Selecting the right high-breaking capacity MCB depends on current rating, voltage, and application type. For industrial environments, an MCB with a higher short-circuit breaking capacity (e.g., 6kA or 10kA) is ideal, while residential circuits typically require a lower rating (e.g., 4.5kA).
OOHMAGE OMB4-125 High-Capacity Circuit Breaker – Reliable AC Protection
The OOHMAGE OMB4-125 High-Capacity Circuit Breaker (MCB) is a reliable AC circuit protection device, designed to prevent overloads and short circuits in residential, commercial, and industrial applications. With rated voltages up to 400V and a current capacity of up to 125A, it ensures stable and long-term electrical safety.
Ideal for lighting systems, electric motors, and industrial machinery, this high-capacity circuit breaker complies with IEC 60898-1 and IEC 60947-2 safety standards, providing efficient, durable, and secure circuit protection.
Features
- Wide Voltage & Current Range – Supports 230V/400V ~ 240V/415V, up to 125A.
- Thermal-Magnetic Protection – Prevents short circuits and overloads.
- Occasional Switching Use – Suitable for infrequent circuit switching.
- Durable Design – 10,000 mechanical cycles and 6,000 electrical cycles.
- Industry Compliance – Meets IEC 60898-1 and IEC 60947-2 safety standards.
- Compact & Easy Installation – Quick DIN rail mounting for seamless integration.
Applications
✔ Residential: Safeguards lighting circuits, household appliances, and electrical infrastructure.
✔ Commercial: Protects office buildings, retail stores, and motorized systems.
✔ Industrial: Ensures safe power distribution in factories and control panels.
The OOHMAGE OMB4-125 High-Capacity Circuit Breaker provides advanced electrical protection, ensuring safety, durability, and efficiency in high-performance AC applications.
Specification:
| Number of poles | 1P,2P,3P,4P |
| Rated Current | 80A, 100A, 125A |
| Breaking Capacity | 6000A |
| Rated Voltage | 230V/400V~ 240V/415V~ |
| Trip Unit Technology | Thermal-magnetic |
| Curve Code | C, D |
| [Uimp] Rated Impulse | 4000V |
| Mechanical Durability | 10000 cycles |
| Electrical Durability | 6000 cycles |
| Tightening Torque | M7 3. .5N. mIl |
| Endurance | C 20000 |
| Circumstance Temperature | -5°C~+40°C |
| Protection Degree | IP20 |
Characteristic Curve
Dimensions
FAQ
How do I install a DIN rail-mounted MCB safely?
A DIN rail-mounted MCB is designed for quick and secure installation in distribution panels. To install:
- Turn off the main power supply.
- Secure the MCB onto the DIN rail.
- Connect the wiring (input at the top, output at the bottom).
- Ensure proper torque on the terminals to prevent loose connections.
- Restore power and test the circuit.
What is the difference between B, C, and D curve MCBs?
- B Curve MCB – Trips at 3–5 times the rated current, ideal for residential lighting and appliances.
- C Curve MCB – Trips at 5–10 times the rated current, suitable for commercial and industrial loads like motors and transformers.
- D Curve MCB – Trips at 10–20 times the rated current, used for heavy-duty industrial equipment with high inrush currents.
Why is a thermal-magnetic trip unit important in an MCB?
A thermal-magnetic trip unit provides dual protection:
- The thermal mechanism responds to overload conditions, preventing overheating.
- The magnetic trip unit reacts to short circuits, ensuring instant disconnection to protect electrical systems.
What is the difference between a single-pole and a three-pole MCB?
- A single-pole MCB is used for single-phase circuits (230V), protecting lighting and household wiring.
- A three-pole MCB is designed for three-phase circuits (380V–415V), commonly used in industrial machinery and power distribution systems.
How do I choose the right high-breaking capacity MCB for my application?
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