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The Live CB363D Triple Pole MCB is the highest-capacity specialized industrial-grade miniature circuit breaker in the CB series, engineered to provide reliable protection for three-phase electrical circuits with the most extreme inrush currents at maximum power levels. Rated at 63 Amps with a D-curve tripping characteristic, this 3-pole breaker represents the maximum current rating available, safeguarding all three phases (L1, L2, L3) on AC systems up to 400V at 50/60Hz frequency. It features a powerful 10kA breaking capacity, making it suitable for installations with the highest prospective short-circuit currents. The D-curve characteristic (10-20x In) is specifically designed for applications with the most extreme momentary startup currents, ensuring the breaker tolerates these massive surges while maintaining full protection against overloads and short circuits. With its robust construction and precision thermo-magnetic release, the CB363D ensures equipment protection and operational safety for the most demanding heavy industrial applications requiring three-phase protection with maximum surge tolerance at peak current ratings.
Triple Pole Protection: Simultaneously protects all three phases (L1, L2, L3) in three-phase systems, ensuring complete circuit isolation during fault conditions.
Maximum 63A Rating: Highest capacity in the CB series for three-phase applications up to 43.6kW.
High 10kA Breaking Capacity: Powerful fault current interruption for installations with highest prospective short-circuit currents up to 10,000 amps.
D-Curve Characteristic: Trips instantaneously at 10-20 times rated current (630A to 1260A), specifically engineered for applications with the most extreme inrush currents.
Peak Capacity 63A Three-Phase Protection with Maximum Surge Tolerance: Ideal for massive power transformers (up to 30kVA+), largest industrial welding equipment, mega motor-generator sets, and ultra-heavy industrial machinery with the highest startup currents.
Specialized Heavy Industrial Focus: Prevents nuisance tripping where standard B/C curves would fail due to extreme inrush at maximum current ratings.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on all three poles.
Superior Electrical Isolation: 4000V impulse withstand rating and 500V insulation voltage for protection against voltage transients.
Extended Operational Life: 8,000 electrical operations for long-term reliability.
Professional Installation: Standard 35mm DIN-rail mounting with IP20 finger-safe terminals and 16mm² wiring capacity.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | CB |
| Model Number | CB363D |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 63 Amperes (Maximum series rating) |
| Trip Curve Type | D Curve (10-20 × In) |
| Operational Voltage | 230/400V AC |
| Rated Breaking Capacity | 10kA (10000 Amps) |
| Frequency Range | 50/60 Hertz |
| Insulation Rating (Ui) | 500 Volts |
| Impulse Withstand (Uimp) | 4000 Volts (1.2/50 µs) |
| Dielectric Test Voltage | 2kV for 60 seconds |
| Protection Mechanism | Thermo-magnetic (all poles) |
| Operating Temperature | -5°C to +40°C (daily average ≤35°C) |
| Calibration Reference | 30°C |
| Storage Temperature | -25°C to +70°C |
| Electrical Lifespan | 8,000 cycles |
| Protection Class | IP20 |
| Terminal Capacity | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require the maximum 63A D-Curve triple pole MCB?
Massive three-phase power transformers up to 30kVA+, largest industrial welding equipment, mega motor-generator sets, ultra-heavy industrial machinery, and circuits where extreme inrush currents (up to 1260A) occur at maximum running currents.
2. Why choose D-Curve over C-Curve for 63A three-phase ultra-heavy industrial applications at maximum capacity?
D-Curve (10-20x In) handles inrush currents up to 1260A where C-Curve (5-10x In) would trip at 630A, making D-Curve essential for the largest transformers and heaviest welding equipment with the most extreme magnetizing inrush.
3. What transformer size can this 63A D-Curve breaker support at maximum capacity?
Suitable for three-phase power transformers up to 30kVA+, depending on inrush characteristics. The D-Curve tolerates the extreme magnetizing inrush during transformer energization without nuisance tripping.
4. What is the power capacity of this 63A maximum capacity three-phase D-Curve breaker?
Maximum resistive load: 43.65kW at 400V three-phase. For inductive applications, suitable for massive transformer and ultra-heavy welding equipment loads within the 63A running current limit at maximum capacity.
5. What cable size is MANDATORY for 63A D-Curve three-phase ultra-heavy industrial circuits at maximum capacity?
16mm² copper conductor MANDATORY per phase - this matches the maximum terminal capacity. For runs over 15m, external termination with 35mm² or 50mm² is REQUIRED. All three phase conductors must be same size. NEVER use smaller cable for 63A maximum capacity circuits.
