MCB (Miniature Circuit Breaker) and MCCB (Molded‑Case Circuit Breaker) are both overcurrent‑protection devices for low‑voltage systems, yet designed for different load levelsSchneider ....
MCBs comply with IEC 60898‑1, with rated current up to 125 A. They feature fixed thermal‑magnetic trip curves (B/C/D types), compact DIN‑rail modular structure and relatively low short‑circuit breaking capacity. They are widely used for final‑branch circuits such as lighting and socket loads in distribution boards.
MCCBs follow IEC 60947‑2, covering 10 A to 1600 A and above. Most models support adjustable thermal‑magnetic or electronic trip units, delivering much higher short‑circuit withstand capability. Auxiliary accessories like shunt trips and alarm contacts are available. MCCBs are applied for main feeders, sub‑panels and heavy‑duty industrial loads inside IEC 61439‑2 assemblies.
Key note: Do not confuse MCCB with MCC (Motor Control Center), which refers to a complete cabinet assembly rather than a circuit‑breaker component.
Quick comparison bullet points (for BOM / tender use)
- MCB: ≤125 A, fixed trip, DIN‑rail mount, final circuits, IEC 60898‑1
- MCCB: 10‑1600 A, adjustable trip, high breaking capacity, feeder & industrial loads, IEC 60947‑2