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Schneider Electric A9N18378 — 1-Pole MCB (DIN Rail)

Schneider Electric A9N18378 Acti9 C120N MCB, 1P D 63 A, 10 k

MPNA9N18378
Obsolete

Schneider Electric Acti9 C120N miniature circuit-breaker, A9N18378, 1P, D-curve, 63 A rated current, 10 kA Icn, clip-on 35 mm DIN rail.

Schneider Electric A9N18378 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

A9N18378 — Identification
ParameterValue
Product nameActi9 C120
Product / component typeMiniature circuit-breaker
Product rangeActi9
Device short nameC120N
Poles description1P
Number of protected poles1
Device applicationDistribution
A9N18378 — Electrical & Protection
ParameterValue
Rated current (In)63 A at 30 °C
Rated operational voltage (Ue)380...415 V AC 50/60 Hz 125 V DC 12 V DC 220...240 V AC 50/60 Hz 230...400 V AC 50/60 Hz 130 V AC 50/60 Hz 12 V AC 50/60 Hz
Tripping curve codeD
Magnetic tripping limit10...14 x In
Breaking capacity (Icu / AIR)3 kA Icu at 380...415 V AC 50/60 Hz IT conforming to EN/IEC 60947-2 20 kA Icu at 130 V AC 50/60 Hz conforming to EN/IEC 60947-2 15 kA Icu at 12 V DC conforming to EN/IEC 60947-2 15 kA Icu at 125 V DC conforming to EN/IEC 60947-2 10 kA Icu at 10 kA Icu at 220...240 V AC 50/60 Hz conforming to EN/IEC 60947-2 20 kA Icu at 12 V AC 50/60 Hz conforming to EN/IEC 60947-2 10000 A Icn at 230/400 V AC 50/60 Hz conforming to EN/IEC 60898-1
Network type (AC/DC)AC
Network frequency50/60 Hz
Overvoltage categoryIV
Trip unit technologyThermal-magnetic
Control / actuation typeToggle
Mechanical durability (cycles)20000 cycles
A9N18378 — Mounting & Connection
ParameterValue
Terminal connections / wire rangeTunnel type terminals1...50 mm² rigid Tunnel type terminals1.5...35 mm² flexible
Mounting support35 mm symmetrical DIN rail
Mounting modeClip-on
Width27 mm
Height81 mm
Depth73 mm
Tightening torque (by circuit)3.5 N.m
A9N18378 — Environmental
ParameterValue
Operating ambient temperature-25...70 °C
Storage ambient temperature-40...85 °C
IP degree of protectionIP20 conforming to IEC 60529
A9N18378 — Approvals
ParameterValue
Conformity standardsEN/IEC 60898-1 EN/IEC 60947-2
A9N18378 — Electrical
ParameterValue
[Ui] rated insulation voltage500 V AC 50/60 Hz conforming to EN/IEC 60947-2
[Uimp] rated impulse withstand voltage6 kV conforming to EN/IEC 60947-2

Product details

The Schneider Electric A9N18378 is a 1-pole miniature circuit-breaker from the Acti9 C120 range, rated 63 A at 30 °C with a D tripping curve. The D-curve magnetic trip fires at 10 to 14 times the rated current, so it avoids nuisance tripping on inductive loads while still clearing a hard fault.

Rated Icn is 10000 A at 230/400 V AC per EN/IEC 60898-1, and the Icu per EN/IEC 60947-2 reaches 10 kA at 220...240 V AC and 3 kA at 380...415 V AC (IT system). That dual-rating means the breaker can serve both residential-style final circuits (60898-1) and industrial panel feeders (60947-2) — a single part number covers both compliance paths.

Occupies 27 mm width (3 x 9 mm pitches) on the DIN rail. Tunnel terminals accept 1...50 mm² rigid or 1.5...35 mm² flexible; strip length 15 mm, tighten to 3.5 N.m. The toggle gives local ON/OFF indication and a contact position indicator confirms isolation status per IEC 60947-2.

Frequently asked questions

What is A9N18378's listed range (Acti9) on this component line?

It belongs to the Acti9 range, specifically the Acti9 C120 product family, with the device short name C120N.

MPN
A9N18378