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Datasheet
SRSA 5V/12V/24V 1 Form A PCB Relay with 10 A TV-3 Switching and 200 mW Coil
The Songle SRSA series is a compact through-hole power relay designed for switching mains and DC loads in embedded electronics, home appliances, communication equipment, industrial controls, power supplies, and automation systems. It uses a 1 Form A contact arrangement, equivalent to SPST-NO, providing a normally open switching path that closes when the relay coil is energised. Coil variants including 5 VDC, 12 VDC, and 24 VDC allow the same relay family to be used across different control-voltage systems.
The SRSA relay combines a small PCB footprint with 200 mW coil power, contact resistance of ≤100 mOhm, reinforced-insulation construction, and up to 10⁷ mechanical operations. Depending on the specific approved contact variant, the series supports 5 A/7 A switching at 250 VAC or 30 VDC and TV-3/10 A switching at 125 VAC. With 4,000 VAC dielectric strength between coil and contacts and a 10 kV impulse-withstand rating, the relay is suited to compact control circuits requiring galvanic isolation between low-voltage control electronics and switched loads.
Key Features
- 1 Form A Contact: SPST-NO configuration provides a normally open switching path that closes when the coil is energised.
- 5 V/12 V/24 V Coil Options: Common DC coil versions support a range of embedded and industrial control voltages.
- 10 A TV-3 Rating: Supports TV-3/10 A switching at 125 VAC under the specified approved load category.
- 5 A/7 A Resistive Ratings: Supports applicable 5 A or 7 A contact ratings at 250 VAC or 30 VDC, depending on the exact relay variant.
- 200 mW Coil Power: High-sensitivity magnetic design reduces coil power requirements in control circuits.
- ≤100 mOhm Contact Resistance: Low initial contact resistance helps minimise conduction losses.
- Compact PCB Footprint: Approximate 20.5 x 15 mm footprint supports space-constrained PCB layouts.
- Through-Hole Mounting: PCB terminals provide mechanically secure soldered installation.
- 107 Mechanical Operations: Designed for long mechanical service life under specified operating conditions.
- Up to 105 Electrical Operations: Supports repeated electrical switching within specified load ratings.
- 4,000 VAC Coil-to-Contact Isolation: Provides high dielectric strength between control and switched circuits.
- 10 kV Impulse Withstand: Reinforced-insulation construction supports demanding isolation requirements.
- 1,000 MOhm Insulation Resistance: High insulation resistance specified at 500 VDC.
- Wide Coil Family: SRSA series supports nominal coil voltages from 3–24 VDC.
- Low Pick-Up Voltage: Operates at a maximum of 75% of nominal coil voltage.
- Defined Drop-Out Level: Drop-out voltage is specified at a minimum of 10% of nominal coil voltage.
- Wide Temperature Capability: Series variants support operation from -40°C up to +85°C or +105°C, depending on model.
- Safety Approvals: SRSA series is available with recognised UL, VDE, and CQC approvals.
Applications
- Home appliances
- Power supplies
- Industrial control systems
- Embedded control boards
- Communication equipment
- Smart-home electronics
- Lighting control
- Battery-powered control systems
- Power switching circuits
- Automation equipment
- HVAC control
- Consumer electronics
- Office equipment
- Relay interface boards
- Microcontroller-controlled switching
