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Schneider Electric 25 A three-pole D-curve DIN rail miniature circuit breaker, grey plastic housing with screw-clamp terminals

Schneider Electric

Schneider Electric M9F43325 25 A 3-pole D-curve DIN rail miniature circuit breaker

SKU CH-DD20-3AKP3

A 25 A three-pole D-curve miniature circuit breaker for DIN rail mounting, rated 240/277/480 V AC with a 14 kA interrupting capacity and screw-clamp terminals accepting 18 to 8 AWG wire

  • Protects three-phase branch circuits with D-curve thermal-magnetic trip
  • 25 A rating suits motor-starting loads without nuisance trips
  • 14 kA interrupting capacity at 120/240 V AC handles high fault currents
  • Screw-clamp terminals accept 18 to 8 AWG conductors for secure connections
  • Compact DIN-rail mount fits 4.06 x 2.13 x 2.83 in footprint in standard enclosures

Three-pole branch protection

The Schneider Electric M9F43325 is a new DIN-rail miniature circuit breaker rated 25 A for three-phase branch circuit protection. It mounts on standard DIN rail and uses screw-clamp terminals for wires from 18 AWG to 8 AWG. Electrical installers and panel builders select it for commercial and light-industrial distribution boards.

D-curve 25 A rating

The single specification that decides fit is the D-curve thermal-magnetic trip at 25 A across three poles. This curve tolerates higher inrush currents from motors or transformers without nuisance tripping, while still providing overload and short-circuit protection per UL 489. Verify the load profile matches D-curve characteristics before specifying.

Thermal-magnetic trip with 14 kA interrupt

In normal operation the thermal element carries continuous current with minimal temperature rise, and the magnetic element responds only to fault levels up to 14 kA at 120/240 V AC. No forced cooling is required, and the breaker adds negligible acoustic noise to the enclosure. Power dissipation stays within the limits defined by the 63 A frame size.

Highlights

  • Protects three-phase branch circuits with D-curve thermal-magnetic trip
  • 25 A rating suits motor-starting loads without nuisance trips
  • 14 kA interrupting capacity at 120/240 V AC handles high fault currents
  • Screw-clamp terminals accept 18 to 8 AWG conductors for secure connections
  • Compact DIN-rail mount fits 4.06 x 2.13 x 2.83 in footprint in standard enclosures

Specifications

BrandSCHNEIDER ELECTRIC

Questions about this item

How does the 25 A D-curve rating behave when the breaker is installed in a live panel?

The D-curve characteristic tolerates higher inrush currents typical of motor or transformer loads while still tripping on sustained overloads above 25 A.

What does the UL 489 listing and 14 kA interrupting capacity mean for a 240/480 V AC installation?

UL 489 certifies the breaker for branch-circuit protection and the 14 kA AIR rating confirms it can safely interrupt faults up to that level at 120/240 V AC.

What are the exact dimensions and wire-range requirements for fitting this unit into an enclosure?

The breaker measures 4.06 in long, 2.13 in wide and 2.83 in deep, and accepts conductors from 18 AWG up to 8 AWG via screw-clamp terminals.

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