Huike HK19F 8-Pin DPDT 24V DC Relay — 1A 125V AC

The Huike HK19F-DC series is a compact, PCB-mount relay family known for reliable switching in electronics, automation, and embedded systems. This page focuses on the 24V DC coil, DPDT, 8-pin variant rated up to 1A at 125V AC, ideal for Arduino, Raspberry Pi, and microcontroller applications requiring galvanic isolation and dependable mechanical switching.

✨ Key Highlights

• DPDT (Double Pole Double Throw) contacts for flexible signal routing and control.
• 24V DC coil — compatible with low-voltage control via a transistor or MOSFET driver.
• Rated 1A at 125V AC (model-specific) — ideal for light loads, signal circuits, and low-power devices.
• Compact 8-pin PCB-mount design for dense layouts and modular boards.

🧰 General Features (Series Overview)

• Brand: Huike
• Series: HK19F-DC
• Nominal Contact Rating (series range): Typically 1A to 2A depending on model
• Contact Configurations: SPDT and DPDT variants available
• Coil Voltages: 3V, 5V, 12V, and 24V DC options
• Contact Voltage (maximum): Up to 250V AC or 30V DC

📐 Technical Specifications

• Coil Resistance: Depends on coil voltage (e.g., ~20Ω for 3V DC variant, ~400Ω for 12V DC)
• Operate Time: ~10 ms
• Release Time: ~5 ms
• Dielectric Strength: 1000V AC (coil to contacts), 500V AC (between open contacts)
• Mechanical Life: Up to 10 million operations
• Electrical Life: ~100,000 operations at nominal load

🔌 Applications

• Industrial control: I/O expansion, small actuator control, and signal routing
• Home automation: Lighting control, HVAC signal switching, and smart appliances
• Automotive (low-current): Auxiliary function control
• Consumer electronics: Signal selection and switching
• Communication equipment: Low-level signal isolation and switching

✅ Advantages

• High reliability and stable performance for both AC and DC signals
• Compact form factor for tight PCB layouts
• Low coil power consumption suitable for battery-powered systems
• Cost-effective component for hobby and professional projects

⚠️ Limitations

• Mechanical wear over time (typical of electromechanical relays)
• Not suitable for high-power loads — use solid-state relays (SSRs) if required

🧪 Example Variant: HK19F-DC 24V

• Coil Voltage: 24V DC
• Coil Resistance: ~1650Ω
• Contact Configuration: DPDT
• Operate / Release Time: 10ms / 5ms
• Contact Rating: 1A at 125V AC

🧩 Integration Tips for Arduino, Raspberry Pi, and Microcontrollers

• Drive the 24V coil through a transistor or MOSFET — do not connect directly to a GPIO pin.
• Add a flyback diode (e.g., 1N4148 or 1N5819) across the coil for transient protection.
• Provide a stable power source with sufficient current capacity.
• Maintain safe PCB clearance between low-voltage logic and AC signal paths.

Use this Huike HK19F relay in automation, control, and embedded designs requiring dependable DPDT switching and 24V DC coil operation.