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Selective Coordination
Selective Coordination


Welcome to the GE Selective Coordination portal. This is where you will find useful information for coordination studies and determining selectivity between overcurrent devices.

InstaPlan®
Intense discussions with electrical system designers have led to the development of InstaPlan, a tool for planning power system instantaneous selective coordination. InstaPlan allows the accurate and quick selection of circuit breakers based on their potential for being selective up to the full theoretical bolted fault value on a protected circuit.

You provide information regarding utility bus interrupting current levels, conductors, and distribution transformers. InstaPlan then estimates fault values at multiple buses, including asymmetry, and provides a selection of circuit breakers that are able to deliver the required fault and instantaneous selectivity performance.
• Download & Install InstaPlan® 2.0
• View Sample Screenshots (PDF)

Overcurrent Device Look-up Tables and System Design Guide
Our selective coordination look-up tables are quick and easy to use. They comprise multiple tables for main (or upstream) and branch breakers. Simply match the required main and branch circuit current ratings and select the combination based on the available short circuit current.

GE Publication DET-537, Overcurrent Device Instantaneous Selectivity Capabilities provides instructions, tables and sample one-line diagrams to display the instantaneous selectivity capability of various overcurrent devices. A broad range of circuit breakers from 15 amperes to 5000A amperes are described in various detailed tables as well as simpler to use summary tables.
• Download Publication (PDF)

GE Publication DET-654, Guide to Low Voltage System Design and Selectivity puts some of the most useful information included in DET-537 into an easy to use format. The publication includes text on selectivity interpretation and enforcement, a graphical representation of selective breaker pairs, and a set of templates designed around common transformer sizes.
• Download Publication (PDF)

Time Current Curves
GE publishes Time Current Curves, Energy Peak-Let-Through Curves and Peak-Let-Through curves that are useful for coordination studies and other overcurrent protective device selection tasks.
• View GE Time Current Curves

Any comments or feedback?
Contact us at geelectrical@ge.com.