JUNW D165T/D265T Digital-triggered Pole Circuit Breaker with Block

D165T/D265T Pole-Mounted Circuit Breakers (Upgraded with Shunt Trip Unit)
1.Upgraded Core Design & Compliance
The D165T and D265T are enhanced 4-pole (3 protected poles) air-insulated disconnectors with a metal baffle arc-quenching chamber, now integrated with an advanced shunt trip unit for smarter control. Encased in a wind and rain-resistant glass fiber reinforced polyester enclosure, they fully comply with the HN 63-S-11 standard and are purpose-built for pole-mounted outdoor power distribution.
2.Tailored Electrical Specifications
Both models operate at 440V rated voltage with differentiated performance:
•D165T: 165A rated current, 4000A breaking capacity, 6800A making capacity, 1 output, supporting 25/70 mm² cables.
•D265T: 265A rated current, 6400A breaking capacity, 11700A making capacity, 2 outputs, supporting 50/150 mm² cables.
They retain robust dielectric strength: 20kV impulse withstand, 10kV at 50Hz, and 4kV inter-pole insulation.
3.Shunt Trip Unit: Key Upgrade Advantages
The integrated shunt trip unit is a critical improvement over the original model, enabling remote electrical tripping (e.g., triggered by fire alarm systems or control room buttons) – replacing the limited manual-only operation. This allows fast, automated emergency shutdowns, drastically enhancing grid safety and operational flexibility for unattended outdoor installations.
4.Enhanced Safety & Dual-Mode Reliability
During opening, it maintains electrical connection between the transformer neutral line and busbar; when closed, a specialized spark gap limits BT neutral point voltage rise (supports >10kV applications). Combined with shunt trip protection, it delivers comprehensive fault and emergency safeguards, with a manual override backup ensuring reliable dual-mode operation in harsh outdoor environments.