Three-Phase Solid State Relay (SSR) 80A: Extreme Power, Silent, & Ultra-Reliable Control

Command High-Current Applications with Unmatched Precision & Durability

In the most demanding industrial environments, precisely managing high-powered three-phase equipment requires a robust, high-performance control solution that goes beyond the capabilities of traditional relays. Mechanical relays and contactors, with their inherent moving parts, suffer from wear and tear, generate disruptive noise, and have limited switching speeds. For critical modern automation, you need an intelligent, silent, and incredibly reliable alternative.

Our Three-Phase Solid State Relay (SSR) is a cutting-edge industrial control appliance engineered for heavy-duty, intelligent, and silent operation. Rated for a formidable 80 Amps and capable of handling 24-480VAC output, this SSR is perfect for the most power-intensive three-phase applications. It offers flexible control with a wide input voltage range of 4-32VDC, ensuring seamless compatibility with a broad array of control systems, from PLCs to manual switches.

Unlike conventional relays, this 80A SSR boasts no moving parts, effectively eliminating wear-and-tear, contact bounce, and disruptive electrical noise. It switches ON and OFF significantly faster, features zero-voltage turn-on and zero-current turn-off for minimal interference, and operates reliably across a wide temperature spectrum from -40°C to 100°C. An integrated LED indicator provides instant visual confirmation of its "ON" or "OFF" status. Experience superior performance, enhanced energy efficiency, and a truly robust, environmentally friendly control solution.

Key Features & Benefits

• Extreme Power 80A Capacity: Capable of switching very substantial loads for robust and stable performance in the most demanding industrial applications.

• Wide Output Voltage Range (24-480VAC): Highly versatile, suitable for a broad spectrum of three-phase AC power systems, ensuring compatibility with diverse setups.

• Flexible Control Input: Accepts both 4-32VDC (ideal for PLC/microcontroller control) signals, ensuring broad compatibility with diverse control circuits.

• Silent Operation: The absence of moving parts eliminates audible clicking and electrical noise, making it perfect for noise-sensitive environments and ensuring a quieter workspace.

• Extended Lifespan: Without mechanical wear, SSRs offer significantly longer operational lives compared to electromechanical relays, drastically reducing maintenance and replacement costs.

• Fast Switching & Zero-Cross Technology: Enables much faster ON/OFF switching and incorporates zero-voltage turn-on and zero-current turn-off, minimising electrical noise, voltage spikes, and extending connected load life.

• LED Status Indicator: A clear LED light provides immediate visual feedback on the relay's "ON" or "OFF" status, aiding quick diagnostics and troubleshooting.

• Wide Operating Temperature: Functions reliably across a broad range from -40°C to 100°C, making it suitable for diverse and challenging industrial conditions.

• Enhanced Safety: "Protect Panel" design and adherence to IEC standards ensure reliable and safe operation, giving you peace of mind in critical applications.

• Green & Efficient: Contributes to a more energy-efficient and environmentally conscious control system by reducing energy loss and waste.

Understanding Solid State Relays (SSRs)

A Solid State Relay (SSR) is an electronic switching device that, fundamentally different from an electromechanical relay, contains no moving parts. It utilises semiconductor components (such as TRIACs, SCRs, or MOSFETs) to switch electrical power.

How it works:

At the core of many SSRs is an optoisolator (or optocoupler). This clever component electrically isolates the input control circuit from the high-voltage output load circuit using light. When a low-voltage control signal is applied to the input, an internal infrared LED illuminates. This light then triggers a photosensitive device on the output side, which in turn activates the high-power semiconductor switching components. This optical isolation ensures excellent electrical separation, enhancing safety and preventing interference between your control system and the powered load.

The output circuit of most standard SSRs behaves like a Normally-Open, Single-Pole, Single-Throw (SPST-NO) switch, providing simple yet effective ON/OFF control. SSRs are highly favoured for their speed, silent operation, and long lifespan in comparison to traditional relays, especially in applications requiring frequent switching or very high reliability.

Important: Heat Dissipation

Solid State Relays, especially very high-current units like this 80A model, generate substantial heat during operation. Proper heat dissipation is absolutely critical for the SSR's performance, stability, and longevity. To ensure optimal operation and prevent thermal damage, this unit MUST be used with a suitable heatsink base or a robust finned heatsink. Please consult the provided heat dissipative power curve (if available) for specific heatsink requirements based on your current load and operating conditions. Failure to use an adequate heatsink will severely limit the SSR's lifespan and performance.

Technical Specifications

• Product Type: Three-Phase Solid State Relay (SSR)

• Rated Current: 80 Amps (A)

• Output Current Range: 0.5A ~ 80A (For optimal heatsink sizing)

• Operation Voltage (Output): 24V ~ 480V AC

• Control Voltage (Input):

  • 4-32V DC
    

• Operating Temperature Range: -40°C to 100°C

• Indicator: LED (showing "ON" or "OFF" status)

• Protection: Protect Panel design

• Standards: IEC Standard Compliant

• Switching Type: Zero-Cross Turn-On / Zero-Current Turn-Off

• Isolation: Optoisolated Input/Output

• Dimensions: 40mm x 110mm x 80mm

• Mounting: Panel Mount (requires heatsink)

Ideal Applications

This 80A Three-Phase Solid State Relay is an excellent choice for precise, reliable, and very high-current control in the most demanding industrial and commercial applications, including:

• Very High-Power Heating Elements: Industrial ovens, large furnaces, high-capacity plastic moulding machines, and very large heating baths.

• Heavy-Duty Motor Control: High-current AC motors, pumps, and fans (ideal for frequent switching or soft start in severe industrial settings).

• Large Industrial Lighting Control: Switching vast banks of high-power industrial lighting.

• High-Capacity Power Supplies: High-capacity regulated power supplies and critical power factor correction systems.

• Heavy Packaging Machinery: Precise control of high-current heating and motion components in large-scale, continuous operations.

• Large HVAC Systems: Controlling substantial industrial compressors, heaters, and fans in critical climate control systems.

• Process Control: General purpose very high-current switching in demanding automated industrial processes where reliability is paramount.

Important Installation & Safety Notice

Installation, wiring, and maintenance of this Solid State Relay must ONLY be performed by a qualified electrician or trained technical personnel in strict accordance with all local electrical codes, safety regulations, and the manufacturer's instructions. Always ensure the main power supply to the circuit is disconnected and locked out before any work is carried out. Improper installation, inadequate heatsinking, or exceeding specified current/voltage ratings can lead to severe overheating, catastrophic equipment damage, electrical shock, or fire. Always use an appropriately sized heatsink for the expected current load and apply a generous safety margin, especially at higher amperages.

Frequently Asked Questions (FAQs)

Q1: Do I need a heatsink for this 80A Solid State Relay?

A1: Yes, it is absolutely critical and non-negotiable. An 80A SSR generates a significant amount of heat during operation. An appropriately sized and robust heatsink (either a heatsink base or a finned heatsink) is vital to efficiently dissipate this heat, ensuring the SSR operates within its safe temperature limits, preventing premature failure, and maximising its lifespan.

Q2: What's the difference between DC control and AC control?

A2: DC control (4-32VDC) means the relay is switched ON/OFF by a low-voltage direct current signal, typically from a PLC, microcontroller, or push-button. AC control (80-250VAC) means the relay is switched by a standard alternating current line voltage, common in many industrial control circuits. You must choose the correct input type for your control system to ensure compatibility.

Q3: Can this 80A SSR be used for single-phase applications?

A3: While designed and optimised for three-phase use, a three-phase SSR can technically be wired for single-phase by using only two of the three output terminals. However, for most single-phase applications, it would be significantly over-specified and likely not the most cost-effective solution. We generally recommend selecting a dedicated single-phase SSR with the appropriate current rating for optimal performance and efficiency.

Q4: What does "zero-voltage turn-on" and "zero-current turn-off" mean?

A4: This advanced feature ensures the SSR turns on only when the AC output voltage crosses zero volts and turns off when the AC current crosses zero amps. This highly precise switching significantly reduces electrical noise, voltage spikes, and electromagnetic interference (EMI) that can be generated during switching, thereby protecting both the SSR and your connected load and ensuring compliance with stricter EMC regulations.

Q5: What types of loads is this 80A SSR most suitable for?

A5: This 80A SSR is ideal for both very high-power resistive loads (like very large industrial heating elements in ovens, furnaces, and kilns) and many inductive loads (like large motors, transformers, and industrial solenoids) due to its zero-crossing feature. When switching inductive loads, it is crucial to ensure that the load's inrush current does not exceed the SSR's specified surge current rating for safe and reliable operation.

Experience superior, silent control for your extreme high-current, three-phase power applications. Order your 80A Three-Phase Solid State Relay today!