In the application of industrial automation, smart home, and new energy, relay purchasing directly relates to equipment stability and cost. Summarized below are five scientific purchasing strategies through the analysis of market trend evolution and various relay test results to help you choose scientifically and purchase accurately, avoiding more than 90% of common pitfalls, thereby improving system performance and cost optimization.
Tip 1: Accurately define parameter requirements
Rated current/voltage: The load current should be less than 70% of the nominal value of the relay (for example, the rated value of a 30A load is 50A), and the voltage should be suitable for the operating conditions of the equipment within a range of ± 10%.
Contact type: Most applications can use single pole double throw (SPDT), while complex switch circuits can use double pole double throw (DPDT).
Coil drive: 5V/12V/24V and other driving voltages must be compatible with the control circuit, and an error greater than ± 15% can easily lead to suction faults.
Environmental flexibility requirements: Ceramic packaging models should be selected for high temperature environments (>70 ℃), and IP67 or higher protection levels should be specified for humid environments
The best suggestion is to clarify the parameters of the relay with the supplier when selecting. If it is a large-scale procurement, you can request the product parameters and samples from the supplier for testing. Whether it matches your specific product usage will also facilitate future transactions.
Tip 2: Balancing the Performance and Cost of Relays
Silver nickel alloy: the preferred choice for high-frequency switches, with an electrical lifespan of over 100000 cycles (relatively high cost)
Gold plated contacts: suitable for low resistance demand scenarios, such as precision instrument signal transmission.
Ordinary silver contacts: suitable for low-frequency, low-cost projects (daily switching<100 times)
Choosing different materials comes with different costs. As a purchaser, we cannot only focus on the price of the product. If the price is very low, the quality of the product may be problematic. This will damage your device, so we need to choose a balance.
QIANJI relay supplier is a high-quality and affordable supplier, making it your first choice for procurement
Tip 3: Choose brand procurement
| Application Scenario | Recommended Brands | Key Advantages |
|---|
| Industrial Automation | QIANJI, Schneider | Shock-resistant design, IP67 protection, overcurrent protection |
| Automotive Electronics | TE Connectivity, Chinachem | Military-grade shock resistance, -40°C to 125°C wide temperature range |
| Low-Cost Bulk Purchasing | QIANJI,Chint, Delixi | UL certification, price only 50% of imported brands |
Tip 4: Product Quality Verification
- Third party test: The vendor must submit a CNAS accredited load life test report (focusing on changes in contact resistance after 100000 cycles)
- Appearance identification: Smooth and burr free contacts, high quality products will have, and shell injection molding will not have burrs. Poor quality products have rough solder joints of coils and a peculiar smell in the plastic shell
- Small batch testing: Random sampling for 72 hours full load testing, temperature rise should be<40 ℃
- Product certificate: Whether the product has CE, UL and other certification certificates, generally those with good quality
Tip 5: Refined Supply Chain Management
- Delivery date negotiation: It is necessary to communicate with the customer, determine the delivery time of the product, and allocate the specified obligations
- Logistics solution: Suppliers should choose a more cost-effective solution and prioritize sea freight when products are not urgently needed
- Long term cooperation strategy: When a large quantity of products is needed and the procurement amount is between 500000 and 1 million, suppliers can lower prices to achieve long-term cooperation projects
