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Schneider Electric A9N18377 — Miniature Circuit Breakers (MCB)

Schneider Electric A9N18377 Acti9 C120 MCB, 125 A, C Curve,

MPNA9N18377
Active

Schneider Electric Acti9 C120, miniature circuit breaker, 4P, 125 A, C curve, 10 kA Icn at 400 V AC, clip-on DIN rail.

$128.01 – $212.12Ref. price · indicative, final on quote
Schneider Electric A9N18377 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

A9N18377 — Identification
ParameterValue
Product nameActi9 C120
Product rangeActi9
Product/component typeMiniature circuit-breaker
Device applicationDistribution
A9N18377 — Ratings
ParameterValue
Rated current (In)125 A at 30 °C
Poles configuration4P
Number of protected poles4
Breaking capacity10000 A Icn at 400 V AC 50/60 Hz conforming to EN/IEC 60898-1 6 kA Icu at 440 V AC 50/60 Hz conforming to EN/IEC 60947-2 20 kA Icu at 220...240 V AC 50/60 Hz conforming to EN/IEC 60947-2 10 kA Icu at 380...415 V AC 50/60 Hz conforming to EN/IEC 60947-2 10 kA Icu at <= 500 V DC conforming to EN/IEC 60947-2
Rated service breaking capacity (Ics)7500 A 75 % conforming to EN/IEC 60898-1 - 400 V AC 50/60 Hz 4.5 kA 75 % conforming to EN/IEC 60947-2 - 440 V AC 50/60 Hz 7.5 kA 75 % conforming to EN/IEC 60947-2 - 380...415 V AC 50/60 Hz 15 kA 75 % conforming to EN/IEC 60947-2 - 220...240 V AC 50/60 Hz 10 kA 100 % conforming to EN/IEC 60947-2 - <= 500 V DC
Rated operational voltage (Ue)380...415 V AC 50/60 Hz 220...240 V AC 50/60 Hz 440 V AC 50/60 Hz 230...400 V AC 50/60 Hz
Rated insulation voltage (Ui)500 V AC 50/60 Hz conforming to EN/IEC 60947-2
Rated impulse withstand voltage (Uimp)6 kV conforming to EN/IEC 60947-2
Network type (AC/DC)AC
Network frequency50/60 Hz
Overvoltage categoryIV
A9N18377 — Protection
ParameterValue
Curve codeC
Trip unit technologyThermal-magnetic
Magnetic tripping limit5...10 x In
Earth-leakage protectionSeparate block
Suitability for isolationYes conforming to IEC 60947-2
Limitation class3 conforming to EN/IEC 60947-2
Electrical durability (cycles)5000 cycles conforming to IEC 60947-2
Mechanical durability (cycles)20000 cycles
A9N18377 — Mechanical
ParameterValue
Mounting support35 mm symmetrical DIN rail
Mounting modeClip-on
Control typeToggle
Terminal connection typeTunnel type terminals1...50 mm² rigid Tunnel type terminals1.5...35 mm² flexible
Terminal tightening torque3.5 N.m
Wire stripping length15 mm
Contact position indicatorYes
Local signalling/indicationON/OFF indication
Width108 mm
Height81 mm
Depth73 mm
Number of 9 mm pitches12
A9N18377 — Environmental
ParameterValue
Operating ambient temperature-25...70 °C
Storage ambient temperature-40...85 °C
IP degree of protectionIP20 conforming to IEC 60529
Pollution degree3 conforming to IEC 60947-2
Relative humidity95 % at 55 °C
Tropicalisation class2 conforming to IEC 60068-1
A9N18377 — Approvals
ParameterValue
StandardsEN/IEC 60898-1 EN/IEC 60947-2

Product details

The Schneider Electric A9N18377 is a 4-pole Acti9 C120 miniature circuit breaker rated 125 A at 30 °C, with a C-curve magnetic trip (5–10 × In) and a thermal-magnetic trip unit. It clips onto a 35 mm symmetrical DIN rail for panel mounting. Breaking capacity: 10 kA Icn at 400 V AC per EN/IEC 60898-1, and 10 kA Icu at 380–415 V AC per EN/IEC 60947-2.

Integration notes

Width is 108 mm (12 × 9 mm pitches). Tunnel terminals accept 1–50 mm² rigid or 1.5–35 mm² flexible wire; strip length 15 mm, torque to 3.5 N·m. Neutral on the left, 4 protected poles, toggle control with ON/OFF local indication. Earth-leakage protection requires a separate block — not integrated. Suitable for isolation per IEC 60947-2.

Frequently asked questions

What is the breaking capacity of A9N18377?

10 kA Icn at 400 V AC per EN/IEC 60898-1, and 10 kA Icu at 380–415 V AC per EN/IEC 60947-2. Also rated 20 kA Icu at 220–240 V AC and 6 kA Icu at 440 V AC.

Where can I buy A9N18377?

Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.

What standards does A9N18377 comply with?

EN/IEC 60898-1 and EN/IEC 60947-2. Also conforms to IEC 60068-1 for tropicalisation (class 2) and IEC 60529 for IP20 protection.

MPN
A9N18377