Product Overview
Schneider Electric Multi 9 C60 D-Curve 8A Two-Pole DIN Rail Breaker, Part 24521
Condition
Used, clean, and in excellent condition. The white molded case is bright with no cracks, discoloration, or heat marking visible in the photos, and the printed front legend reads clearly: the Schneider Electric wordmark and green stripe, D 8A, 480Y/277V, C60, Multi 9, and 24521. Both toggles sit in the 0 - OFF position and share a common trip bar across the two poles. The four Pozidriv terminal screws are bright with light driver contact on the crosses. The right side of the case carries the molded Merlin Gerin name and Made in FRANCE, and the opposite side carries the full ratings legend. This is a used unit sold as-is on the photos, not bench tested. Stock is three pieces and the breaker is sold each; the piece photographed is representative of the group.
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Product Overview
Part 24521 is a Schneider Electric Multi 9 C60 miniature circuit breaker in the two-pole, one-module-per-pole DIN rail format that fills panels across commercial and industrial plants. The front legend reads D 8A over 480Y/277V, so this is the D tripping curve at 8 amps - the curve specified where inrush is expected, such as transformer and motor feeds, rather than the softer C curve used on general lighting and receptacle circuits. The two poles are mechanically linked so both open together on a trip or a manual throw. The molded Merlin Gerin name on the case side is the original Multi 9 lineage, carried forward under the Schneider Electric brand after the acquisition, and it is why the same device shows up in the field under both names. Terminals are clamp-style screw connections; the side legend calls for copper conductors only.
Key Features
- Front legend: D 8A, 480Y/277V, C60, Multi 9, 24521
- Tripping curve: D, per the front marking
- Poles: two, with a common linked trip bar
- Mounting: standard DIN rail clip, two modules wide
- Side legend as printed: SC.10kA C1 240V and SC.5kA C1 480Y/277V
- Side legend as printed: CatA, Ics=75%Icu, Ue=240V Icu=20kA, Ue=415V Icu=10kA, Uimp=6kV
- Side legend as printed: SUPPL PROT, MAX 300V to ground, IEC 60947-2, 50/60Hz
- Wiring per side legend: CU ONLY, 75 C copper wire, terminal torque 22 lbf.in (2.5 N.m)
- Case markings: Merlin Gerin, Made in FRANCE
- Brand catalog reference on the listing: EAN 0785901881193
- Sold each - stock is three pieces
Applications
- Plant electrician replacing a failed 8A pole pair in an existing Multi 9 panel without redoing the DIN rail layout
- Machine builder feeding a small control transformer that draws enough inrush to nuisance-trip a C curve device
- Maintenance tech keeping a legacy Merlin Gerin distribution board matched to its original nameplate
- Controls integrator stocking a two-pole 480Y/277V branch device as a spare for a retrofit cabinet
Frequently Asked Questions
What does the D 8A marking on the front mean?
D is the tripping curve and 8A is the current rating, both printed on the case. A D curve tolerates a higher instantaneous surge before it trips than a C curve at the same amperage, which is why it gets specified on transformer and motor loads. Match the curve letter as well as the amps when you replace a breaker - a C for a D is not a like-for-like swap.
Is this one pole or two?
Two. The photos show two toggles joined by a single trip bar, four terminal screws, and a two-module-wide body, so both poles make and break together.
What ratings are actually printed on the breaker?
The front reads D 8A and 480Y/277V. The side legend, transcribed from the photo, reads SC.10kA C1 240V, SC.5kA C1 480Y/277V, SUPPL PROT, MAX 300V to ground, CatA with Ics=75%Icu, Ue=240V Icu=20kA, Ue=415V Icu=10kA, Uimp=6kV, IEC 60947-2, 50/60Hz, and CU ONLY with 75 C copper wire at 22 lbf.in terminal torque. We are quoting the case, not a datasheet - confirm the current Schneider documentation for 24521 against your application before you install it.
Has it been tested or exercised?
No. We describe what the case and markings show and nothing more. Trip timing, continuity, and mechanical operation are not confirmed here - verify on your bench or with your test set before the breaker protects anything that matters.
What am I actually getting for a used breaker like this?
One two-pole Multi 9 C60 marked D 8A, 480Y/277V, part 24521, in the condition the photos show: clean case, legible legend, bright terminal screws, toggles in the off position. It is a used device sold as-is, not tested and not reconditioned, and the photos are the spec - the risk you are taking on is that trip performance is unverified, which is why a surplus breaker costs a fraction of a new one. If your job can absorb a bench check before it goes in a live panel, that trade works in your favor; if it cannot, buy new. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Merlin Gerin molded the name into one side and Schneider printed theirs on the front, which tells you exactly where this little breaker sits in the story - French-built, renamed, still doing the one job it was made for. Give it a bench check and it can go back to holding an 8 amp pair steady through inrush.
