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Schneider Electric A9N21408 — Miniature Circuit Breakers (MCB)

Schneider Electric A9N21408 DT40N MCB, 25 A, C Curve, 3P+N,

MPNA9N21408
Obsolete

Schneider Electric Prodis DT40N miniature circuit breaker, 25 A, C curve, 3P+N, 6 kA Icn (EN/IEC 60898-1) / 10 kA Icu (IEC 60947-2), clip-on DIN rail, IP20.

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

A9N21408 — Identification
ParameterValue
Product nameDT40
Product rangeProdis
Product range (series)ProDis
Product/component typeMiniature circuit-breaker
Device applicationDistribution
A9N21408 — Ratings
ParameterValue
Rated current (In)25 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
A9N21408 — 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)10000 cycles
Mechanical durability (cycles)20000 cycles
A9N21408 — 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
A9N21408 — 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
A9N21408 — Approvals
ParameterValue
StandardsEN/IEC 60898-1 EN/IEC 60947-2

Product details

It clips onto DIN rail and is built for distribution applications in residential and commercial panels. Breaking capacity is dual-rated: 6000 A Icn at 400 V AC per EN/IEC 60898-1 for general distribution, and 10 kA Icu at 400–415 V AC per IEC 60947-2 for industrial coordination. That 10 kA rating gives headroom in sub-distribution boards where fault levels are higher than a standard domestic board.

Clip-on mounting to DIN rail (35 mm per EN 60715) — no tools needed for rail attachment. The 3P+N occupies 6 module pitches (9 mm each), so it takes 54 mm of rail width. IP20 finger-safe terminals allow panel wiring without additional shrouding.

Compliance covers both the wiring-rule standard (EN/IEC 60898-1) and the industrial standard (EN/IEC 60947-2), so the breaker qualifies for installations where the local code requires either. Operating altitude is limited to 2000 m without derating. Earth-leakage protection requires a separate block (not integrated). The neutral pole is left-positioned, and the toggle provides local ON/OFF indication.

Frequently asked questions

How do I get current pricing and availability for A9N21408?

Pricing and availability are confirmed at quote time. Submit an RFQ through the storefront; the response includes current lead time and per-unit pricing for your quantity.

What is A9N21408's breaking capacity at 400 V?

The A9N21408 carries a dual breaking capacity: 6000 A Icn at 400 V AC per EN/IEC 60898-1, and 10 kA Icu at 400–415 V AC per IEC 60947-2.

What compliance standards does A9N21408 meet?

It complies with EN/IEC 60898-1 and EN/IEC 60947-2, with pollution degree 3 per IEC 60947-2 and tropicalisation class 2 per IEC 60068-1.

MPN
A9N21408