Eaton Cooper Power Series DAI1250TB3085 IEC Shielded Rear Surge Arrester 30 kV Ur 24 kV Uc

Product Specifications

Product Name: Eaton Cooper Power Series DAI1250TB3085 Shielded Rear Plug-in Arrester

OEM Catalog Code: DAI1250TB3085 (Heavy-Duty Industrial Sub-Surface Submersion Grid Series)

Rated Voltage (Ur Class): 30 kV rms

Continuous Operating Voltage (Uc / MCOV): 24 kV rms

Nominal Current Circuit Rating: Fully optimized for 630 A and heavy-duty 1250 A current-carrying system configurations

Shielding Classification: 100% Screened Deadfront Submersible Interface

Material & Structural Characteristics

• Peroxide-Cured Conductive EPDM Jacket: Encapsulated within a precision-molded, peroxide-cured EPDM rubber semi-conductive outer layer to maintain absolute zero earth potential and provide an unconditional moisture-proof barrier.
• Silver-Loaded Epoxy Bonded MOV Stack: Utilizing ultra-pure zinc metal oxide varistor disks chemically bonded with silver-loaded high-conductivity epoxy to eliminate internal micro-voids and prevent thermal runway under aggressive switching surges.
• Interface C High-Torque Coupling: Precision-molded taper mating interface adhering completely to IEC European engineering drawing standards, facilitating low-resistance contact lock with rear-facing threaded studs.
• Factory Pre-Assembled Grounding Terminal: Features a dedicated pre-cast grounding eye molded directly into the external semi-conductive shield, complete with a high-flexibility tinned copper ground braid link.

Product Functions

1. Piggyback Switching Surge Mitigation: Directly connects to primary front-end separable T-connectors to absorb steep lightning strokes, switching transients, and temporary overvoltages (TOV) without requiring additional cabinet footprint expansions.

2. Deadfront Shielded Potential Isolation: Drains all high-voltage transient stress safely down to the earth neutral network while keeping the entire exterior safe to human touch, eliminating the requirement for phase-to-phase air spacing.

3. Instantaneous Open-Circuit Reset: Operates as a dynamic non-linear voltage valve that exhibits massive impedance at standard operating volts, shunting current only during a surge and resetting to micro-amp leakage levels within microseconds.

Key Features

1. Offshore Wind Array Optimization: Specifically calibrated to withstand the aggressive voltage-tracking phenomenon, moisture ingress, and thermal fluctuations common in marine wind turbine towers and coastal sub-surface cabinets.

2. Field Retrofit Flexibility: Allows field technicians to easily bolt overvoltage safety arrays onto pre-existing operational distribution links via standard hex tools, reducing grid outage schedules by eliminating full cable re-termination tasks.

3. Dielectric Chemical Fluid Stability: Fabricated using premium non-aging polymers tested to ensure zero chemical breakdown or physical degradation when fully immersed in high-temperature transformer mineral oil or alternative bio-based Envirotemp FR3 fluids.

4. 100% Automated Micro-pC Quality Inspection: Every unit undergoes strict production testing including detailed internal X-ray integrity scanning, micro-volt reference verification, and strict partial discharge testing under 2 pC baseline parameters.