Welcome to the ABB Selective Coordination portal. This is where you will find useful information for coordination studies and determining selectivity between overcurrent devices.
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.
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.
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.
Publication 1SDC210066D0201 - DET-760, Guide to Instantaneous Selectivity: Circuit Breaker Engineering Reference provides tables that list the instantaneous selectivity capability of various circuit breakers.
Publication DET-1020, Application Guide for Emergency Standby Systems for Elevator Switches: Selective Coordination using Circuit Breakers Feeding Elevator Switches.
Time Current Curves
ABB 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.
NEMA White Paper
The published NEMA ABP 1 provides guidance to design professional engineers and Authorities Having Jurisdiction (AHJ) on how to comply with the National Electrical Code (NEC) requirements for selective coordination for emergency circuits and legally-required standby systems (articles 620, 700, 701 and 708). This paper specifically addresses compliance with these requirements for low-voltage overcurrent protective devices.