Relay Selection Guide: 9 Steps to Choose the Right Product

How to choose a relay? Master these 9 key steps to easily select the right product for your needs:

1. Select Product Category

In & Out relay codes start with letters, corresponding to different application scenarios:

• A: Automotive Relays, suitable for various automotive equipment
• C: Air Conditioning/High Power Relays, suitable for solar panels, industrial control
• E: EV Relays, dedicated to electric vehicle industry, high-voltage devices
• G: Power/General Relays, suitable for household appliances, smart home, toys
• N: New Energy Relays, suitable for photovoltaic field
• H: High Current/Industrial Control Relays, suitable for solar panels
• L: Latching Relays, suitable for smart electricity meters
• P: MOS Relays
• S: Slim Industrial Control Relays
• T: Signal Relays, suitable for communication equipment, office equipment

2. Confirm Operating Voltage

Distinguish between Alternating Current (AC)/Direct Current (DC), corresponding voltage ranges:

• DC: 3~110VDC
• AC: 5~230VAC

3. Select Contact Configuration

Choose according to circuit on/off requirements:

• 1A, 1B, 1C, 2A, 2B, 2C

4. Match Coil Power

Different codes correspond to different power levels:

• Nil: Standard regular products
• 25: 250mW
• 36: 360mW
• 40: 400mW

5. Confirm Contact Current

Select according to current carrying requirements:

• 8: 8 Amperes, 12: 12 Amperes, 16: 16 Amperes

6. Select Suitable Terminals

• Terminal pitch or type varies by product model; select the one matching your circuit board specifications.

7. Determine Packaging Type

• Plastic-sealed type: For environments with potential contamination or dust
• Solder-resistant type: For clean environments

8. Choose Contact Material

• Common contact materials for In & Out relays: AgSnO₂ / AgNi / AgCdO; gold-plated contacts are optional for some models to meet higher conductivity requirements.

9. Special Specification Marking

• Special customized specifications or customer-specific codes will be marked at the end of the product model.