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Schneider Electric A9N21397 — Miniature Circuit Breakers (MCB)

Schneider Electric A9N21397 DT40N MCB, 20A 3P D-Curve, 6kA/1

MPNA9N21397
Obsolete

Schneider Electric ProDis DT40N, miniature circuit-breaker, 20 A, 3P, D curve, 6 kA Icn / 10 kA Icu, clip-on DIN rail.

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

A9N21397 — Identification
ParameterValue
Product nameDT40
Product rangeProdis
Product range (series)ProDis
Product/component typeMiniature circuit-breaker
Device applicationDistribution
A9N21397 — Ratings
ParameterValue
Rated current (In)20 A
Poles configuration3P
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)400 V AC 50 Hz between phases
Rated insulation voltage (Ui)440 V AC 50 Hz
Rated impulse withstand voltage (Uimp)4 kV conforming to IEC 60947-2
Network type (AC/DC)AC
Network frequency50 Hz
A9N21397 — Protection
ParameterValue
Curve codeD
Trip unit technologyThermal-magnetic
Magnetic tripping limit10...14 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
A9N21397 — 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
A9N21397 — 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
A9N21397 — Approvals
ParameterValue
StandardsEN/IEC 60898-1 EN/IEC 60947-2

Product details

The 6 kA Icn (per EN/IEC 60898-1) is the rated short-circuit capacity for general distribution; the 10 kA Icu (per IEC 60947-2) is the ultimate breaking capacity at 400...415 V AC, giving you SCCR headroom for industrial panel coordination studies. Three poles protected (3P), thermal-magnetic trip unit, 50 Hz network frequency. The clip-on mounting snaps onto standard DIN rail — 6 module pitches (54 mm wide) so it occupies the expected footprint for a 3-pole MCB. Tightening torque 2 N·m, strip length 13 mm.

This breaker carries dual certification to EN/IEC 60898-1 (the household / similar installation standard) and EN/IEC 60947-2 (the industrial low-voltage switchgear standard). In practice, that means it can serve in a distribution board under the domestic standard's 6 kA Icn rating, but also qualifies for industrial panel use where the 60947-2 rating of 10 kA Icu applies. Pollution degree 3 (conductive pollution typical in industrial enclosures) and limitation class 3 per 60898-1 confirm it limits let-through energy for downstream equipment protection.

Frequently asked questions

What is the breaking capacity of A9N21397?

6 kA 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 panel duty.

Where can I buy A9N21397 and how is it quoted?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer.

What compliance documentation does Schneider provide for A9N21397?

The breaker carries EN/IEC 60898-1 and EN/IEC 60947-2 certification, NF quality label, and tropicalisation per IEC 60068-1. Pollution degree 3 and limitation class 3 are documented. For specific RoHS/REACH/UL declarations, the manufacturer's compliance documentation is available on request.

MPN
A9N21397