Custom printed panels are non-returnable.
Please upload the image, photo, or logo you would like printed on the LED panel.
Recommended image size:• 600 × 600 pixels or higher resolutionAccepted file formats:• JPG• PNG• PDF
Availability: Low stock: 87 left
Couldn't load pickup availability
Once you receive your order confirmation email, your order will be processed within 2–3 business days (excluding weekends and public holidays).
Installation must be carried out by a qualified electrician.
Ensure power is switched off before installation.
Suitable for indoor use.
The Live CZ3125B Triple Pole MCB is an ultra-high-capacity industrial-grade miniature circuit breaker designed to provide reliable protection for maximum-power three-phase electrical circuits with resistive loads. Rated at 125 Amps with a B-curve tripping characteristic, this 3-pole breaker safeguards 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 higher prospective short-circuit currents near main distribution points and transformers. The B-curve characteristic (3-5x In) provides fast response to faults while accommodating the minimal inrush currents typical of ultra-high-power resistive loads. With its robust construction and precision thermo-magnetic release, the CZ3125B ensures equipment protection and operational safety for the most demanding high-power applications requiring current ratings well above the standard range with enhanced interrupting capacity.
Triple Pole Protection: Simultaneously protects all three phases (L1, L2, L3) in three-phase systems, ensuring complete circuit isolation during fault conditions.
Ultra-High-Capacity 125A Rating: Provides protection for applications requiring 125A capacity, well beyond standard MCB ratings.
Enhanced 10kA Breaking Capacity: Powerful fault current interruption for installations with higher prospective short-circuit currents up to 10,000 amps.
B-Curve Characteristic: Trips instantaneously at 3-5 times rated current (375A to 625A), specifically calibrated for ultra-high-power circuits with minimal inrush.
Maximum Extended Current Range: Ideal for main distribution boards, large industrial heaters, commercial building mains, and heavy-duty resistive loads.
Industrial-Grade Protection: Suitable for demanding industrial applications requiring robust three-phase protection 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.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | CZ |
| Model Number | CZ3125B |
| Device Type | Miniature Circuit Breaker (MCB) |
| Pole Configuration | 3 Pole (3P) |
| Current Rating (In) | 125 Amperes |
| Trip Curve Type | B Curve (3-5 × 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 | 50 mm² (suitable for 125A) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 |
1. What specific applications require a 125A triple pole B-Curve MCB with 10kA protection?
Main distribution boards for large industrial facilities, high-power industrial heaters (up to 86kW), large commercial building mains, heavy-duty catering facilities, and main switchgear requiring maximum capacity with fast fault response.
2. What is the power capacity of this 125A three-phase B-Curve breaker?
Maximum resistive load: 86.5kW at 400V three-phase. Continuous load (80% rule): 69kW. Suitable for very large industrial heating applications and main distribution at maximum capacity with fast B-Curve response.
3. How does the 125A rating compare to standard industrial MCBs?
Provides 25% more capacity than 100A units and nearly double the capacity of standard 63A MCBs, making it ideal for facilities with very high power demands or future expansion requirements.
4. Why choose B-Curve over C-Curve for 125A three-phase industrial applications?
B-Curve (3-5x In) provides faster fault clearance (375-625A trip) than C-Curve (625-1250A), offering better protection for large resistive heating elements while responding to actual fault conditions more quickly.
5. What cable size is mandatory for 125A three-phase circuits?
35mm² copper conductor minimum per phase. 50mm² strongly recommended for longer runs, higher ambient temperatures, and to ensure proper termination capacity. All three phase conductors must be same size.
