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Hitachi Industrial Technology (Thailand), ltd.

Miniature Circuit Breakers (MCB)


MCB is applicable to electric circuit with rated voltage 230/400V, 240/415V AC, frequency 50/60Hz and rated current is up to 63A. The product provides against overload and short circuit and equipment in household and commercial installations. MCB is also used as non-frequent changeover of electric circuit.

Type and Model


BK63 Series BTK63 Series Alarm Switch (for BK63) Auxiliary Switch

Tripping Characteristics

Type B
Instant tripping characteristics: 3–5
In Application: computers and electronic equipment.
Type C
Instant tripping characteristics: 5–10
In Application: general load such as bulbs, motors.
Type D
Instant tripping characteristics: 10–20
In Application: high current surge device such as transformers, motors with heavy load.


CE Marking CB Certificate

Colored Handles

Easy to distinguish the rated current of the MCB by means of colored handle.

1A Black 20A Blue
2A Pink 25A Yellow
3A Pink 32A Purple
4A Brown 40A Black
6A Green 50A White
10A Red 63A Cupper-colored
16A Gray

(In case of RCCB, Black color only is available)


Type BK63 BTK63
Protection Overload and short circuit
Rated current 1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63A
Characteristics B, C, D curve
Number of poles 1P, 1P+N, 2P, 3P, 3P+N, 4P
Breaking capacity 1P 2, 3, 4P 1P 2, 3, 4P
6kA 6kA 10kA 10kA
Rated violtage 230/400VAC 400VAC 240/415VAC at 415VAC
Standards IEC60898
Approval SEMKO CB scheme KEMA CB scheme
Type of trip Thermal magnetic release
Electrical endurance (time) 6,000 operations 8,000 operations
Installation 35mm DIN rail
Width 17.8mm per pole
Type of terminal Lug type (Cable up to 25mm2 )
Alarm switch 1 changeover contact
6A at 230VAC, 3A at 415VAC (AX)
6A at 230VAC, 3A at 415VAC (AL)
2A at 48VAC, 1A at 125VAC (AX)
Lug terminal
Cable capacity 2.5 mm2
9mm wide
Not applicable
Dimension (mm)