GEYA, a premier relay manufacturer, provides compact, highly adaptable relays for industrial and home automation. Beyond our signature ultra-wide voltage and delay ranges, select models feature built-in Wi-Fi for smart remote and time-scheduled power control.
GEYA has extensive experience in producing and supplying relays of stable quality and quantity. Furthermore, we offer more advanced structural designs and superior contacts in our product design. This ensures a longer service life and faster switching response.
1. Control Side Parameters (Coil Voltage/Input Signal)
These are the conditions for driving the relay. You need to confirm whether the output signal of your control system is AC or DC, and the specific rated voltage value (such as common 5VDC, 12VDC, 24VDC, or 220VAC). If the coil voltage is mismatched, the relay will not engage or will burn out.
2. Load Side Parameters (Contact Capacity)
These are the parameters of the circuit that the relay needs to "switch." You must specify the maximum operating voltage and maximum operating current of the controlled load (e.g., 10A/250VAC).
Note: Load type is also important. For "inductive loads" such as motors and transformers, there will be a very large inrush current at startup; sufficient margin needs to be allowed when selecting a model (usually derating).
3. Contact Form
Choose the appropriate contact combination based on your circuit logic:
Normally Open (NO / Form A): Closes when energized, opens when de-energized.
Normally Closed (NC / Form B): Opens when energized, closes when de-energized.
Switching Contact (SPDT / Form C): Contains one normally open and one normally closed contact, used for switching between two lines.
Also consider whether it's a single-group contact, a double-group (DPDT), or multiple-group contacts.
4. Relay Technology
Choose the appropriate technology category based on your application:
Electromagnetic Relay (EMR): The most common, low-cost, suitable for most conventional switch controls.
Solid State Relay (SSR): No mechanical contacts, extremely long lifespan, fast switching speed, completely noiseless, suitable for high-frequency switching scenarios.
Timer Relay: With delay function (such as the wide delay range products that GEYA specializes in, as you mentioned earlier).
Smart Relay: With Wi-Fi module, enabling remote and timed control.
5. Installation Method and Package Size
The installation method depends on your equipment structure:
PCB Mounting: Directly soldered onto the circuit board (typically very small size).
DIN Rail Mounting: Commonly used in industrial control cabinets.
Socket/Plug-in: Used with a base for easy plugging, unplugging, replacement, and maintenance.
Panel/Flange Mounting: Secured to the equipment housing with screws.
6. Operating Environment and Safety Certifications
Environmental Factors: Consider the temperature range and humidity of the operating environment, and whether a hermetically sealed design (dustproof, flux-proof, or waterproof) is required.
Certifications: Ensure the product meets the safety certifications of the target market, such as UL (North America), CE (Europe), RoHS (environmental standards), etc.