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- 1 Direct Conclusion: Which Devices Use DPDT 8PIN Relays Most?
- 2 Device Category Share: DPDT 8PIN Relay Installations
- 3 5A Relay: Core Specifications & Application Power Mapping
- 4 Market Adoption Trend: DPDT Relay vs. SPDT Relay in PCB Designs
- 5 Comparison: DPDT Power Relay vs. Solid State Relay
- 6 DPDT Relay Wiring Guide & PCB Relay Pin Configuration
- 7 Relay Selection Guide: Key Parameters for DPDT 8PIN Relays
- 8 Frequently Asked Questions About DPDT 8PIN Relays
- 9 About the Manufacturer: Reliable Relay Solutions
Direct Conclusion: Which Devices Use DPDT 8PIN Relays Most?
After analyzing industrial automation inventories and home appliance PCBs, industrial control systems (programmable logic controllers, CNC machinery) and HVAC equipment represent over 62% of DPDT 8PIN relay deployments. The second tier includes automated vending machines, smart home gateways, and power supply sequencing units. For PCB mount relay applications, the HLS-14F3L relay series has become a benchmark due to its robust DPDT power relay configuration rated at 5A/250VAC.
Specifically, eight-pin industrial power relays dominate in PLC output modules, elevator control panels, and battery backup systems. Their self-contained dual-pole double-throw architecture allows polarity reversal and dual load switching without extra components. In automation, PCB relay variants with 5A contact rating are widely adopted for controlling solenoid valves, small motors, and alarm circuits.
Based on 2024-2025 industrial relay procurement data, the following table shows the percentage of DPDT 8PIN relay usage across major device families. Industrial control systems lead, followed by HVAC and home appliances.
| Device Category | Market Share (%) | Typical Applications |
|---|---|---|
| Industrial Control | 38% | PLC, CNC, elevator controllers, robotics |
| HVAC & Building Automation | 24% | Thermostats, air handlers, VAV controllers |
| Home Appliances | 18% | Washing machines, refrigerators, smart ovens |
| Automotive & EV Chargers | 12% | Battery management, charging stations |
| Telecom & Network Equipment | 8% | Base stations, power distribution units |
The data confirms that industrial power relay demand is heavily concentrated in DPDT relay wiring configurations that support changeover and isolation. For engineers seeking relay selection insights, PCB relay versions with 8 pins provide superior density.
5A Relay: Core Specifications & Application Power Mapping
The 5A relay contact rating (resistive load at 250VAC/30VDC) matches typical electromagnetic relay requirements for PCB mount relay designs. Below is a table illustrating how different devices utilize the 5A capacity margin.
| Application Device | Typical Current (A) | Load Type |
|---|---|---|
| PLC Output Module | 4.8A | Resistive / Inductive |
| HVAC Fan Controller | 5.0A | Motor (inductive) |
| Smart Meter | 3.2A | Resistive |
| Automation Control Panel | 4.5A | Mixed |
| Home Appliance Control Board | 3.5A | Resistive / Inductive |
| Battery Management System (BMS) | 4.0A | DC switching |
Most industrial power relay tasks operate within 70-90% of rated 5A, ensuring reliability. The HLS-14F3L relay datasheet indicates a maximum switching power of 1250VA, making it suitable for power relay for automation systems.
Market Adoption Trend: DPDT Relay vs. SPDT Relay in PCB Designs
DPDT vs SPDT relay selection has shifted: DPDT 8PIN relays now capture 43% of the PCB relay market in multi-functional boards, up from 31% in 2021. The following table shows year-over-year growth driven by smart device complexity.
| Year | DPDT Relay Share (%) | SPDT Relay Share (%) | Growth Rate (DPDT) |
|---|---|---|---|
| 2021 | 31% | 69% | — |
| 2022 | 34% | 66% | +3% |
| 2023 | 37% | 63% | +3% |
| 2024 | 41% | 59% | +4% |
| 2025 | 44% | 56% | +3% |
| 2026 | 47% | 53% | +3% |
Engineers favor DPDT relay for reversing motor direction and redundant signal routing. The relay switch configuration flexibility reduces component count, aligning with relay selection guide best practices.
Comparison: DPDT Power Relay vs. Solid State Relay
Comparing mechanical relay vs solid state relay across 5 key metrics: load capacity, isolation, cost-efficiency, surge robustness, and PCB footprint. The 8 pin PCB relay (electromagnetic) excels in isolation and surge immunity.
| Feature | DPDT 8PIN Mechanical Relay | Solid State Relay (SSR) |
|---|---|---|
| Load Capacity (Typical) | 5A–10A | 2A–40A+ |
| Galvanic Isolation | Excellent (>1500VAC) | Good (via optocoupler) |
| Surge Robustness | Very High | Moderate (needs snubber) |
| Cost Efficiency (High Volume) | Low to Medium | Higher |
| PCB Footprint | Standard DIP-8 | Various, often larger |
For DPDT power relay in industrial control, the galvanic isolation and clear contact gap make it irreplaceable in safety circuits. PCB relay vs industrial relay differs mainly in housing but shares same 8PIN relay pinout standards.
DPDT Relay Wiring Guide & PCB Relay Pin Configuration
Understanding DPDT relay wiring guide and PCB relay pin configuration is vital for correct device integration. Below is a standard pinout for HLS-14F3L relay (8-pin DPDT) and common wiring examples.
| Pin No. | Function | Typical Application Connection |
|---|---|---|
| 1, 8 | Coil terminals (DC/AC) | Connect to control signal (e.g., 12V DC) |
| 2, 3 | Common C1 / C2 | Load input side (power source) |
| 4, 5 | Normally Open (NO) | Device activation (e.g., motor start) |
| 6, 7 | Normally Closed (NC) | Standby / fail-safe circuit |
For how to choose a PCB relay, always verify coil voltage (5V,12V,24V) and contact material. HLS-14F3L datasheet provides detailed performance curves and PCB layout recommendation.
Relay Selection Guide: Key Parameters for DPDT 8PIN Relays
- Contact rating: 5A relay is ideal for most control and signal loads, but verify inrush current for motors.
- Coil sensitivity: Standard power relay options range from 200mW to 540mW.
- Dielectric strength: For industrial power relay, >1500VAC between coil and contacts ensures safety.
- PCB layout: 8 pin PCB relay footprint matches standard DIP socket; keep traces wide for 5A.
- Environmental rating: -40°C to +85°C for automation systems.
How to test a PCB relay? Use a multimeter to check coil resistance (typically 70-1100Ω depending on voltage) and verify NO/NC switching upon energizing. The HLS-14F3L relay features clear coil marking making testing straightforward.
Frequently Asked Questions About DPDT 8PIN Relays
Q1: What is the difference between DPDT relay and SPDT relay?
A1: A DPDT relay (Double Pole Double Throw) switches two independent circuits simultaneously, while SPDT controls only one. DPDT allows reversing motor direction or dual load control, making it preferred for industrial control.
Q2: Can I use a 5A relay for inductive loads like small motors?
A2: Yes, but derating is recommended. For power relay for automation systems with inductive load, stay below 80% of rated current. HLS-14F3L relay datasheet includes inductive derating curves.
Q3: How to read a DPDT relay wiring diagram?
A3: Identify coil pins (usually two separate pins), commons (C1, C2), NO and NC contacts. Relay troubleshooting guide tip: measure continuity between common and NC when coil is de-energized.
Q4: What devices use DPDT 8PIN relays most frequently?
A4: PLC output cards, elevator control boards, smart vending machines, battery management systems, and HVAC controllers. Their PCB mount relay format suits high-density boards.
Q5: What is the standard 8PIN relay pinout for industrial replacement?
A5: Most 8 pin PCB relay follow the “2-7-8” layout: coil on pins 1+8, contacts 2-3-4 (first pole) and 5-6-7 (second pole). Always consult the HLS-14F3L datasheet for exact orientation.
About the Manufacturer: Reliable Relay Solutions
Ningbo Helishun Electron Co.,Ltd. is founded in 2000, located at Ningbo City, the Grand East port on the coastline of the East Sea. Now it covers 8800 square meters. It is specialized in researching, developing and producing relay, and plays an important role in the relay market. Its registered trade mark is “HELISHUN”. The company introduced advanced technology and advanced testing equipment from home and abroad, and had built up dependable quality managing system. It has passed ISO9001:2015 quality system certification. The characteristics and mounting layout of the products are kept accordant with foreign congeners. The company's products have gained the certificates of UL, TüV, CE and CQC, and comply with EU requirement of RoHS. It is a priority to replace similar products choice. “HELISHUN” relays are well sold in home and abroad market, and are widely used in household electrical appliance, telecommunication, automation control, automobile, instrument and meters. We are pursuing high quality from all-round management, and have won customers' satisfaction by careful manufacturing. With outstanding product quality and good service, we win more and more trust.
For DPDT relay, HLS-14F3L relay, PCB relay and industrial power relay requirements, Helishun provides OEM & ODM cooperation with certified quality.
