Description
Product Overview
The SRD-05VDC-SL-A is a high-quality, subminiature electromagnetic relay manufactured by Songle Relay (Ningbo Songle Relay Co., Ltd.), one of the most trusted names in the relay industry . This 4-pin, 1 Form A (SPST-NO) relay is designed to switch loads up to 10A at 250V AC or 30V DC, making it an ideal choice for a wide range of applications including home appliances, office equipment, audio systems, and industrial control circuits .
With a 5V DC coil, this relay is perfectly suited for standard 5V microcontroller applications such as Arduino, ESP32, and other 5V logic systems . The relay features a sealed construction that protects the internal contacts from dust, humidity, and environmental contaminants, ensuring long-term reliability even in demanding conditions . It is recognized by major safety agencies including UL, CUL, and TUV, providing confidence for both hobbyist and commercial applications .
The SRD series relay employs a simple magnetic circuit design that enables high-density PCB mounting while maintaining a compact footprint. Its SPST-NO (Single Pole Single Throw, Normally Open) configuration provides straightforward ON/OFF control, making it ideal for applications where the load should be OFF by default and turned ON when the relay is activated .
Key Features
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SPST-NO Contact Configuration (1 Form A): Single Pole Single Throw, Normally Open contact configuration with 4 pins
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10A High Switching Capacity: Contacts rated for 10A at 250V AC or 10A at 30V DC, suitable for controlling lights, fans, pumps, and small motors
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5V DC Coil Voltage: Standard operating voltage of 5V DC with a coil resistance of approximately 70Ω and power consumption of 0.36W (360mW)
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Compact Subminiature Design: Small footprint measuring approximately 19.2mm × 15.6mm × 15.8mm, ideal for high-density PCB mounting
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Sealed Construction: Protects internal contacts from dust, moisture, and environmental contaminants for enhanced reliability
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Safety Agency Approvals: UL, CUL, and TUV recognized for reliable performance in commercial and industrial applications
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Fast Switching Time: Typical operate and release time of ≤10ms, suitable for most control applications
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Wide Operating Temperature: Rated for operation from -40°C to +85°C, suitable for demanding environments
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Coil Voltage (Nominal) | 5 VDC |
| Coil Resistance | 70 Ω ± 10% |
| Coil Power Consumption | 0.36 W (360 mW) |
| Contact Configuration | 1 Form A (SPST-NO) |
| Number of Pins | 4 |
| Contact Rating (Resistive) | 10A @ 250V AC / 10A @ 30V DC |
| Maximum Switching Voltage | 250V AC / 110V DC |
| Maximum Switching Current | 15A |
| Pick-Up Voltage (Pull-In) | ≤ 75% of nominal voltage (≤ 3.75V) |
| Drop-Out Voltage (Release) | ≥ 10% of nominal voltage (≥ 0.5V) |
| Operate/Release Time | ≤ 10 ms |
| Contact Resistance | ≤ 100 mΩ (initial) |
| Insulation Resistance | 100 MΩ min. (at 500 VDC) |
| Dielectric Strength (Coil to Contacts) | 1500 VAC for 1 minute |
| Operating Temperature | -40°C to +85°C |
| Life Expectancy (Mechanical) | 10,000,000 operations |
| Life Expectancy (Electrical) | 100,000 operations at rated load |
| Dimensions (L × W × H) | 19.2mm × 15.6mm × 15.8mm (approx.) |
| Weight | Approx. 9g |
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