MCCB Discrimination and Selectivity Coordination
How MCCB discrimination (selectivity) works between series breakers: current and time grading, ZSI, partial vs total discrimination, and how to read a manufacturer's selectivity table.
10 min read
Technical
Coordination guides
Guides and notes on industrial electrical and automation parts: selection, wiring, settings and ordering.
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Overload Relay Coordination: Type 1 vs Type 2 with Contactor and SCPD
How IEC 60947-4-1 Type 1 and Type 2 coordination define what happens to a contactor and overload relay after a short circuit, and how to choose between them.
9 min read
MCB and Cable Coordination: the Ib Less Than In Less Than Iz Rule
The Ib ≤ In ≤ Iz cable coordination rule under IEC 60364-4-43, why the second condition on conventional tripping current collapses for MCBs, and the fire-risk consequence of getting In...
10 min read
MPCB Type 1 vs Type 2 Coordination Explained
IEC 60947-4-1 Type 1 permits component damage after a fault while Type 2 limits it to separable contact welding, and the choice comes down to acceptable downtime on that branch.
8 min read
ABB Emax 2 Selectivity and Coordination with Downstream Breakers Guide
Learn how to calculate ABB Emax 2 selectivity and coordination with downstream breakers using IEC 60947-2 methods and real project examples. Shop at Stoklink.
23 min read
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