Production Market
Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. has established a strong presence in both domestic and international markets. Currently, domestic sales account for approximately 70% of total business, while overseas markets contribute around 30%, covering North America, South America, Western Europe，the Middle East, and Southeast Asia, etc. Over the past few years, we have successfully exported over 24 million relays annually and cooperated with well-established global partners.
Our Service
At Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd., we provide a comprehensive service system covering pre-sales consultation, in-sales support, and after-sales service, ensuring a smooth and efficient cooperation experience for our global customers.
Pre-Sales Service
Our professional sales and engineering teams offer prompt and accurate pre-sales support. We assist customers in relay selection, application analysis, and technical consultation based on specific requirements such as voltage, current, temperature range, and installation conditions. Customized relay solutions and feasibility evaluations are also available to help customers optimize product performance and cost efficiency at the early stage of projects.
In-Sales Service
During the order execution stage, Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. ensures transparent communication and efficient coordination. We provide detailed order confirmation, production scheduling, quality control updates, and logistics arrangements. Supported by automated production and testing lines, we maintain stable lead times for standard relay models while flexibly managing customized projects according to agreed specifications.
After-Sales Service
We are committed to long-term cooperation and customer satisfaction. Our after-sales service includes technical support, product usage guidance, and prompt response to quality or application inquiries. In case of any issues, our team will work closely with customers to provide timely solutions, ensuring reliable performance of our automotive relays, power relays, and signal relays and new energy relays throughout their service life.
Value-Added Support
In addition to standard services, we support customers with documentation, certifications, sample support, and continuous product improvement. By working with well-established distributors and OEM partners, we aim to build stable, long-term partnerships based on trust, quality, and professional service.
FAQ
Q: What types of relays do you manufacture?
A: Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. manufactures a wide range of relays, including automotive relays, power relays, signal relays, new energy relays, PCB relays, high-current relays, and customized OEM relays.
Q: What is a relay?
A: A relay is an electrically operated switch that allows a low-power control signal to switch a higher-power circuit safely. Relays are widely used in automation, automotive electronics, and industrial control systems.
Q: How do I choose the right relay?
A: When selecting a relay, consider: Coil voltage (12V, 24V, etc.), contact form (SPST, SPDT, DPDT), rated current and voltage, load type (resistive, inductive, motor), mounting method (PCB, socket, plug-in), and required certifications.
Q: What does SPST / SPDT / DPDT mean?
A: These terms describe the relay contact configuration: SPST: Single Pole Single Throw; SPDT (1 Form C): Single Pole Double Throw; DPDT (2 Form C): Double Pole Double Throw.
Q: What is the difference between NO and NC contacts?
A: NO (Normally Open) contacts close when the relay is energized. NC (Normally Closed) contacts open when the relay is energized.
Q: What certifications do your relays have?
A: All relays from Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. comply with international standards and may carry certifications such as UL, TUV, CE, CQC, and RoHS, depending on the model.
Q: What is the typical lifespan of a relay?
A: Relay life includes: Mechanical life (up to millions of operations) and electrical life (depends on load, current, and switching frequency). Correct relay selection ensures maximum service life.
Q: Can relays be customized for OEM projects?
A: Yes. Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. offers OEM and ODM services, including coil voltage customization, contact material selection, pin layout and housing design, and branding/private labeling.
Q: What applications use power relays?
A: Power relays are commonly used in home appliances, industrial automation, power supplies, motor control systems, EV and energy storage systems.
Q: What is the difference between AC and DC relays?
A: DC relays use DC coils and are common in automotive and electronics. AC relays are designed for AC coils and include shading rings to prevent chatter.
Q: What causes relay failure?
A: Common causes include overcurrent or overload, contact arcing, incorrect coil voltage, excessive switching frequency, and harsh environmental conditions.
Q: Do you provide relay samples?
A: Yes. Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. provides free samples for customers' testing and evaluation. For certain models, reference samples or technical specifications may be required before quotation.
Q: What is your production capacity and lead time?
A: Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. operates fully automated production and testing lines. For standard models, lead times are short, with capacity reaching up to 1,000 pcs within 10 minutes. Customized products scheduled per project.
Q: Do you have sales target requirements for distributors?
A: Yes. Sales target requirements for authorized distributors depend on the market, product category, and cooperation model. Specific targets are agreed during distributor evaluation.
Q: Can we ship goods from another supplier to your factory for combined loading?
A: Yes. Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. can arrange delivery as requested. Please provide confirmation on delivery timing, packaging, and loading responsibilities in advance.
Q: When will your factory close for the Spring Festival holiday?
A: The factory usually closes according to the official Chinese holiday schedule. Dates vary each year. We inform customers in advance to ensure smooth production and shipment planning.
Q: What is the operating temperature range of your relays?
A: Standard models typically support –40°C to +85°C. Selected models can operate at +105°C or +125°C depending on design. Please refer to product datasheet.
Q: Do you have an office in Shanghai or Guangzhou that I can visit?
A: Yes. The company has a representative office in Guangdong. The main manufacturing facility is located in Ningbo.
Q: Will you attend trade fairs to exhibit your products?
A: Yes. The company attends major international and regional trade shows. Please check our website or contact us for upcoming events.
Q: Can you deliver your relays to a warehouse in Guangzhou?
A: Yes. Shipments can be arranged to customer warehouses in Guangzhou or any other Chinese cities. Contact us in advance with delivery details.
Q: What standards and certifications do your relays comply with?
A: Relays are manufactured per ISO 9001, UL, TUV, CQC, CE, and RoHS depending on model. Rigorous production processes ensure consistent quality.
Q: How are your relays packaged?
A: Standard packaging includes inner boxes and outer cartons. Customized packaging (branding, labeling, protective materials) is available upon request.
Q: How many years has your company been manufacturing relays?
A: Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. has been designing and manufacturing relays since 2012.
Q: How many staff members work in your factory?
A: The company employs approximately 50 staff members.
Q: How can I become your agent in my country?
A: Please contact us with your company profile, market experience, and intended sales region. We will evaluate and discuss partnership terms.
Q: How far is your factory from the city center or nearby hotels?
A: The factory is just 30 minutes' drive from the city center and conveniently accessible from local hotels in Ningbo.
Q: How far is your factory from the airport in Ningbo?
A: The factory is just 20 minutes' drive from Ningbo Lishe International Airport.
Q: How far is your factory from Shanghai?
A: It takes about 3 hours by car or 2 hours by high-speed train from Shanghai to Ningbo.
Q: How long will it take to travel from Guangzhou to your factory?
A: It takes about 3 hours by air from Guangzhou to Ningbo.
Q: Where is your factory located?
A: 350 Renmin North Road, Hengxi Town, Yinzhou District, Ningbo, Zhejiang, China.
Q: What is your term of payment?
A: 30% advance payment and 70% balance before shipment. Contact us for specific payment requests.
Q: What is your MOQ?
A: Usually 1000 pieces for standard relays. Customized products may have different MOQ requirements.
Q: Are you a trading company or a manufacturer?
A: Ningbo Keyong Jingsheng Electrical Appliance Co., Ltd. is a relay manufacturer.
Q: How many production lines in your factory?
A: More than ten automated production lines, with continuous investment in additional lines to enhance capacity and efficiency.
