When a molded case circuit breaker (MCCB) beats a miniature (MCB): higher current, adjustable trips, and selective coordination.
Both MCBs and MCCBs protect against overcurrent, but they live at different points in the installation. The miniature breaker handles final circuits; the molded case breaker handles the feeders that supply those circuits. Knowing where the line sits saves money and prevents whole-board blackouts.
MCBs top out around 125 A; MCCBs start where MCBs end and run to 1600 A and beyond. If the feeder you are protecting exceeds ~100–125 A, you are in MCCB territory by default. A 100 A MCCB also occupies less rail space than a stack of paralleled MCBs that would be wrong anyway.
An MCB's trip curve is fixed by type; an MCCB's thermal and magnetic thresholds are adjustable, so you can set it to coordinate with the downstream MCBs — the MCCB trips only for a feeder fault and leaves the branch breaker to clear a local one. That selectivity keeps a fault in one sub-board from dropping the whole installation.
| MCB | MCCB | |
|---|---|---|
| Role | Final circuit / branch | Feeder / main incomer |
| Range | ~0.5–125 A | ~10–1600 A |
| Trip | Fixed type | Adjustable |
| Selectivity | Limited | Designed-in |
For a main incomer or a sub-board feeding many MCB branches, specify an MCCB with adjustable settings. For the individual circuits off that board, use MCBs.
ELEHPD MCCBs, MCBs, busbar and isolators let you build a coordinated feeder-and-branch board.
Once the protected feeder exceeds about 100-125 A you are in MCCB territory: they run from roughly 10 A to 1600 A and beyond, with adjustable thermal and magnetic settings that coordinate with downstream MCBs.
Selectivity: the MCCB can be set to trip only for a feeder fault and leave branch breakers to clear local ones, so a fault in one sub-board does not black out the whole installation.
No — paralleled MCBs do not share current reliably and defeat protection coordination. A single MCCB also occupies less rail space than the equivalent stack of breakers.
Send the ratings, dimensions and quantities you are working to and we will confirm the closest match from the ELEHPD catalogue, the compliance documents available for it and the lead time. OEM branding, private model numbering and buyer-specific cartons are available on qualified volumes.