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Application Scenarios
On a regional water-pumping station running six 11 kW centrifugal pumps, the original control-panel design had used DIN-mounted fuse holders on the 230 V AC auxiliary branch (panel fans, SOV coils, local HMI, tower light). Every time a contractor re-lamped the tower or a SOV coil shorted, the fuse holder needed a new 10 A gG — and the spare drawer never had the right ampere rating because three different fuse speeds had crept in over the years. The retrofit swapped all six panels to the 2ML-C42A-CC on the 42 A feeder that feeds the auxiliary DIN row’s own 6 A branch MCBs (yes, selective coordination: 2ML-C42A-CC as the row’s parent, 6 A B-curve children). The C-curve on the 2ML-C42A-CC shrugged off the pump-motor contactor’s 230 V control-transformer inrush without nuisance, but still cleared a dead short on the HMI 24 V PSU primary in one cycle. Post-change, the “aux loss — fuse blown” callouts dropped from ~6 per quarter to zero over 12 months, and the electrician’s van stopped carrying three brands of 10 × 38 fuses. For any panel still running fusible blocks on the auxiliary feed, the 2ML-C42A-CC is usually the 15-minute upgrade that pays back in the first nuisance event it avoids.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 2ML-C42A-CC |
| Manufacturer | ABB |
| Product Category | Miniature Circuit Breaker (MCB), C-curve |
| Rated Current | 42 A (C-type trip characteristic) |
| Rated Voltage | 230/400 V AC |
| Breaking Capacity | 6 kA @ 400 V AC |
| Pole Configuration | 2-pole (CC suffix convention) |
| Trip Mechanism | Thermal (overload) + Magnetic (short-circuit) |
| Mechanical Life | 20,000 operations |
| Electrical Life | 10,000 operations |
| Operating Temperature | -25 °C to +70 °C |
| Protection Class | IP20 (DIN-rail mounted, inside enclosure) |
| Mounting | 35 mm DIN rail, snap-fit |
| Certifications | IEC 60898-1, UL 489 |
Technical Principles and Innovative Values
- Innovation Point 1: C-Curve Tuned Between “Twitchy” and “Lazy.” B-curve trips at 3–5 × In (too sensitive for motor-control aux), D-curve at 10–20 × In (too forgiving for general wiring). The 2ML-C42A-CC lands at C-curve (5–10 × In), which is the sweet spot for pump/fan DOL starters, transformer primary feeds, and mixed-load control panels where you want the short cleared fast but the inrush tolerated.
- Innovation Point 2: 18 mm Width with Dual-Break & Silver-Plated Contacts. The 2ML-C42A-CC packs a dual-break arc-chute into the 18 mm envelope, and the moving contacts are silver-plated to hold contact resistance down (~15 μΩ class). In a vibrating MCC bay, that means less heating at 42 A continuous and a longer “feel” life before the toggle gets sloppy.
- Innovation Point 3: DIN Snap-Fit + Finger-Safe Cage Clamp. The 2ML-C42A-CC lands on 35 mm rail without tools and uses the same cage-clamp / screw-hybrid terminal pattern as the rest of ABB’s S200/SH200 family, so a panel builder doesn’t need a new crimp die or a different torque sheet when mixing 2ML-C42A-CC with S200 branches on the same row.
