Schneider Acti9 iC60 vs ABB S200 vs Siemens 5SY: MCB Comparison

Which MCB brand should you specify: Schneider Acti9 iC60, ABB S200, or Siemens 5SY? All three cover the IEC 60898-1 residential and light-commercial range from roughly 0.5-63 A in curves B, C and D, with breaking capacities running from 6 kA up to the mid-20s kA depending on the sub-range you pick. The differences that matter for a panel builder sit one level down: which curves each range actually stocks, how the breaking-capacity tiers are named and priced, what RCBO add-on exists, and how wide the accessory ecosystem runs. This article compares current range, curve availability, breaking-capacity tiers, RCBO options, DIN module width and accessories across the three ranges, then closes with a when-to-pick-which summary.

Current Range and Pole Configurations

Schneider's Acti9 iC60 spans 0.5-63 A across 1P, 2P, 3P, 4P and 1P+N configurations, with curves B, C and D as standard and K/Z available on selected references. ABB's S200 range, part of System pro M compact, covers the same 0.5-63 A band and the same pole options, but lists B, C, D, K and Z as standard curve choices across the family. Siemens 5SY, part of the SENTRON/Beta line, runs 0.3-63 A in 1-4P, with B, C and D curves; K and Z sit in Siemens' higher tiers rather than in 5SY itself.

On paper the ampere bands overlap almost completely. What separates them in a quote is the sub-range structure: Schneider and ABB both split their line into two or three breaking-capacity tiers, while Siemens 5SY is closer to a single general-purpose tier, with 5SL sitting below it as the economy option. Miniature circuit breakers in all three ranges mount on standard 35 mm DIN rail, so pole count and curve, not the rail, usually decide which reference goes in a slot.

Tripping Curve Availability

B, C and D are common to all three brands and follow the same IEC 60898-1 / IEC 60947-2 multiples: B trips at 3-5x In, C at 5-10x In, D at 10-20x In. Where the ranges split is K and Z. ABB S200P is the one range here that lists K and Z curves as catalog standard, alongside B, C and D — a genuine differentiator if a project needs semiconductor-grade protection (Z) or tight industrial motor coordination (K) without switching to a different breaker family. Schneider's Acti9 iC60 offers K/Z only on selected references rather than across the whole range, and Siemens' 5SY sticks to B, C and D. For a project that needs K or Z on most circuits, that pushes the specification toward ABB before price is even discussed.

Curve choice interacts with breaking capacity. A K-curve breaker sees short-circuit-level currents at a lower multiple of In than a D-curve one, so the same prospective fault current can trip a K-curve MCB where a D-curve version of the same amperage would not. See our MCB tripping curves breakdown for the full multiple-by-multiple comparison.

Breaking Capacity Tiers

This is where the three ranges diverge most clearly, and it is also where naming gets confusing if you only skim a price list.

Schneider Acti9 iC60 splits into iC60N (6 kA, up to 10 kA on some references), iC60H (roughly 10-15 kA) and iC60L (current-limiting, up to around 25 kA on some references, 15 kA on others). ABB S200 splits into S200 (6 kA), S200M (10 kA) and S200P (15 kA, and the tier that also carries K/Z curves). Siemens 5SY is quoted at 6-10 kA across the range, without the same three-step tier structure; if a board needs more than that, Siemens' higher-tier ranges, 5SP and 5SU, come into play rather than a 5SY sub-variant.

What we see in the field: a lot of iC60N and base-tier S200 (both 6 kA) get specified by habit even on boards close to a transformer, where the prospective fault current can already sit near 10 kA. The rule for when that habit fails is straightforward and worth restating as a formula rather than a rule of thumb.

If Ipf at a distribution board is 9 kA and the spec calls for iC60N or base-tier S200 at 6 kA, the breaker is undersized regardless of brand — the fix is iC60H/S200M/S200P, or for Siemens, a step up out of 5SY. Full tier-by-tier figures are in our MCB breaking capacity guide.

RCBO Options and DIN Footprint

Each brand offers an add-on or integrated earth-leakage version that turns the MCB into an RCBO, a combined overcurrent and residual-current device. Schneider's is Vigi iC60, an add-on module that clips onto the iC60 body. ABB's DS201 is a dedicated S200-based RCBO reference rather than a clip-on add-on. Siemens covers this with the 5SU line, its RCBO tier alongside 5SY.

The practical difference is panel space and spares logistics. A Vigi add-on lets a panel builder stock plain iC60 MCBs and Vigi modules separately, then combine them per circuit, useful when a project's RCBO count is not fixed until late in the design. DS201 and 5SU, being single references, are simpler to order and wire, but they mean holding a separate RCBO SKU per rating rather than an MCB-plus-module combination. Neither approach is wrong; it depends on whether your stock strategy favors modularity or SKU simplicity. For the broader distinction between RCBO, RCD and RCCB terminology, see MCB vs RCBO vs RCD vs RCCB.

DIN Module Width

All three ranges use the same 18 mm-per-pole module width on 35 mm DIN rail, so a 1P Acti9 iC60, S200 or 5SY occupies one module and a 3P version occupies three, regardless of brand. This is a genuine point of interchangeability at the enclosure-design stage; swapping brands mid-project rarely forces a panel resize on width grounds alone. Where footprint does diverge is depth: a Vigi-equipped iC60 circuit takes more depth than a plain MCB because of the clip-on module, while DS201 and 5SU package the RCD function into a single-depth device. Not a large difference in most enclosures, but worth checking against a shallow panel before locking a layout.

Ecosystem and Accessories

Beyond the base breaker, each range carries auxiliary contacts, shunt trips, undervoltage releases and busbar/comb systems for multi-pole distribution — the parts that actually decide whether a panel builder standardizes on one brand for a project. Schneider's Acti9 platform spans MCBs, RCBOs, contactors, timers and monitoring relays under one physical family, which simplifies busbar and auxiliary compatibility across a whole board. ABB's System pro M compact accessories cover the same categories for S200/S200M/S200P, with S800 available as a step-up when a feeder needs higher breaking capacity or amperage than S200 offers. Siemens SENTRON accessories support 5SY/5SL/5SU in the same way, with the wider SENTRON portfolio, including MCCBs and contactors, sharing family design language rather than one shared clip-on comb system in every case.

This depends on what else is on the board. A project already standardized on Acti9 contactors and timers gains more from staying with Acti9 iC60 than one where the MCB is the only Schneider device in the enclosure; in that case, availability and price often matter more than ecosystem fit.

Side-by-Side Comparison

The table below lines up the three ranges on the criteria that actually change a specification: curve availability, breaking-capacity tiers, RCBO reference, and standard basis.

When to Pick Which

For a standard commercial distribution board with B/C/D curves and 6-10 kA fault levels, all three ranges do the job, and the decision usually comes down to price, lead time and what else is already specified on the panel. For boards needing K or Z curves on more than a handful of circuits, S200P removes the need to mix breaker families. For a project already built around Acti9 contactors, timers and monitoring, staying with Acti9 iC60, and Vigi for RCBO circuits, keeps busbar and accessory compatibility simple across the whole enclosure. For projects standardized on SENTRON switchgear elsewhere, 5SY keeps the MCB tier consistent with the rest of the Siemens portfolio, with 5SU covering RCBO needs and 5SP available if a feeder needs more than roughly 10 kA.

Not always a clean split. A panel builder stocking multiple brands for supply-chain reasons will often carry iC60N or S200 base tier as the default 6 kA workhorse, and reach for the brand-specific K/Z or higher-tier reference only when the load demands it, rather than standardizing a whole board on one range. Check our MCB selection checklist for the full set of criteria beyond brand: rated current, curve, breaking capacity, poles and enclosure fit all factor in before brand does.

Standards basis is close but not identical across the three. Acti9 iC60 and S200 both carry dual IEC 60898-1/60947-2 ratings on many references, useful when a project spec calls for the higher-current industrial standard rather than the household one. 5SY is marketed under IEC 60898-1. The distinction affects which Icu/Ics figures apply, and whether K curves are even in scope; see IEC 60898 vs IEC 60947 for the full standard comparison.

Conclusion

Schneider Acti9 iC60, ABB S200 and Siemens 5SY overlap heavily on current range, pole options and DIN footprint, which is why the deciding factors sit in the details: ABB S200P is the only one of the three with K/Z curves as catalog standard, Acti9 iC60L reaches the highest top-tier breaking capacity, and RCBO strategy, Vigi's add-on modularity versus DS201/5SU's dedicated references, shapes stock and wiring decisions more than the base MCB spec does. Match curve and breaking-capacity tier to the actual load and fault current first, then let existing panel ecosystem and supply-chain preference settle the brand.