The Lower Module Power Assembly (Part Number: 110523R825SP) designed and manufactured by premier Italian power electronics specialist SECOM s.r.l. is a certified genuine OEM replacement sub-assembly specifically configured for the bottom section of the heavy-duty GR.6 Series power rectifier bridge (Model configuration: GR.6-P-P74-78-RT25) rated for high continuous currents up to 4500A DC.

PRODUCT OVERVIEW & SPECIFICATIONS (110523R825SP):
- Part Number: 110523R825SP
- System Compatibility: Dedicated spare part for SECOM GR.6-P-P74-78-RT25 high-power conversion stacks.
- Mechanical Sub-Assembly: Lower Section Module (Bottom Tier Assembly), engineered to fit seamlessly into the lower airflow path and DC/AC busbar interconnects of the GR.6 power enclosure.
- Continuous Current Rating: 4500A nominal DC rating with exceptional short-time overload withstand.
- Press-Pack Semiconductor Assembly: Incorporates high-power industrial hockey-puk / disc-type thyristor or diode devices clamped with precision calibrated spring sets to ensure optimal electrical contact resistance and low thermal impedance.
- Heavy-Duty Plated Copper Busbars: Precision-formed high-conductivity electrolytic copper busbars treated with anti-corrosion tin/nickel plating, delivering balanced current distribution across parallel semiconductor arms.
- Optimized Heat Dissipation Manifold: Aerodynamically engineered extruded aluminum heatsink profiles designed for high-velocity forced-air cooling (or liquid cooling integration depending on cabinet configuration).

KEY ADVANTAGES:
- 100% Drop-In OEM Interchangeability: Precise mechanical mounting dimensions, busbar termination positions, and gate firing lead routing guarantee rapid on-site replacement with zero cabinet retrofitting, minimizing plant downtime.
- Superior Fault Ride-Through (High I²t Withstand): Engineered with high surge current and short-circuit withstand capabilities, providing reliable operational margins against heavy load fluctuations.
- Industrial European Electrical Insulation: High-creepage GPO-3 / FRP insulating barriers prevent surface tracking under high humidity, dust, and aggressive industrial plant atmospheres in compliance with IEC/EN standards.

• Manufacturer: SECOM s.r.l.
• Origin: Italy
• Part Number: 110523R825SP
• Component Type: Spare Part Lower Module Power Assembly
• Target System: SECOM GR.6-P-P74-78-RT25 Power Conversion Bridge
• Rated Output Current: 4500 A (Continuous DC)
• Semiconductor Technology: High-power press-pack disc thyristors / diodes
• Cooling Method: Forced-air convection (or liquid-cooled according to GR.6 cabinet execution)
• Busbar Conductor Material: High-conductivity electrolytic copper with anti-oxidation plating
• Structural Construction: Galvanized steel structural frame with high-grade GPO-3 / FRP insulation
• Rated Insulation Voltage: Up to 3.6 kV / 4.5 kV (application-specific semiconductor class)
• Clamping System: Calibrated mechanical spring clamping system with visual compression indicators
• Operating Ambient Temperature: -10°C to +50°C
• Storage Temperature Range: -40°C to +85°C
• Surge Capability: Optimized for coordination with high-speed semiconductor protection fuses
• Typical Applications: Chemical electrolysis rectifiers, high-capacity industrial plating plants, DC electric arc furnaces, traction power substations, and rolling mill DC motor drive converters.