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10KA Miniature Circuit Breaker TDM3-125
Technical Data
| Standard | IEC60947-1 |
| Rated current (In) | 406380100125A |
| Poles | 1P2P 3P4P |
| Rated voltage(Ue) | 1P:240/415V~ 2/3/4P:415~ |
| Insulation voltage(Ui) | 500V |
| Rated frequency | 50/60Hz |
| Rated breaking capacity(Icn) | 6KA/10KA |
| Rated operating short circuit breaking capacity (lcs) | 6KA/7.5KA |
| Energy limiting class | 3 |
| Tripping curve | C D |
| Electrical and Mechanical life | 8000 |
Overload Current Protection Characteristics
| Rated Current (A) |
Test Procedure |
Test Current | Initial State | Tripping or Non-riping Time Limit |
Expected Result | Remark |
| 80A 100A 125A |
A | 1.05In | cold | t≤2h | no tripping | |
| B | 1.3ln | After testA | t≤2h | The current steadily nise to thespecified value within 5s | ||
| C | 2.55In | cold | 1s<t<120s | tripping | ||
| D | 8ln | cold | t≤0.2s | no tripping | Turn on the auxiliary switch to close the current |
|
| 12ln | t<0.2s | tripping |

Installation
| Protection degree | IP20 |
| Reference temperature for setting of thermal element | 30℃ |
| Ambient temperature | -25~+40℃ |
| Storage temperature | -25~+70℃ |
| Terminal connection type | Cable/Pin -type busbar |
| Terminal size top/bottom for cable | 50mm² |
| Tightening torque | 3.5N.m |
| Connection | Top and bottom |
Combination with accessories
| Auxillary contact | YES |
| Alarm contact | YES |
| Shunt release | NO |
| Under voltage release | NO |
Overall and mounting dimensioned chart

Product Overview
A 125A miniature circuit breaker (MCB) is a critical protection device used in electrical distribution systems, specifically designed for high-current circuits. It integrates dual functions of overload protection and short-circuit protection. When the current in the circuit exceeds the rated value (e.g., due to overload) or experiences a severe short-circuit fault, it can quickly and reliably automatically cut off the power supply, effectively preventing conductor overheating, equipment damage, and electrical fire hazards.
Key Features
The core function is clear: it is mainly used for overload and short-circuit protection of power lines and electrical equipment in buildings. At the same time, it can realize non-frequent on-off operations of circuits under normal power supply conditions, taking into account protection and basic control needs.
Clear adaptation system parameters: Applicable to power distribution systems of specific specifications. Specific parameters are as follows:
Rated voltage: 240/415V
AC frequency: 50/60Hz
Rated current: up to 125A
Rated short-circuit breaking capacity: 6KA, can effectively deal with short-circuit faults and ensure system safety.
Excellent design and compliance: The modular design facilitates installation, maintenance, and expansion. It complies with the IEC60947-2 standard, meeting international safety and performance specifications, and its product quality is supported by clear standards.
Outstanding performance and structural advantages: It has reliable operating performance, high protection accuracy, can accurately identify faults such as overload and short circuit and take timely action; at the same time, it has a compact structure, saving installation space.
Wide range of application scenarios: With the above characteristics, it is widely applicable to lighting distribution systems in industrial and commercial fields and has strong adaptability.
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Modular DIN Rail Products
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