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Schneider Electric G12T3A40 — Miniature Circuit Breakers (MCB)

Schneider Electric G12T3A40 GoPact MCCB 125, 40 A, 3P, 10 kA

MPNG12T3A40
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Schneider Electric GoPact MCCB 125, G12T3A40, 3-pole, 40 A thermal-magnetic trip unit (TM-D), 10 kA breaking capacity at 415 V AC, fixed mount, screw terminals.

$85.64Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

G12T3A40 — Identification
ParameterValue
Product nameGoPact MCCB 125
Product range (series)GoPact MCCB
Product/component typeCircuit breaker
Device applicationDistribution
G12T3A40 — Ratings
ParameterValue
Rated current (In)40 A at 40 °C
Poles configuration3P
Rated operational voltage (Ue)415 V AC 50/60 Hz conforming to EN/IEC 60947-2
Rated insulation voltage (Ui)440 V AC conforming to EN/IEC 60947-2
Rated impulse withstand voltage (Uimp)6 kV conforming to EN/IEC 60947-2
Utilisation categoryCategory A
Overvoltage categoryIII
G12T3A40 — Protection
ParameterValue
Trip unit technologyThermal-magnetic
Suitability for isolationYes conforming to EN/IEC 60947-2
Electrical durability (cycles)8000 cycles at 415 V In
Mechanical durability (cycles)30000 cycles
G12T3A40 — Mechanical
ParameterValue
Mounting supportBackplate
Control typeToggle
G12T3A40 — Environmental
ParameterValue
Operating ambient temperature-20...55 °C
Storage ambient temperature-35...85 °C
IP degree of protectionIP20 conforming to IEC 60529
Pollution degree3 conforming to IEC 60664-1
G12T3A40 — Approvals
ParameterValue
StandardsEN/IEC 60947-1 EN/IEC 60947-2 EN/IEC 60947-2 Annex H
G12T3A40 — Electrical
ParameterValue
[Icu] rated ultimate short-circuit breaking capacity10 kA Icu at 380/415 V AC 50/60 Hz conforming to EN/IEC 60947-2 20 kA Icu at 220/230 V AC 50/60 Hz conforming to EN/IEC 60947-2
[Ics] rated service short-circuit breaking capacity10 kA at 380/415 V AC 50/60 Hz conforming to EN/IEC 60947-2 20 kA at 220/230 V AC 50/60 Hz conforming to EN/IEC 60947-2
G12T3A40 — Specifications
ParameterValue
[Ir] long-time protection pick-up adjustment range0.8...1 x In
Trip unit protection functionsLI

Product details

It is rated for distribution duty (Category A) and carries a 10 kA breaking capacity at 415 V AC, 50/60 Hz, per EN/IEC 60947-2.

Mounting and integration notes

Mounts fixed to a backplate — not DIN-rail snap-on — so plan for screw-terminal connection with a 25 mm pole pitch. Accepts horizontal or vertical orientation, flat on the back. Front terminals on both line and load sides simplify busbar or cable routing in a standard distribution panel.

Durability and thermal budget

Mechanical durability is rated at 30,000 cycles; electrical durability at 8,000 cycles at rated current and 415 V. That is typical for a distribution MCCB — not intended for frequent switching like a contactor, but reliable for occasional isolation and fault protection over the panel's service life. Power dissipation per pole is 18.7 W at rated current, so total 3-pole dissipation is about 56 W — account for that in enclosure thermal calculations. Altitude derating applies above 2000 m — no derating needed below that.

Frequently asked questions

What is G12T3A40's listed colour (Grey (RAL 7035)) on this component line?

The G12T3A40 is listed as Grey (RAL 7035), the standard industrial light-grey finish for the GoPact MCCB range.

MPN
G12T3A40