Wholesale D165T LV Moulded Case Pole Mounted Breaker Digital Trip Unit Manufacturer, Factories

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Wholesale D165T LV Moulded Case Pole Mounted Breaker Digital Trip Unit Manufacturer, Factories

The D165T is a pole-mounted, molded-case circuit breaker engineered specifically for protecting distribution transformers on low-voltage overhead lines. This 4-pole breaker, rated at 165A and 440V, provides reliable protection against overloads, short-circuits, and phase imbalances. Housed in a weather-resistant fiberglass shell (IP31), it is built for outdoor operation from -25°C to 50°C. Featuring a digital trip unit, the D165T breaker can be precisely set to safeguard 50kVA, 100kVA, or 160kVA transformers. Its air-arc extinction technology ensures quick fault interruption, making this pole-mounted circuit breaker a robust and essential protection solution.

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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

Parameters	Circuit Breakers
Parameters	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	25/70mm²	50/150mm²
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 • H

Note: No fire, no explosion hazards, no chemical corrosion and recurrent severe vibration.

Internal Structure Diagram

Incoming Wiring Clamp: Enables direct 4-phase power connection without crimping lugs.

Incoming Wiring Hole: Provides cable access for both incoming and outgoing connections.

Arc Chute Grid: User-replaceable component for effective arc extinguishing.

Operation Mechanism: Spring-charged closing mechanism operable via floor-mounted handle.

Digital Trip Unit: Configurable for 50/100/160 kVA with embedded current transformers.

Load Indicator Trip: Orange indicator drops to trigger trip when load time is reached.

Position Indicator: Green marker shows open/closed status through protrusion length.

Operation Handle: Controls tripping (downward) and closing (upward) operations.

Load Trip Enable/Disable Handle: Activates or deactivates the load trip function.

Outline and Installation Dimension

Frequently Asked Questions

What are the primary differences between the D165T and D265T models?

The primary differences lie in the current capacity and connection configurations. The D165T offers a 165A rating, 4000A cutout power, and 1 output, while the D265T supports a 265A rating, 6400A cutout power, and 2 outputs with larger cable sections (50/150mm²).

How does the circuit breaker handle severe load imbalances?

These circuit breakers are specifically designed for MV/LV transformers in rural networks. Featuring 4 poles (three protected), they manage high load imbalances using air-break technology and metallic partition arc chutes to safely extinguish arcs and maintain total power utilization.

What power ratings can the digital trip unit support?

The digital trip unit is equipped with embedded current transformers and is configurable to support transformer ratings of 50 kVA, 100 kVA, and 160 kVA.

What environmental conditions are required for optimal operation?

The equipment is engineered to withstand ambient temperatures from -40°C to +70°C, relative humidity up to 100%, altitudes up to 2000 meters, and wind speeds up to 40 m/s, provided the site is free from explosion hazards, recurrent vibration, and corrosive chemicals.

How can operators verify whether the breaker is open or closed?

The unit includes an integrated mechanical position indicator featuring a high-visibility green marker. The status is clearly confirmed based on the visible protrusion length of the marker.

Wholesale D165T LV Moulded Case Pole Mounted Breaker Digital Trip Unit Manufacturer, Factories

Product Description

Type Designation

Technical Parameters

Product Display

Working Ambient

Internal Structure Diagram

Outline and Installation Dimension

Frequently Asked Questions

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