Three-Phase Solid State Relays (Detachable Heatsink Type) SR2/SR3 Series

Product Overview

The SR2/SR3 series three-phase solid state relays are designed for robust and flexible control of 2-phase or 3-phase loads. These relays come in a detachable heatsink configuration, allowing them to be paired with various heatsinks to meet different cooling requirements. The series is equipped with two different mounting hole types, ensuring compatibility with a wide range of heatsinks. Additionally, these relays offer an alarm output feature that enhances operational safety by providing alerts in case of overheating. Some models in the series boast a high dielectric strength of up to 4000 VAC, ensuring durability and reliability even in demanding applications. Furthermore, the series includes models that support low voltage operations at 24 VAC, making them versatile for various industrial needs.

Key Features

• Flexible Mounting Options: Two mounting hole types allow for compatibility with different heatsinks.
• Enhanced Safety: Includes an alarm function for overheat prevention, featuring a red alarm indicator, output disconnection, and alarm output.
• High Dielectric Strength: Certain models offer up to 4000 VAC dielectric strength, with others providing 2500 VAC.
• Versatile Input and Load Voltages: Available in various input voltage ranges (4-30 VDC, 24 VAC, 90-240 VAC) and load voltage ranges (24-240 VAC, 48-480 VAC).
• Wide Range of Load Currents: Models support load currents ranging from 15A to 75A, accommodating various power requirements.
• Efficient Heat Dissipation: Designed with a ceramic PCB and integrated heatsink for superior thermal management.
• Optional Operating Modes: Available in both zero cross turn-on and random turn-on configurations.
• Operational Indicators: Equipped with a green input indicator and a red alarm indicator for clear status monitoring.

Detailed Specifications

Input Specifications

• Rated Input Voltage: 4-30 VDC, 24 VAC (50/60 Hz), 90-240 VAC (50/60 Hz)
• Allowable Input Voltage Range: 4-32 VDC, 19-26.4 VAC, 85-264 VAC
• Max Input Current: 25 mA for DC models, 15 mA for AC models
• Operating Voltage: ≥ 4 VDC, ≥ 19 VAC, ≥ 85 VAC
• Releasing Voltage: ≤ 1 VDC, ≤ 4 VAC, ≤ 10 VAC

Output Specifications

• Load Voltage Range: 24-240 VAC (50/60 Hz), 48-480 VAC (50/60 Hz)
• Load Current: 15A, 30A, 50A, 75A (depending on model)
• Min Load Current: 0.15A to 0.5A depending on model
• Max Surge Current: Up to 1000A at 60 Hz for certain models
• Voltage Drop: ≤ 1.6V at maximum load current
• dv/dt Rating: 500 V/μs for static off-state

Alarm Output (Overheat Prevention)

• Input Voltage Range: 4-30 VDC, 24 VAC, 90-240 VAC
• Load Voltage: ≤ 30 VDC
• Load Current: ≤ 50-100 mA depending on model
• Turn-off Time: ≤ 20-40 ms depending on model
• Function: Automatically cuts off load output during overheating to prevent damage, with alarm indicators activating for notification.

General Specifications

• Dielectric Strength: 2,500 VAC for lower-rated models; 4,000 VAC for higher-rated models.
• Insulation Resistance: ≥ 100 MΩ at 500 VDC
• Indicators: Green input indicator, red alarm indicator
• Vibration Resistance: 0.75 mm double amplitude at 10-55 Hz (operating), 0.5 mm for malfunction
• Shock Resistance: 300 m/s² for operation, 100 m/s² for malfunction
• Ambient Conditions: Operating temperature -30 to 80°C, storage up to 100°C; humidity 45-85% RH
• Weight: Detachable heatsink type approximately 275g to 365g; integrated heatsink type varies by model, up to 2354g

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