Cummins Heat-Resistant Magnetic Switch 3916301/5265270 for 6CT, Qsl9, 6b5.9, 6c8.3, 6L8.9 Engines

• Customization: Available
• Certification: ISO9001
• Standard Component: Standard Component
• Model NO.: Cummins Heat-Resistant Magnetic Switch 3916301/526
• Technics: Forging
• Material: Iron
• Type: Magnetic Switch
• Weight: 0.192kg
• Transport Package: Wooden
• Specification: 10cm*6.5cm*6.5cm
• Trademark: zhengwei
• Origin: China/USA
• Production Capacity: 500000

Product Description

Introduction

The Cummins 6CT Diesel Engine Part 3916301/5265270 is a high - precision magnetic switch designed to play a critical role in the electrical control system of Cummins engines, particularly the 6CT model, as well as QSL9, 6B5.9, 6C8.3, and 6L8.9 engines. This magnetic switch serves as a reliable electrical actuator, accurately controlling the flow of electrical current based on magnetic fields. It ensures the proper operation of essential engine functions, such as starting, ignition, and power management, thereby contributing significantly to the engine's overall performance, reliability, and efficiency.

Parameter	Details
Part Numbers	3916301, 5265270 (Replaces 4921653, 4921654)
Housing Material	High - strength, heat - resistant thermoplastic (UL 94 V - 0 rating)
Operating Temperature Range	- 40°C to 125°C
Coil Material	High - purity copper
Contact Material	Silver - alloy
Rated Voltage	12V DC or 24V DC (selectable models)
Rated Current	100A (continuous), 200A (peak for 10 seconds)
Contact Resistance	≤50 milliohms
Insulation Resistance	≥100 megohms
Mechanical Life	≥1,000,000 cycles
Electrical Life	≥100,000 cycles at rated load

Working Principle

The magnetic switch operates on the principle of electromagnetic induction. It consists of a coil, a magnetic core, and a set of contacts. When an electrical current passes through the coil, it generates a magnetic field. This magnetic field attracts the magnetic core, which in turn activates the contacts. Depending on the design, the contacts can either close (connecting two electrical circuits) or open (disconnecting them). In the context of Cummins engines, the magnetic switch is often used to control the engagement of the starter motor during engine start - up. When the ignition key is turned, an electrical signal activates the switch, causing the contacts to close and allowing current to flow to the starter motor, which then cranks the engine. Once the engine starts, the switch disengages, to prevent damage to the starter.

Cummins 6CT Engine

Cummins QSL9 Engine

 Cummins 6B5.9 Engine

For the Cummins 6CT engine, widely used in heavy - duty trucks and construction equipment, the 3916301/5265270 magnetic switch provides reliable starting performance. In construction machinery operating in dusty, vibrating, and high - humidity environments, the switch's robust design and high - quality materials ensure stable electrical operation. Its ability to handle high - current loads during engine start - up (with a peak current rating of 200A) guarantees that the starter motor receives sufficient power, even under challenging conditions. The long mechanical and electrical life of the switch reduces the frequency of replacements, minimizing downtime and maintenance costs for equipment operators.

In the QSL9 engine, which powers large - scale industrial equipment and some heavy - duty trucks, the magnetic switch plays a crucial role in power management. The switch's accurate control of electrical current flow helps optimize the performance of the engine's electrical components, such as the alternator and fuel injection system. The low contact resistance (≤50 milliohms) ensures minimal power loss during operation, contributing to improved fuel efficiency. Additionally, the switch's resistance to high temperatures (up to 125°C) makes it suitable for the high - heat environment generated by the QSL9 engine during continuous heavy - load operation.

For the 6B5.9, 6C8.3, and 6L8.9 engines, which are used in various applications including light - to - medium - duty trucks, marine vessels, and power generation units, the magnetic switch offers consistent and reliable performance. In light - to - medium - duty trucks, the switch's quick response time enables smooth engine starting and ignition, enhancing the driving experience. In marine and power generation applications, the switch's high insulation resistance (≥100 megohms) and protection against moisture and corrosion ensure safe and stable electrical operation, even in harsh and humid environments.

 High - Quality Materials

Precision Manufacturing

Constructed with top - tier materials, the magnetic switch is built to withstand the harsh operating conditions within Cummins engines. The housing is made of high - strength, heat - resistant thermoplastic material with a UL 94 V - 0 flammability rating, capable of withstanding continuous operating temperatures ranging from - 40°C to 125°C. This ensures the switch remains functional in extreme cold or high - heat environments. The internal components, including the coil and contacts, are crafted from high - purity copper and silver - alloy materials. The high - purity copper coil offers excellent electrical conductivity, reducing power loss and minimizing the risk of overheating, while the silver - alloy contacts provide superior electrical contact performance, ensuring reliable switching and a long service life.

Each magnetic switch undergoes a meticulous manufacturing process. The coil is precisely wound with a specific number of turns to achieve the optimal magnetic field strength. The contacts are engineered with high - precision machining techniques to ensure accurate alignment and a tight fit, minimizing contact resistance and preventing arcing. The switch is then assembled with strict quality control measures, including comprehensive electrical and mechanical tests, to guarantee its reliability and performance. All components are tested to meet or exceed industry standards for durability and electrical safety.

Benefits of Using Genuine Cummins Magnetic Switches

Reliability: Genuine Cummins magnetic switches, such as the 3916301/5265270 model, are rigorously tested to meet the manufacturer's stringent quality standards. They are designed to endure the vibrations, electrical stresses, and temperature fluctuations typical of Cummins engines, reducing the risk of unexpected failures and minimizing costly repairs.

Perfect Fit: Engineered specifically for the 6CT, QSL9, 6B5.9, 6C8.3, and 6L8.9 engines, these magnetic switches offer a precise fit. This ensures that all electrical connections are made correctly, avoiding issues like incorrect wiring or loose connections that could lead to engine malfunctions.

Optimal Performance: The high - quality materials and precision design of the switches contribute to the engine's optimal performance. By providing reliable electrical control, they enable the engine's various systems to function accurately, resulting in improved fuel economy, reduced emissions, and enhanced overall efficiency.

Warranty and Support: When purchasing genuine Cummins magnetic switches, customers can enjoy the manufacturer's warranty. This provides assurance that in case of any defects or failures within the warranty period, the switch can be repaired or replaced. Additionally, Cummins offers comprehensive technical support, assisting customers with installation, troubleshooting, and maintenance.

Packaging and Delivery

The magnetic switchs are carefully packaged to prevent any damage during transit. They are typically placed in sturdy cartons with appropriate cushioning materials to protect them from impacts and vibrations. Delivery options can vary, and customers can choose from methods such as express shipping for urgent requirements or more cost - effective sea or land freight for larger orders. The delivery process is coordinated to ensure that the magnetic switchs each the customers in a timely manner, minimizing any downtime for vehicle maintenance or repair.

Warranty

Cummins offers a warranty on these magnetic switchs , which provides customers with peace of mind. The exact terms of the warranty may vary depending on the region and the specific application. Generally, the warranty covers any manufacturing defects and ensures that in case of a problem, customers can get the magnetic switch repaired or replaced as per the warranty conditions. This warranty reflects Cummins' confidence in the quality of its products.

Company Profile

Sichuan Zhengwei Power Technology Co.,Ltd. is a comprehensive and diversified enterprise which established in 2009. Headquartered in No. 388 Huanghe Road, Xindu District, Chengdu, Sichuan Province.The company specializes in diesel generator sets, Cummins engine assembly, Cummins pure parts sales and after-sales service. The company not only has a rich product line, including high-quality diesel generator sets and all kinds of pure accessories, but also provides a full range of after-sales service to ensure the stable operation of customers' equipment. In addition, with strong technical strength and rich experience, the company focuses on the maintenance of all kinds of construction machinery at home and abroad, and can provide customers with efficient and professional mechanical equipment maintenance services, solve all kinds of equipment failures, and ensure the normal production and operation of customers. 

Adhering to the corporate purpose of "Let customers get more value", the company will, provide customers with more and better products and services, and jointly open our better cooperation prospects!

Main Product

Production Process

Packaging & Shipping

Certifications

International Partners

FAQ

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Q: What's the lead time for orders?

A: Standard models ship in 15–30 days; customized units require 60-90days.

Q: Do you provide after-sales service?

A: Yes, We have a very comprehensive after-sales system.

Q: Can I request a customized parts?

A: Absolutely! We offer tailored attachments.

Q: What documents do you provide for export?

A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).

Q: How do I place an order?

A: Contact us via email/phone for a quote, then confirm with a PO.

 

Q: I'm not sure if this part fits my engine.

A: Please contact our customer service. We will help you identify or find the parts that fit your engine.

Q: I need other numbered parts, but they are out of stock in your store

A: You didn't want this part? Please contact us.If you can't find what you're looking for in store, it doesn't mean we're out of stock, The possible reasons are:

l The product was not put on the shelves in time

l The product link was invalid

l The keyword you searched for was incorrect

l Your part number machine model serial number was incorrect.

l Category restrictions, more optional models cannot be uploaded.

Therefore, please be sure to contact our customer service to inquiry whether the goods you need are actually in stock.l am confident that we can provide the products you need

 

Q: How long does it take to ship after payment?

A: After you make the payment,we usually need 3 business days to stock up and we will ship it to you.lf the parts you purchased are relatively rare, we will need longer time to stock them, but we will inform you via email.