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Schneider Electric A9N21404 — Miniature Circuit Breakers (MCB)

Schneider Electric A9N21404 DT40N MCB, 6 A, C Curve, 3P+N, 6

MPNA9N21404
Obsolete

Schneider Electric ProDis DT40N, miniature circuit breaker, 3P+N, 6 A, C curve, 6 kA Icn / 10 kA Icu, clip-on DIN rail.

Schneider Electric A9N21404 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

A9N21404 — Identification
ParameterValue
Product nameDT40
Product rangeProdis
Product range (series)ProDis
Product/component typeMiniature circuit-breaker
Device applicationDistribution
A9N21404 — Ratings
ParameterValue
Rated current (In)6 A
Poles configuration3P + N
Number of protected poles3
Breaking capacity6000 A Icn at 400 V AC 50 Hz conforming to EN/IEC 60898-1 10 kA Icu at 400...415 V AC 50 Hz conforming to IEC 60947-2
Rated service breaking capacity (Ics)6000 A 100 % x Icn at 400 V AC 50 Hz conforming to EN/IEC 60898-1 7.5 kA 75 % x Icu at 400 V AC 50 Hz conforming to IEC 60947-2
Rated operational voltage (Ue)230 V AC 50 Hz between phase and neutral 400 V AC 50 Hz between phases
Rated insulation voltage (Ui)400 V AC 50 Hz
Rated impulse withstand voltage (Uimp)4 kV conforming to IEC 60947-2
Network type (AC/DC)AC
Network frequency50 Hz
A9N21404 — Protection
ParameterValue
Curve codeC
Trip unit technologyThermal-magnetic
Magnetic tripping limit5...10 x In
Earth-leakage protectionSeparate block
Suitability for isolationYes
Limitation class3 conforming to EN/IEC 60898-1
Electrical durability (cycles)20000 cycles
Mechanical durability (cycles)20000 cycles
A9N21404 — Mechanical
ParameterValue
Mounting supportDIN rail
Mounting modeClip-on
Control typeToggle
Terminal connection typeTunnel type terminals downstream 0.33...10 mm² flexible Tunnel type terminals downstream 0.75...16 mm² rigid Tunnel type terminals upstream 0.33...10 mm² flexible Tunnel type terminals upstream 0.75...16 mm² rigid
Terminal tightening torque2 N.m
Wire stripping length13 mm
Contact position indicatorYes
Local signalling/indicationON/OFF indication
Width54 mm
Height81 mm
Depth78 mm
Number of 9 mm pitches6
A9N21404 — Environmental
ParameterValue
Operating ambient temperature-25...70 °C
Storage ambient temperature-40...70 °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
A9N21404 — Approvals
ParameterValue
StandardsEN/IEC 60898-1 EN/IEC 60947-2

Product details

The A9N21404 is a Schneider Electric DT40N miniature circuit breaker from the ProDis range, rated 6 A with a C trip curve (magnetic tripping between 5 and 10 times In). The 3P+N configuration protects three poles; the neutral is switched but not protected. Thermal-magnetic trip technology: the bimetal handles sustained overloads, the solenoid clears short-circuits.

Dual-rated to EN/IEC 60898-1 (domestic/commercial MCB) and EN/IEC 60947-2 (industrial circuit-breaker). Pollution degree 3, limitation class 3, tropicalisation level 2 per IEC 60068-1. IP20 finger-safe terminals. NF quality label. The dual standard is the key detail: it lets you use this breaker in either a residential consumer unit or an industrial panel without changing the part number — just watch which breaking capacity applies under each standard.

MPN
A9N21404