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Model Designation Interpretation (Speculative, Based on 3VT8 Series Naming Rules)
The model “3VT8-63H102” provided by the user is a simplified version; the complete model usually contains more detailed information. The speculative meaning of each part is as follows:
| Model Segment | Speculative Meaning | Description |
| 3VT8 | Siemens SENTRON 3VT8 Series Molded Case Circuit Breaker | Discontinued, replaced by 3VA/3VM/3VC series |
| 63 | Rated Current (In): 63A | Maximum current for long-term operation at 40掳C ambient temperature |
| H | Breaking Capacity Class: Class H (50kA) | Breaking capacity classes of 3VT8 series: Class N (25kA), Class H (50kA), Class L (65kA) |
| 102 | Speculated as a combination of frame current + pole number/trip unit type | 100A frame (VT100), 2-pole configuration, Thermal-Magnetic Trip unit (TMF) |
Most Probable Corresponding Complete Models: 3VT8106-1AA03-0AA0 (3-pole, 63A, Class H breaking capacity, TMF trip unit) or 3VT8106-1AA04-0AA0 (4-pole)
- Core Specification Parameters (Based on 3VT8 100H 63A TMF)
| Parameter Item | Specification Value | Description |
| Product Type | Molded Case Circuit Breaker (MCCB) | Used for overload and short-circuit protection in power distribution systems |
| Frame Current (Iu) | 100A | VT100 frame, compatible with a maximum rated current trip unit of 63A |
| Rated Current (In) | 63A | Rated operating current at 40掳C ambient temperature |
| Ultimate Breaking Capacity (Icu) | 50kA (415/440V AC) | Class H breaking capacity, meeting the requirements of industrial power distribution systems |
| Trip Unit Type | Thermal-Magnetic Trip unit (TMF) | Overload protection (thermal element): inverse time characteristic; Short-circuit protection (magnetic element): instantaneous tripping |
| Pole Number | 3-pole or 4-pole | 3-pole is commonly used in power distribution systems; 4-pole is adopted when neutral wire protection is required |
| Rated Operational Voltage (Ue) | 400/415V AC | Suitable for three-phase industrial power distribution systems |
| Rated Insulation Voltage (Ui) | 690V AC | Compliant with IEC 60947-2 standard |
| Operating Temperature | -25C ~ +70C | Derating is required when the temperature exceeds 40C |
| Wiring Method | Front Panel Wiring | Rear panel wiring or plug-in connection is optional |
| Operation Method | Rotary Handle | Electric operating mechanism is optional for remote control |
III. Product Features and Advantages
- High Reliability: A member of Siemens SENTRON series, compliant with the international IEC 60947-2 standard.
- High Breaking Capacity: Class H 50kA breaking capacity, effectively interrupting short-circuit faults and protecting equipment safety.
- Flexible Configuration: Compatible with a variety of accessories (auxiliary contacts, alarm contacts, shunt release, undervoltage release, etc.).
- Safety Design: Lockable rotary operating mechanism to prevent misoperation; Terminal cover protection for enhanced safety.
- Compact Size: Saving switchgear space, facilitating installation and maintenance.
- Typical Application Scenarios
- Industrial Power Distribution Systems: Used as incoming/outgoing circuit breakers in distribution boxes to protect cables and lines.
- Motor Protection: Serves as protection equipment for direct starting of three-phase squirrel-cage motors, providing overload and short-circuit protection.
- Transformer/Capacitor Protection: Protecting distribution transformers and compensation capacitors to prevent fault expansion.
- Main Switch/Emergency Stop Switch: Combined with a lockable operating mechanism, used as the main switch and emergency stop control for equipment or systems.
- Building Automation: Applied in power distribution protection for lighting, air conditioning and other systems in commercial buildings and industrial plants.
- Important Notes and Alternative Solutions
- Product Status
The 3VT8 series was officially discontinued in January 2024 and fully replaced by Siemens’ new-generation 3VA/3VM/3VC series molded case circuit breakers. The 3VT8 series is no longer in production, with only limited spare parts support available.
- Recommended Alternative Models (Based on 63A, Class H Breaking Capacity, 3-pole, TMF Trip Unit)
| Alternative Series | Recommended Model | Advantages |
| 3VA1 Series | 3VA1063-3ED36-0AA0 | Higher breaking capacity (25kA→36kA), more advanced tripping technology, richer accessory options |
| 3VM Series | 3VM1063-1EA00-0AA0 | Cost-effective, suitable for basic power distribution applications, easy to install |
| 3VC Series | 3VC1063-1AA00-0AA0 | Thermal-magnetic and electronic trip units optional, high intelligence level, supporting communication functions |
- Precautions for Use
- Derating Operation: When the ambient temperature exceeds 40°C, the rated current must be derated according to the temperature coefficient.
- Accessory Matching: Pay attention to matching the accessory with the circuit breaker model and pole number when selection, such as the voltage level of the shunt release.
- Installation Specifications: Ensure installation in a switchgear that meets requirements, with proper ventilation and heat dissipation maintained.
- Regular Maintenance: Periodically inspect the circuit breaker appearance, operating mechanism and trip unit performance to ensure reliable operation.
- Replacement Suggestion: For new projects, it is recommended to directly select 3VA/3VM/3VC series alternative products to achieve better performance and a longer service life.
