125 Amp MCB AC 415V Thermal Magnetic Breaker 10kA

Engineered for robust AC power protection, this 125 amp mcb provides precise isolation against catastrophic overloads and short circuits in low-voltage networks. The ETM1-125 high-current miniature circuit breaker operates seamlessly up to 415V AC, delivering up to 10kA breaking capacity to securely protect commercial distribution panels, heavy machinery, and critical electrical infrastructure.

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ModelETM1-125
AvailabilityIn stock
  • CE & TUV certified
  • Worldwide shipping
  • OEM & ODM support

Product Features of the 125 Amp MCB

Constructed from environmentally resilient materials, this 125 amp mcb utilizes an advanced electro-magnetic tripping mechanism to guarantee swift fault interruption.

  • High Breaking Capacity: Delivers a rated ultimate short-circuit capacity (Icu) of up to 10kA, decisively clearing severe fault currents in heavy-duty setups.
  • Touch-Safe Terminals: Features IP20 finger-protected incoming and outgoing terminals, securing live parts from accidental contact during active maintenance.
  • Heavy-Duty Wiring Accommodation: Supports massive cable cross-sections up to 35mm² (flexible) or 50mm² (rigid) to handle continuous 125a circuit breaker loads effortlessly.
  • Immediate Status Recognition: Integrates a prominent red/green indicating device directly on the faceplate to visually confirm exact contact positions instantly.
  • Versatile Trip Curves: Offers a standard 8In-12In instantaneous trip, with optional L (6In-10In) and K (10In-14In) curves to match specific industrial motor loads.

ETM1-125 Configuration & Design Tips

The ergonomic miniature circuit breaker din rail mountable shell incorporates structural enhancements to simplify B2B installation and long-term facility maintenance.

125 Amp MCB Product Tips

  1. Reversible Connection: Designed to support bidirectional line and load terminal routing for highly flexible industrial panel configurations.
  2. Handle Lock Position: Specifically molded slot to safely secure the toggle with a mechanical padlock during vital line maintenance.
  3. Amperage Visibility: High-contrast front printing explicitly indicating the continuous rated current up to 125A.
  4. Status Window: Clear red/green mechanical contact position indicator for instant fault recognition.

Commercial Applications for the 125 Amp MCB

Deploying the ETM1-125 secures vital distribution nodes, acting as a highly dependable thermomagnetic circuit breaker for massive commercial installations.

Applications & Use Cases

  • Industrial Machinery: Functions as the primary 3 phase 125 amp breaker, safeguarding heavy manufacturing equipment against motor-induced overcurrents.
  • Commercial Lighting Networks: Controls and isolates extensive lighting circuits within high-rise office buildings and large retail complexes.
  • Residential Power Systems: Operates as a formidable thermal and magnetic circuit breaker in main consumer units, protecting entire domestic distribution systems from overload damage.

Technical Specifications with the 125 Amp MCB

Evaluate the precise thermal and magnetic tolerances below to seamlessly integrate this 125 amp mcb into your high-capacity AC distribution panels.

General, Electrical & Mechanical Data

General & Technical Data (IEC/EN 60947-2)
Electrical Parameters
Model / Series ETM1-125 / ETM1-125H (High Capacity)
Protection Overcurrent and short circuit Type of trip Thermal-magnetic
No. of poles 1P, 2P, 3P, 4P Rated frequency 50/60Hz
Rated operational voltage (Ue) 1P: 230/400V~ (240/415V~) | 2P, 3P, 4P: 400/415V~ AC
Rated current (In) 63, 80, 100, 125A
Rated insulation voltage (Ui) 690V Rated impulse withstand (Uimp) 6kV (1.2/50μs)
Ultimate short-circuit capacity (Icu) 6kA (ETM1-125) 10kA (ETM1-125H)
Service short-circuit capacity (Ics) 6kA (ETM1-125) 7.5kA (ETM1-125H)
Mechanical & Installation Data
Electrical / Mechanical life 4,000 Cycles / 10,000 Cycles Protection degree IP20
Terminal connection type Cable / Pin-type busbar Max. tightening torque 3.5 N.m
Max. terminal size for cable 35mm² flexible / 50mm² rigid
Operating ambient temp. -5°C ~ +40°C Fire resistance (glow-wire) 960±15°C (Enclosure)

Tripping Characteristics

The instantaneous tripping parameters adapt perfectly to high-load environments utilizing an industrial 125 amp circuit breaker configuration.

125 Amp MCB Tripping Characteristic Curve

Tripping Characteristic Rules
Thermal Tripping (Overload) 1.05In: no tripping within 2h | 1.30In: tripping within 2h
Overload Interruption Time I = 2.55In, 1s < t < 120s (For In = 63-125A)
Instantaneous Tripping (Default) 8In – 12In
Instantaneous Tripping (Optional) L curve: 6In – 10In | K curve: 10In – 14In

Temperature Derating Table

Utilize the correction factors below to accurately adjust the continuous rated current based on ambient installation temperatures.

Rated Current (A) Correction Factor for Ambient Temperature
-40°C -30°C -20°C -10°C 0°C 10°C 20°C 30°C 40°C 50°C 60°C 70°C
63 84 81.3 78.6 75.7 72.7 69.6 66.4 63 59.4 55.6 51.4 47.0
80 106.4 103.2 100.0 96.0 92.0 88.8 84.0 80 75.2 70.4 65.6 60.0
100 133.0 129.0 125.0 120.0 115.0 111.0 105.0 100 94.0 88.0 82.0 75.0
125 166.3 161.3 156.3 150.0 143.8 138.8 131.3 125 117.5 110.0 102.5 93.8

Dimensions and Wiring of the 125 Amp MCB

Verify the exact modular footprints and heavy-duty terminal spacing below to guarantee perfect panel fitment for this 125 amp mcb.

Wiring Diagram

125 Amp MCB Wiring Diagram

Dimension (mm)

125 Amp MCB Dimension

Physical & Mounting Specifications

Poles Configuration Width (mm) Height (mm) Total Depth (mm)
1P 26.8 ± 0.2 88 mm 76.8 ± 0.3
2P 53.5 ± 0.2 88 mm 76.8 ± 0.3
3P (125 amp 3 pole breaker) 80.3 ± 0.2 88 mm 76.8 ± 0.3
4P 107 ± 0.2 88 mm 76.8 ± 0.3
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