Moulded Case Circuit Breakers — NM1, NXM, NM8 (63–800 A)
MCCB selection fails in one place: the breaking capacity that is quoted versus the one that is stamped on the unit. Below is the manufacturer’s published frame-versus-Icu data, so you can compare quotations honestly.
NM1 breaking capacity by frame
Frame
S (standard)
H (high)
R (current-limiting)
NM1-63
20 kA
42 kA
—
NM1-125
25 kA
50 kA
65 kA
NM1-250
25 kA
50 kA
—
NM1-400 / 630 / 800
per catalogue
per catalogue
—
Poles 2P/3P/4P with N-pole variants; direct handle, rotary-handle interlock and motorised operation; shunt trip, undervoltage and under-trip releases, auxiliary contacts, front/rear mounting plates, earth-leakage attachments.
Grading / discrimination
Send us your single-line diagram and we will check upstream/downstream coordination against the catalogue tables with you. This is the part every other trader skips, and it is the part that wins panel builders.
Cross-referencing Schneider NSx, ABB Tmax or Siemens 3VA? Start at /cross-reference/ — we state the differences rather than claiming a drop-in.
Get a Real Quotation, Not a Brochure
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