Ghisalba GH78 for Reliable High-Current Power Control

The Ghisalba GH78 Main Contactor (Part Number 881.18.000.045) is a premium heavy-duty contactor engineered for high-current switching applications in industrial automation, marine technology, and power distribution systems. Rated for AC-1 operation at 1350A and AC-3 operation at 1200A at 400V, this contactor represents the pinnacle of electromechanical switching technology for three-phase motor control and power management applications.

Ghisalba has built a distinguished reputation manufacturing high-quality contactors and motor control equipment that meets the most demanding international standards. The GH78 series exemplifies this commitment to excellence with robust construction, high electrical endurance, and reliable operation in the harshest industrial environments. This particular unit is offered in new condition, ready for immediate installation. At Aeliya Marine, every new product undergoes inspection before shipment to verify factory specifications, and is backed by our 30-day warranty and free worldwide shipping.

Key Features & Technical Highlights

• AC-1 Rating 1350A: Full load current rating for non-inductive or slightly inductive loads such as resistive heating
• AC-3 Rating 1200A at 400V: Standard rating for squirrel-cage motor switching during normal operation
• 690V Insulation Voltage (Ui): High voltage insulation rating suitable for industrial power systems
• 6kV Impulse Withstand (Uimp): Exceptional transient voltage protection for demanding electrical environments
• IEC 60947-4-1 Certified: Compliant with international standards for contactors and motor starters
• 600V Maximum Rating: Suitable for North American and international industrial voltage systems
• 220-230V 50/60Hz Coil: Standard control voltage for global industrial control circuits
• Dual 196 VDC Coils: Dual coil configuration provides reliable operation with DC control systems
• 500 Lb-in Torque Rating: High mechanical torque capability for positive contact engagement
• 75°C Ambient Rating: Operates reliably in high-temperature industrial environments

Technical Specifications

Applications & Use Cases

Large Motor Starting and Control

The GH78's 1200A AC-3 rating makes it ideal for controlling large three-phase motors up to approximately 600kW at 400V or 900kW at 690V. Applications include large pumps, compressors, fans, and conveyors in industrial facilities.

Power Distribution Systems

The 1350A AC-1 rating enables the GH78 to switch power distribution feeders, capacitor banks, and transformer circuits in switchboards and motor control centers. The high insulation rating ensures safe operation in medium-voltage distribution environments.

Marine and Offshore Installations

Shipboard electrical systems require contactors that can withstand vibration, humidity, and temperature variations while maintaining reliable operation. The GH78's robust construction and 75°C ambient rating make it suitable for marine switchgear applications.

Renewable Energy Switching

Wind turbine power conversion systems and solar inverter installations utilize high-current contactors for grid connection and internal power routing. The GH78's ratings align with the requirements of multi-megawatt renewable energy systems.

Why Choose the Ghisalba GH78

• Italian Engineering Excellence: Ghisalba contactors are manufactured to exacting European standards for quality and reliability
• Exceptional Current Ratings: 1350A AC-1 and 1200A AC-3 ratings handle the largest industrial motors and loads
• International Standards Compliance: IEC 60947-4-1 certification ensures safety and performance in global installations
• High Voltage Capability: 690V insulation and 6kV impulse ratings for demanding electrical environments
• Dual Coil Options: AC and DC coil configurations provide flexibility for different control system designs
• New Condition: Unused unit provides maximum service life and reliability for critical applications

Compatibility & Integration

The GH78 contactor is designed for integration into motor control centers, switchboards, and power distribution panels. Its standardized mounting dimensions and terminal configurations facilitate installation in new construction and retrofit applications. The contactor can be paired with appropriate overload relays, fuses, and circuit breakers to create complete motor starter assemblies.

The 220-230V 50/60Hz coil is compatible with standard control transformer outputs found in industrial control systems worldwide. For DC control applications, the dual 196VDC coils provide reliable operation from battery-backed control supplies.

Maintenance & Support

As a new unit, the GH78 contactor requires minimal maintenance under normal operating conditions. Periodic inspection of contact condition, coil resistance, and mechanical operation is recommended as part of a preventive maintenance program. Aeliya Marine provides our standard 30-day warranty and free worldwide shipping on this product.

Frequently Asked Questions

Q1: What is the maximum motor size this contactor can handle?

At 400V three-phase, the 1200A AC-3 rating supports motors up to approximately 600kW. At 690V, the rating extends to approximately 900kW. Always verify specific application requirements with a qualified engineer.

Q2: Is this contactor suitable for marine applications?

Yes, the robust construction, 75°C ambient rating, and high vibration tolerance make the GH78 suitable for marine switchgear installations when properly mounted and protected.

Q3: What overload protection is required?

The GH78 requires an external overload relay or electronic motor protection device sized for the specific motor being controlled. Contact our team for recommendations on compatible protection devices.

Q4: Does this include auxiliary contacts?

Auxiliary contact blocks can be added to the GH78 as required for interlocking, indication, and control circuit functions. Contact us for available auxiliary contact configurations.

Q5: What warranty is provided?

Aeliya Marine provides a 30-day warranty on this new contactor, covering manufacturing defects and ensuring proper operation.

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