Three-Phase Solid State Relays (Integrated Heatsink Type) SRH2/SRH3 Series

Product Overview

The SRH2/SRH3 series of three-phase solid state relays are designed with an integrated heatsink that is removable, making them highly adaptable for various applications. These relays are capable of controlling 2-phase or 3-phase loads and are equipped with two types of mounting holes, allowing for compatibility with different heatsinks. With features such as an alarm output for enhanced safety and availability in 24 VAC low voltage models, the SRH2/SRH3 series is ideal for reliable operation in demanding environments. Certain models offer high dielectric strength up to 4000 VAC, and the integrated heatsink design supports both DIN rail and panel mounting.

Safety Considerations

When using the SRH2/SRH3 series solid state relays, it is crucial to observe safety guidelines to prevent hazards. These include:

• Fail-Safe Installation: For critical applications such as nuclear power control, medical equipment, or vehicles, a fail-safe device must be installed.
• Environmental Cautions: Avoid using the relays in environments with flammable gases, high humidity, or direct sunlight to prevent fire or explosion.
• Electrical Safety: Ensure that the relay is installed on a DIN rail or panel and is not connected to a power source during installation or maintenance. Improper handling could result in fire or electric shock.

Cautions During Use

To ensure the safe and effective use of the SRH2/SRH3 series relays, the following considerations must be observed:

• Voltage and Current Limits: Operate within the specified voltage and current limits, and use a properly insulated power supply.
• Heatsink and Ventilation: Attach a heatsink or ensure that the relay is installed in a well-ventilated area. The heatsink should be properly grounded to prevent electric shock.
• Handling Precautions: Avoid touching the relay body or heatsink during operation, as high temperatures can cause burns.
• Short-Circuit Protection: Use a rapid fuse with an I2t value under half of the SSR I2t rating for short-circuit protection.

Product Components

Each package of the SRH2/SRH3 series solid state relays includes:

• The solid state relay unit.
• An instruction manual.

Dimensions

The SRH2/SRH3 series relays are designed with compact dimensions, allowing for easy installation in various configurations. The specific dimensions vary based on the model and rated load current, ensuring a fit for different types of heatsinks and mounting spaces.

Cautions During Installation

Proper installation of the SRH2/SRH3 relays is essential for reliable operation:

• Heat Dissipation: Maintain adequate space between relays to allow for heat dissipation.
• Mounting Options: The integrated heatsink allows for both DIN rail and panel mounting, with the use of appropriate screws and torque settings.
• Cooling Fan: For models requiring additional cooling, select a cooling fan with a suitable air flow rate to maintain optimal operating temperatures.

Connections

The SRH2/SRH3 series offers flexible connection options:

• 2-Phase and 3-Phase Models: Detailed wiring diagrams are provided to ensure correct installation for both 2-phase and 3-phase configurations.
• Terminal Connections: Ensure the use of round crimp terminals with the specified dimensions for both input and output terminals.

Cautions for Wiring

When wiring the SRH2/SRH3 relays:

• Terminal Sizes: Use appropriately sized crimp terminals to ensure a secure and reliable connection.
• Fixed Torque: Apply the correct torque settings when securing input and output terminals to prevent damage or loose connections.

Ordering Information

The SRH2/SRH3 series relays are available in multiple configurations to suit different applications. Model numbers are structured based on the following attributes:

• Type: Integrated heatsink (denoted by "H").
• Number of Control Phases: Available in 2-phase or 3-phase configurations.
• Input Voltage: Options include 4-30 VDC, 24 VAC, or 90-240 VAC.
• Load Voltage: Choose between 24-240 VAC or 48-480 VAC.
• Load Current: Models are available with varying load current ratings (e.g., 15A, 30A, 50A, 75A).
• Function: Select models offer zero cross turn-on or random turn-on features.

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