AIR CIRCUIT BREAKERS - Electrical and Electronics Division

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Number of poles 3 3
Max. rated current, ln (max. rated operational current, le)
Plant protection A 25 63
Motor protection A 25 52
Permissible ambient temperature
at full rated current °C -20 to +55
in storage °C -50 to +80
Rated operational voltage, Ue V 415
Rated frequency Hz 50/60
Rated insulation voltage, Ui V 660
Utilization category
to IEC 947-2 (circuit breaker) A
to IEC 947-4-1 (motor starters) AC-3
Rated short circuit breaking capacity, Icu/Ics See Selection Table
DC short circuit breaking capacity Time constants for MG1/MG2: t=5ms
DC 125V 1pole kA - 10
DC 150V 1pole kA 10 -
DC 250V 2pole in series kA - 10
DC 300V 2pole in series kA 10 -
DC 375V 3pole in series kA - 10
DC 450V 3pole in series kA 10 -
Shock resistance to IEC 68, part 2 - 27 g 25 30
Mechanical endurance upto 25A / 25A upwards op. Cyls 100 000 100 000 / 30 000
Temperature compensation to IEC 947-4-1 Yes
Suitability for Isolation Yes
Rated impulse withstand voltage, Uimp V 6kV 8kV
Phase failure sensitivity to IEC 947-4-1 Yes
Terminal Capacity
Cross-sections for main conductors Solid or Stranded mm2 2 x (1 to 6) 1 x 1.5 to 2 x 16
or 1 x 25 + 1 x 10
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TECHNICAL DATA
TECHNICAL DATA : MPCB TYPE MG1 & MG2
Standards
IEC 947-1; IEC 947-2; IEC 947-4-1
MG1
MG2