circuit-breakers

Evaluation of the real currents circulating inside circuit-breakers.
Selectivity with fuses

Here you can find the main rules to design selectivity between fuses or fuses and breakers.

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