High voltage high frequency dc solid state relay

• Optical-magnetic coupling isolation between input and output circuits.
• Control signal interfaces with PLC, TTL, PWM signals.
• LED indicator for working status.
• Solid-state, contactless switch output, no sparks or arcing during switching.
• Built-in protection features for under-voltage, over-voltage, and over-temperature.
• Encapsulated in epoxy resin, providing corrosion resistance, shock resistance, and reliable operation.
• The product is mainly used for industrial control of DC high-voltage, high-current, high-power switching electrical equipment.

Since the load voltage of a DC solid-state relay is equal to its off-state voltage, and the load current is at its maximum value at room temperature, a margin should be left when selecting one. For resistive loads: the current should be chosen at 2.5 to 4 times the load current, and the voltage should be chosen at 2 to 3 times the load voltage. For inductive loads: the current should be chosen at 4 to 6 times the load current.

The actual load current is greatly related to the ambient temperature. When the ambient temperature is high or the cooling conditions are poor, the current capacity should be increased. To prevent a load short circuit during use, it is required to add an overload protector in the load circuit.

For inductive loads, the GDZ08GY/GDZ08CGY model must have a flyback diode connected across both ends of the load to prevent damage to the solid-state switch by over-voltage. The GDZ08GD/GDZ08CGD model has an integrated flyback diode, so it can be used directly with inductive loads without adding a separate flyback diode.

The heat sink that comes with this product must have a flat and clean contact surface, and a layer of thermal conductive silicone grease should be applied to its surface. When fixing, screws should be tightened symmetrically with spring washers and flat washers to prevent loosening due to thermal expansion and contraction.

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What Do High Frequency and Low Frequency Mean in DC Solid State Relays, and What Are the Differences?

High frequency and low frequency in DC solid state relays (DC SSR) refer to the frequency at which the relay can switch the circuit, i.e., the number of times the relay can open and close within a unit of time. The differences between high frequency and low frequency are mainly reflected in the following aspects:

Switching Speed:

High Frequency: High-frequency solid state relays can complete switching operations in a very short time, usually at the millisecond or even microsecond level. This makes them suitable for applications requiring rapid response, such as pulse modulation and fast power switching.

Low Frequency: Low-frequency solid state relays have a slower switching speed and are suitable for applications that do not require frequent switching, such as general power control and heater control.

Application Scenarios:

High-Frequency Applications: Suitable for scenarios requiring fast switching, such as communication equipment, automation control systems, and audio equipment.

Low-Frequency Applications: Suitable for scenarios with lower switching frequency, such as lighting control and simple motor start and stop.

Thermal Management:

High Frequency: Due to frequent switching operations, high-frequency solid state relays may generate more heat, requiring better thermal design.

Low Frequency: Generates relatively less heat due to lower switching frequency, thus having lower thermal management requirements.

Electromagnetic Interference (EMI):

High Frequency: High-frequency switching may generate more electromagnetic interference, requiring additional measures to suppress EMI.

Low Frequency: Relatively less electromagnetic interference, making the design simpler.

Lifespan and Reliability:

High Frequency: Frequent switching operations may pose higher demands on the device's lifespan and reliability.

Low Frequency: Due to fewer switching operations, they generally have a longer lifespan and higher reliability.

In summary, the choice between high frequency and low frequency DC solid state relays depends on specific application requirements, including response speed, thermal management, and electromagnetic compatibility.