Wholesale China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory Suppliers, Company
Wholesale China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory Suppliers, Company
Wholesale China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory Suppliers, Company
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Wholesale China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory Suppliers, Company
Wholesale China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory Suppliers, Company
Wholesale China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory Suppliers, Company

Wholesale China D165T LV Moulded Case Pole Mounted Breaker - 165A Digital Trip Unit Supplier & Factory Suppliers, Company

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The D165T is a premium pole-mounted, molded-case circuit breaker specifically designed for safeguarding distribution transformers on low-voltage overhead lines. This robust 4-pole circuit breaker, rated at 165A and 440V, offers reliable protection against overloads, short-circuits, and phase imbalances. Enclosed in a weather-resistant fiberglass shell with an IP31 rating, it is engineered for outdoor operation in temperatures ranging from -25°C to 50°C. Equipped with a digital trip unit, the D165T can be precisely configured to protect transformers with power ratings of 50kVA, 100kVA, or 160kVA. Its advanced air-arc extinction technology ensures rapid fault interruption, making this pole-mounted circuit breaker an essential protective solution. As a leading manufacturer in China, we supply high-quality circuit breakers from our factory, ensuring reliable performance and durability for all your electrical protection needs.

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Product Description

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

Digital Trip Unit
LV Pole Mounted Breakers

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

D165T-2
  • 1 Incoming Wiring Clamp: Enables direct 4-phase power connection without crimping lugs.
  • 2 Incoming Wiring Hole: Provides cable access for both incoming and outgoing connections.
  • 3 Arc Chute Grid: User-replaceable component for effective arc extinguishing.
  • 4 Operation Mechanism: Spring-charged closing mechanism operable via floor-mounted handle.
  • 5 Digital Trip Unit: Configurable for 50/100/160 kVA with embedded current transformers.
  • 6 Load Indicator Trip: Orange indicator drops to trigger trip when load time is reached.
  • 7 Position Indicator: Green marker shows open/closed status through protrusion length.
  • 8 Operation Handle: Controls tripping (downward) and closing (upward) operations.
  • 9 Load Trip Enable/Disable Handle: Activates or deactivates the load trip function.

Outline and Installation Dimension

D165T-3

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.

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