Claire
Mr.Fu
Claire
China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory
Type Designation
LV Pole Mounted Circuit Breakers
The protection and management of MV/LV transformers in rural areas requires the use of specific circuit breakers adapted to significant load imbalances, and thus guarantees complete power usage even in unbalanced conditions. These devices (4 poles, three of which are protected) use air-break technology with chambers with metal partitions to cut the arc. Low voltage pole mounted circuit breaker D165T with a digital trip unit.
Technical Parameters
| Circuit Breakers | ||
| D165T | D265T | |
| Reference Standard | NH63-S-11 | NH63-S-11 |
| Voltage Rating Current Rating |
440V 165A |
440V 265A |
| Cutout Power Closing Power |
4000A 6800A |
6400A 11700A |
| Number of Poles Number of Outputs |
4 1 output |
4 2 outputs |
| Cable Sections | 25/70mm*2 | 50/150mm*2 |
| Breakdown Voltage · Pulse/Earth · At 50Hz · Between Poles |
20KV 10KV 4KV |
20KV 10KV 4KV |
| Control System | Manual | Manual |
| Installation | On Post | On Post |
Product Display
Working Ambient
- 🌡️ Temperature: -40°C ~ +70°C
- 💧 Humidity: 100%
- ⛰️ Altitude: ≤2000m
- 💨 Wind Speed: ≤40m/s
Note: No fire, no explosion hazards, no chemical corrosion and recurrent severe vibration.
Internal Structure Diagram
- 1Incoming Wiring Clamp: Enables direct 4-phase power connection without crimping lugs.
- 2Incoming Wiring Hole: Provides cable access for both incoming and outgoing connections.
- 3Arc Chute Grid: User-replaceable component for effective arc extinguishing.
- 4Operation Mechanism: Spring-charged closing mechanism operable via floor-mounted handle.
- 5Digital Trip Unit: Configurable for 50/100/160 kVA with embedded current transformers.
- 6Load Indicator Trip: Orange indicator drops to trigger trip when load time is reached.
- 7Position Indicator: Green marker shows open/closed status through protrusion length.
- 8Operation Handle: Controls tripping (downward) and closing (upward) operations.
- 9Load Trip Enable/Disable Handle: Activates or deactivates the load trip function.
Outline and Installation Dimension
Frequently Asked Questions
What is the main application of LV pole mounted circuit breakers like D165T and D265T?
LV pole mounted circuit breakers such as the D165T and D265T are primarily used for the protection and management of MV/LV transformers in rural areas. They are specifically designed to handle significant load imbalances and ensure complete power distribution even under unbalanced conditions.
What is the difference between the D165T and D265T models?
The D165T is rated at 165A with a cutout power of 4000A and supports 1 output, with cable sections of 25/70mm². The D265T is rated at 265A with a higher cutout power of 6400A and supports 2 outputs, with cable sections of 50/150mm². Both models share the same voltage rating (440V) and reference standard (NH63-S-11).
What technology does the D165T use to extinguish the arc?
The D165T uses air-break technology combined with arc chute chambers featuring metal partitions to effectively cut and extinguish the arc during switching operations. The arc chute grid is a user-replaceable component for easy maintenance.
What are the working ambient conditions for these circuit breakers?
These circuit breakers are designed to operate in a wide range of ambient conditions: temperatures from -40°C to +70°C, humidity up to 100%, altitude up to 2000m, and wind speeds up to 40m/s. They should not be installed in environments with fire hazards, explosion risks, chemical corrosion, or severe recurring vibrations.
What is the function of the Digital Trip Unit in the D165T?
The Digital Trip Unit in the D165T is configurable for transformer ratings of 50/100/160 kVA and includes embedded current transformers. It monitors load conditions and triggers a trip function when the preset load time is reached, indicated by an orange load indicator dropping into the trip position.
How is the D165T circuit breaker installed and operated?
The D165T is designed for on-post (pole mounted) installation. It is controlled manually via an operation handle — pushing downward triggers tripping, while pushing upward closes the breaker. The spring-charged closing mechanism can be operated via a floor-mounted handle, and the load trip function can be enabled or disabled using a dedicated handle.