Description
Product Overview
The SRD-03VDC-SL-A is a high-quality, subminiature electromagnetic relay manufactured by Songle (Songle Relay) , 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 3V DC coil, this relay is perfect for low-voltage control applications where a 3V logic signal is available. 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 SPDT (Single Pole Double Throw) configuration provides both Normally Open (NO) and Normally Closed (NC) contact options, allowing flexible wiring for your specific application needs .
Key Features
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Compact Subminiature Design: Small footprint ideal for high-density PCB mounting applications
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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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3V DC Coil Voltage: Standard operating voltage of 3V DC with a coil resistance of approximately 25Ω
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SPST-NO Contact Configuration (1 Form A): Single Pole Single Throw, Normally Open configuration with 4 pins
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Sealed Construction: Protects internal contacts from dust, moisture, and environmental contaminants
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Safety Agency Approvals: UL, CUL, and TUV recognized for reliable performance
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Wide Operating Temperature: Rated for operation from -25°C to +70°C
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Low Coil Power Consumption: Approximately 0.36W (for high-sensitivity version) ensuring low power draw from your control circuit
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Coil Voltage (Nominal) | 3 VDC |
| Coil Resistance | 25 Ω ± 10% |
| Coil Power Consumption | 0.36 W |
| Contact Configuration | 1 Form A (SPST-NO) |
| Contact Rating (Resistive) | 10A @ 250V AC / 10A @ 30V DC |
| Maximum Switching Voltage | 250V AC / 110V DC |
| Maximum Switching Power | 1200 VA / 300 W |
| Pick-Up Voltage (Pull-In) | ≤ 75% of nominal voltage |
| Drop-Out Voltage (Release) | ≥ 10% of nominal voltage |
| Operating Temperature | -25°C to +70°C |
| Dielectric Strength (Coil to Contacts) | 1500 VAC for 1 minute |
| Insulation Resistance | 100 MΩ min. (at 500 VDC) |
| Life Expectancy (Mechanical) | 10,000,000 operations |
| Life Expectancy (Electrical) | 100,000 operations at rated load |
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