391-6302 (3916302)  starter solenoid relay (magnetic switch) designed specifically for the Cummins 6CT series engines. Widely utilized in construction machinery and generator sets, it serves as a critical starter control component for equipment from manufacturers such as Caterpillar.

I. Key Parameters and Specifications

Model: 391-6302 / 3916302

Type: Starter Solenoid Relay (Magnetic Switch)

Compatible Engines: Cummins 6CT, 6CTA8.3-G Series (used in 180KW generators, excavators, etc.)

Voltage: 12V / 24V (24V is the market standard; selection must match specific equipment requirements)

Contact Capacity: High-current starter grade (designed to match starter motors)

Mounting: Integrated with engine starter motor / Externally mounted

Material: Dust-proof and moisture-resistant; suitable for the harsh operating environments of construction machinery

II. Compatible Equipment and Applications

Construction Machinery: Caterpillar excavators (e.g., 320 series), Lovol Heavy Industry FR360-7, etc.

Generator Sets: 180KW Dongkang Generators (6CTAA8.3-G)

Others: Heavy-duty trucks, mining machinery, and other equipment powered by 6CT engines

III. Alternative Models and Procurement

Original Manufacturer (OEM): Cummins 3916302

Generic Alternatives: 3916301, 120-114751-2, 3904619, 3904905

IV. Selection and Replacement Guidelines

Voltage Matching: Absolutely verify whether the equipment operates on a 12V or 24V system.

Mounting Dimensions: Cross-check the starter motor interface and mounting hole positions.

Contact Current Rating: Ensure the relay can safely handle the peak current drawn by the starter motor.

Environmental Protection: Prioritize models with an IP65 or higher dust and water protection rating.