Acti9 iC60N vs iC60H vs iC60L: Breaking-Capacity Tiers
What separates the Acti9 iC60N, iC60H, and iC60L? All three share the same DIN-rail body, the same 18 mm per pole width, and the same 0.5-63 A current range, but each carries a different rated breaking capacity under IEC 60898-1 and IEC 60947-2 — iC60N to 6 kA (10 kA on selected references), iC60H to roughly 10-15 kA, and iC60L to approximately 15-25 kA through a current-limiting contact design. Specify the wrong tier and you either pay for headroom a final circuit never needs, or install a breaker that cannot interrupt the fault current the board can actually deliver. This article covers the breaking-capacity numbers for each tier, what prospective fault level each one suits, how iC60L's current-limiting behavior differs from the other two, price and stock reality, and a short method for reading the required tier off a fault study.
Same Footprint, Different Breaking Capacity
The three references are not separate breaker families. They are the same miniature circuit breakers body, with the internal arc-quenching and contact-separation design changed to reach a higher rated breaking capacity. Curves B, C, and D are available across all three tiers; K and Z appear on selected references within the range rather than on the full N/H/L spread. What changes between tiers, in practice, is one number on the nameplate and one line item on the price list.
iC60N: the 6 kA Baseline
iC60N is rated 6 kA under IEC 60898-1, with some references extending to 10 kA. It covers the majority of final-circuit specifications: lighting, socket outlets, and small appliance circuits fed through enough cable and transformer impedance that the prospective fault current at the board rarely exceeds a few kA. It is the volume reference in the Acti9 iC60 range and the one most panel builders reach for by default.
What we see in the field: most residential and light-commercial boards never see a fault current close to 6 kA, so an N-tier breaker covers the spec without over-buying capacity the installation will never call on.
iC60H: the Mid Tier for Tighter Boards
iC60H holds the same curve options and current range as iC60N but is rated to roughly 10-15 kA. It suits boards closer to the transformer, sub-distribution panels fed from a larger incoming supply, or specs that simply call for headroom above 6 kA without moving to a current-limiting design. The step from N to H is a breaking-capacity upgrade within the same construction family — not yet the current-limiting behavior of iC60L.
iC60L: Current-Limiting for High Fault Levels
iC60L is rated up to approximately 25 kA on lower current ratings, tapering toward 15 kA at the higher end of the range. It reaches this through contacts built to separate fast enough, within the first half-cycle of a short circuit, that the peak let-through current and the I²t energy passed downstream are reduced below the theoretical prospective values. That is the current-limiting characteristic referenced in IEC 60947-2's breaker classification.
This is a mechanical difference, not a marketing label. An iC60N or iC60H interrupts a fault after arc-quenching in the de-ion chamber does its work; an iC60L cuts the fault current down before it peaks. The consequence downstream: cable thermal stress and busbar electrodynamic forces both scale with I²t, so a current-limiting breaker upstream reduces the sizing burden on everything behind it.
How the Tier Changes Downstream Coordination
Choosing iC60L over iC60H is not only about the breaking-capacity number on the nameplate. Reduced let-through energy improves cascading toward downstream MCBs and reduces mechanical stress on busbars and cable insulation during a fault. It comes at a cost: current-limiting contacts add complexity to the mechanism, which is part of why iC60L sits above iC60H on price, not the breaking-capacity rating alone.
Not every board needs it. A final-circuit panel at the end of a long cable run rarely benefits from current limiting — the cable impedance already caps the fault current well below what an iC60N can interrupt. The tier only earns its price where the fault study actually shows a high prospective current.
Acti9 iC60N vs iC60H vs iC60L at a Glance
| Criteria | iC60N | iC60H | iC60L |
|---|---|---|---|
| Rated breaking capacity | 6 kA (up to 10 kA on select refs) | ~10-15 kA | ~15-25 kA |
| Standard | IEC 60898-1 | IEC 60898-1 (+ 60947-2 rating) | IEC 60898-1 (+ 60947-2 rating) |
| Current-limiting design | No | No | Yes |
| Curves available | B, C, D (K/Z select refs) | B, C, D (K/Z select refs) | B, C, D (K/Z select refs) |
| Current range / poles | 0.5-63 A, 1P/2P/3P/4P, 1P+N | 0.5-63 A, 1P/2P/3P/4P, 1P+N | 0.5-63 A, 1P/2P/3P/4P, 1P+N |
| Typical board | Final circuits, lighting, sockets | Sub-distribution, boards near transformer | High-fault boards, coordination-critical panels |
| Relative price / stock | Lowest, highest stock volume | Mid, common on request | Highest, lower turnover — longer lead on uncommon ratings |
Reading the Tier off a Fault Study
The tier decision is a comparison, not a guess: take the prospective fault current at the board and check it against each tier's rated breaking capacity. Boards fed by a long cable run from the transformer carry enough impedance to hold the fault current down; boards close to a large transformer, or fed by parallel transformers, do not.
Formula: Prospective fault current — Source: general fault-level calculation practice (per IEC 60909 principles)
Ipf = U / (√3 × Zf)
| Symbol | Description | Unit |
|---|---|---|
| Ipf | Prospective fault current at the point of installation | A |
| U | Nominal line-to-line voltage | V |
| Zf | Total fault-loop impedance from source to the point of installation (transformer + cable) | Ω |
Once Ipf is known, the tier choice reads directly off the table above: below roughly 6 kA, iC60N covers it; between roughly 6 and 15 kA, move to iC60H; above that, up to about 25 kA, iC60L. This is the same logic covered in more depth for the wider Acti9 and ABB ranges in our guide on how to select the right MCB, and it follows directly from the definitions laid out in MCB breaking capacity tiers explained.
Price and Availability
iC60N is the volume reference: lowest unit price in the range and the deepest stock across ratings and pole counts, because it covers most specs. iC60H sits above it — a mid-tier premium for the extra breaking-capacity margin, generally available on the common ratings without extended lead time. iC60L carries the highest unit price of the three, reflecting the current-limiting mechanism, and turnover is lower on uncommon ratings, so an uncommon amperage in iC60L can mean a longer wait than the same amperage in N or H. Stoklink carries all three tiers; check current stock and lead time by specific reference and rating before committing a board design to iC60L on an unusual amperage.
Frequently Asked Questions
Can I substitute iC60N for iC60H if I am unsure of the fault level?
Only if the fault study confirms the prospective current stays below iC60N's rated breaking capacity. Substituting without that check risks a breaker that cannot clear a real fault on that board.
Does iC60L trip at a different current than iC60N or iC60H?
No. Tripping curve (B, C, D) and rated current (In) are set independently of the breaking-capacity tier. iC60L changes how the breaker behaves once a fault occurs, not when it trips.
Is iC60L always the safer default choice?
It reduces let-through energy, but it is not free — higher unit price and, on uncommon ratings, longer lead time. Specify it where the fault study calls for it, not as a blanket upgrade on every panel.
Do iC60N, iC60H, and iC60L interchange physically on the same DIN rail?
Yes. All three share the same body dimensions and 18 mm per pole width, so a board designed for one tier accepts another without rework — only the nameplate rating and price change.
How does the iC60 range compare to Easy9 on breaking capacity?
Easy9 is Schneider's economy residential line, typically rated 4.5-6 kA with a narrower curve selection. Acti9 iC60 sits above it across all three N/H/L tiers, which is why iC60 is the specification for commercial and industrial boards rather than basic residential circuits.
Conclusion
iC60N, iC60H, and iC60L are one breaker family split across three breaking-capacity tiers — 6 kA, roughly 10-15 kA, and roughly 15-25 kA current-limiting, respectively. The choice is a lookup, not a judgment call: take the prospective fault current from the fault study, compare it against the table, and specify the lowest tier that clears it. Over-specifying iC60L on a final circuit that will never see more than 3 kA wastes budget; under-specifying iC60N on a board fed close to the transformer risks a breaker that cannot do its one job. For the broader standard behind these ratings, see our comparison of IEC 60898 vs IEC 60947 standards, and for curve selection alongside breaking capacity, see how to choose an MCB tripping curve. For the full picture across construction, curves, and standards, start from the MCB engineering guide.
