A 1A-63A thermal-magnetic miniature circuit breaker in 1P/2P/3P/4P form factors is being quoted at US$0.62 per piece FOB China for Knb2-63 series 6kA/10kA models carrying CE and CB certificates, with 100-piece MOQ [S1][S2]. Across 9 export-platform listings sampled on 2026-07-31, the bulk of commodity MCB SKUs sit in a tight US$0.53-US$1.73 band, while branded or higher-rupture units reach US$2.20 on the same platform [S1][S2][S6][S9].
The defining cost variables are short-circuit breaking capacity (Icu 6kA vs 10kA), pole count (1P through 4P), instantaneous-trip curve (B/C/D), and whether the unit carries CE, CB, SEMKO, TUV, RoHS, or CCC marks. A like-for-like MCB without CE/CB certificates is typically 10-25% cheaper than the certified equivalent, but most EU and Middle-East projects will reject non-certified product at incoming inspection [S1][S6].
Factory Price Bands on China Export Platforms (July 2026)
The lowest entry-level tier on Made-in-China.com in July 2026 sits at US$0.62 per piece for the 1A-63A 7.5kA/10kA Knb2-63 series with CE/CB certification, and US$0.72 per piece for 1P or 4P 6kA/10kA SKUs in the same family [S1][S2]. The mid-tier opens at US$0.82-US$0.90 per piece for Dz47 series 1P-4P 6kA C63 thermal-magnetic units from Changsong Electric, a Diamond Member holding IATF 16949 and ISO 14064 audit credentials [S6]. The CE/CB/SEMKO-certified 6kA 32A SKUs in the same family list at US$0.62 per piece as a 100-piece MOQ reference [S1].
A separate, higher-spec tier covers 100A 4P MCCB NSX-style thermal-magnetic breakers at US$28.00-US$32.67 per piece with 5-piece MOQ, while 500A moulded-case thermal-protection units jump to US$800.00-US$8,000.00 per piece at 1-piece MOQ [S7]. At the extreme, a "test-facility" LW36 vacuum miniature breaker is listed at US$1,500.00-US$2,000.00 per unit, indicating a different product class rather than a true MCB [S4].
What the Per-Piece Number Actually Includes
All prices in this price band are FOB China at the listed MOQ, not delivered duty-paid to the buyer's port, and they exclude copper-bus, DIN-rail, terminal lugs, and shunt/auxiliary accessories that can add 8-20% to the bill of materials on a panel-build job [S6].
Freight, certification validation, and incoming-test scrap also belong in the budget. The same logic is visible in the industrial valve market, where the ex-works price is rarely the price paid at the receiving dock.
Spec Drivers That Move the Quote
Four specs dominate the price gap on identical-looking MCBs. First, Icu breaking capacity: 6kA units (e.g. Knb2-63 6kA 1P) sit at US$0.72 while the 10kA variant in the same series lists at the same US$0.72 because the listed MOQ is high enough that the manufacturer absorbs the cost; on lower-volume runs the 10kA carries a 5-15% premium [S1].
Third, trip-curve family: B-curve (3-5x In) is the residential default, C-curve (5-10x In) is the motor and small-transformer workhorse, and D-curve (10-20x In) commands the highest premium of the three for high-inrush loads [S10]. Fourth, certification stack: a CE-marked MCB with a CB scheme test certificate (IEC 60898-1) trades at a different price tier than a UL 489 or TUV SEMKO unit, and dual-certification breakers commonly command a 20-35% premium over single-certificate SKUs [S1][S2][S10]. Specs and trip-curve logic for a true engineering selection are covered separately in this MCB selection spec map.
Core Specs That Travel With the Price
Across the GSB2-series datasheet and the Knb2-63 / DZ47-63 listings, a working MCB in 2026 typically carries rated insulation voltage 500V AC, rated impulse withstand (Uimp) 4kV, 50/60 Hz operation, terminal capacity 1-25 mm², mechanical life 20,000 operations, instantaneous-trip family C or D, and a 6kA or 10kA Icu rating [S10]. Rated currents span 1A, 3A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A in 1P, 2P, 3P, and 4P housings with rated voltage 240V AC (1P) and 415V AC (2P/3P/4P) [S10].
The compliance backbone is IEC 60898-1 for household and similar installations, with the GSB2-series datasheet explicitly citing that standard [S10]. Units carrying the CE mark under the Low Voltage Directive (2014/35/EU) and a CB test certificate to IEC 60898-1 are accepted on most EU residential and light-commercial panel-builds; industrial switchboards frequently require the additional IEC 60947-2 route, which is a different and stricter test programme [S10].
Who Should and Should Not Buy at This Price Tier
The US$0.53-US$0.90 per piece band is the right zone for panel builders, OEMs, and distributors building residential distribution boards, light-commercial load centres, motor-control centres with sub-25A branch circuits, and solar PV string-protection enclosures where the upstream short-circuit current is well below 6kA [S1][S6]. It is the wrong zone for switchboards above 100kA prospective short-circuit current, for hazardous-area installations needing ATEX/IECEx-certified enclosures, and for any application where UL 489 (North American) or IEC 60947-2 industrial certification is specified in the tender [S1][S10].
Buyers specifying a flow meter, a pressure transmitter, or other certified instrumentation in the same panel should expect similar pricing logic: the factory ex-works number is the floor, not the ceiling, and certification scope is the single biggest cost driver. The same rule of thumb applies to sourcing commodity hardware such as linear guide rails where brand, tolerance class, and preload spec move the per-metre price more than raw material cost.
MOQ, Lead Time, and Total-Cost Levers
MOQ is the second-largest cost lever after certification. Knb2-63 series 6kA/10kA MCBs are quoted at 100-piece MOQ; the Dz47 1P-4P 6kA C63 line is also 100-piece MOQ; the higher-spec 100A 4P MCCB is 5-piece MOQ; and the 500A moulded-case thermal-protection unit is 1-piece MOQ [S1][S6][S7]. Lead time on a 1A-63A 6kA MCB at 100-piece MOQ from a Zhejiang or Guangdong OEM typically runs 7-15 days for stocked SKUs and 25-40 days for custom-label or special-trip-curve builds [S1][S2][S6].
Total cost of ownership on a 10,000-piece annual MCB buy is dominated by four line items: factory unit price (about 55-65% of landed cost), freight and duty (12-18%), incoming inspection and CE/CB document validation (3-5%), and field-failure rate including nuisance tripping and warranty replacement (8-15%). Cutting the factory price by buying uncertified product is the single most expensive mistake on this cost stack, because the field-failure share balloons once non-IEC 60898-1 product is installed in a CE-marked panel [S1][S10].
Comparison of the Three Main MCB Tiers in 2026
Tier 1 commodity (Knb2-63 / DZ47-63 1A-63A 6kA, CE/CB): US$0.62-US$0.90 per piece, 100-piece MOQ, IEC 60898-1, best for residential and light-commercial panel-builds [S1][S2][S6]. Tier 2 mid-spec (CE/CB/SEMKO 6kA 32A, C-curve, audited supplier): US$0.62-US$1.73 per piece, 100-piece MOQ, IEC 60898-1 with SEMKO third-party certificate, suited to EU OEM accounts requiring dual-documented compliance [S1][S6]. Tier 3 industrial (MCCB 100A 4P 40kA 690V, thermal-magnetic): US$28.00-US$32.67 per piece, 5-piece MOQ, intended for industrial motor starters and feeder protection where 6kA/10kA MCB rupturing capacity is insufficient [S7].
For buyers sourcing a 10,000-piece residential panel order, the working number is US$0.62-US$0.85 per piece landed for a CE/CB-certified 6kA unit, not the headline US$0.53 that the lowest-cost listing shows without MOQ context [S1][S2][S6][S9]. For a 500-piece industrial MCCB order, the realistic number is US$28.00-US$32.67 per piece FOB, with the higher Icu (40kA vs 6kA) and 4P thermal-magnetic design doing the work that no commodity MCB can do at any price [S7].
Track these signals next: Zhejiang OEM factory-gate updates through the Made-in-China Diamond Member list, any change in CE/CB certification stack on the Knb2-63 family, and the IATF 16949 audit status of mid-tier suppliers like Changsong Electric, which is the single best proxy for build quality on the US$0.82-US$0.90 tier [S6].