Three-Phase Solid State Relay (SSR) 100A: Ultimate Power, Silent, & Ultra-Reliable Control

Master Your Most Demanding High-Current Applications with Unmatched Precision & Durability

For the most power-intensive and mission-critical industrial applications, you need a control solution that offers uncompromising performance. Traditional mechanical relays and contactors, with their inherent moving parts, are prone to wear, generate disruptive noise, and have limitations in switching speed. When precision, longevity, and silence are paramount, a superior alternative is essential.

Our Three-Phase Solid State Relay (SSR) is a cutting-edge industrial control appliance engineered for the highest demands of intelligent, silent, and heavy-duty operation. Rated for a monumental 100 Amps and capable of handling 24-480VAC output, this SSR is perfect for the most power-hungry three-phase applications imaginable. It offers flexible control with a wide input voltage range of 4-32VDC, ensuring seamless compatibility with virtually any control system, from advanced PLCs to robust manual interfaces.

Unlike conventional relays, this 100A SSR has no moving parts, effectively eliminating mechanical wear, 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 electrical interference, and operates reliably across a wide temperature range from -40°C to 100°C. An integrated LED indicator provides instant visual confirmation of its "ON" or "OFF" status. Experience ultimate performance, enhanced energy efficiency, and a truly robust, environmentally friendly control solution built for the future.

Key Features & Benefits

• Extreme High-Power 100A Capacity: Capable of switching truly immense loads for robust and stable performance in the most critical 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 and complex setups.

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

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

• Exceptional Lifespan: Without mechanical wear, SSRs offer significantly longer operational lives compared to electromechanical relays, drastically reducing maintenance, downtime, and replacement costs in high-cycle applications.

• Rapid Switching & Zero-Cross Technology: Enables ultra-fast ON/OFF switching and incorporates zero-voltage turn-on and zero-current turn-off, minimising electrical noise, voltage spikes, and extending the lifespan of your connected load while complying with strict EMC regulations.

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

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

• Enhanced Safety: "Protect Panel" design and adherence to IEC standards ensure reliable and safe operation, providing utmost peace of mind in critical, high-power applications.

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

Understanding Solid State Relays (SSRs)

A Solid State Relay (SSR) is an advanced electronic switching device that, unlike conventional electromechanical relays, operates entirely without moving parts. It utilises semiconductor components (such as TRIACs, SCRs, or MOSFETs) to switch electrical power.

How it works:

At the heart of many SSRs lies an optoisolator (or optocoupler). This ingenious component creates a complete electrical separation between the low-voltage input control circuit and the high-voltage output load circuit, utilising light as the transfer medium. When a 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, greatly enhancing safety and preventing interference between your sensitive control system and the powerful electrical load.

The output circuit of most standard SSRs behaves like a Normally-Open, Single-Pole, Single-Throw (SPST-NO) switch, providing simple yet highly effective ON/OFF control. SSRs are immensely favoured for their incredible speed, completely silent operation, and extended lifespan, particularly in applications requiring very frequent switching or where maximum reliability is paramount.

Important: Heat Dissipation

Solid State Relays, especially extremely high-current units like this 100A model, generate substantial heat during operation. Proper and robust 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 large, appropriately sized heatsink base or a high-performance finned heatsink. Please consult the provided heat dissipative power curve (if available) for precise heatsink requirements based on your specific current load and operating conditions. Failure to use an adequate heatsink will severely limit the SSR's lifespan, lead to premature failure, and compromise safety.

Technical Specifications

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

• Rated Current: 100 Amps (A)

• Output Current Range: 0.5A ~ 100A (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 substantial heatsink)

Ideal Applications

This 100A Three-Phase Solid State Relay is the ultimate choice for precise, reliable, and extremely high-current control in the most critical and demanding industrial and commercial applications, including:

• Ultra High-Power Heating Elements: Very large industrial ovens, furnaces, kilns, and high-capacity thermal processing equipment.

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

• Massive Industrial Lighting Control: Switching vast arrays of high-power industrial lighting in large facilities or stadiums.

• Critical Power Supplies: High-capacity regulated power supplies, industrial power distribution, and power factor correction systems.

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

• Large-Scale HVAC Systems: Controlling substantial industrial compressors, heaters, and fans in critical climate control systems for large facilities.

• Advanced Process Control: General purpose extremely high-current switching in sophisticated automated industrial processes where reliability, speed, and silent operation are non-negotiable.

Important Installation & Safety Notice

Installation, wiring, and maintenance of this Solid State Relay must ONLY be performed by a qualified electrician or highly 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, grossly inadequate heatsinking, or exceeding specified current/voltage ratings can lead to severe overheating, catastrophic equipment damage, electrical shock, fire, and pose extreme safety hazards. Always use a highly robust and appropriately sized heatsink for the expected current load and apply a very generous safety margin, especially at such high amperages.

Frequently Asked Questions (FAQs)

Q1: Do I need a heatsink for this 100A Solid State Relay?

A1: Yes, it is absolutely critical and mandatory for safe and reliable operation. A 100A SSR generates a very significant amount of heat during operation. A large, appropriately sized, and robust heatsink (either a heatsink base or a high-performance 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. Without an adequate heatsink, the unit will quickly overheat and fail.

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 proper functionality and compatibility.

Q3: Can this 100A 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. For optimal performance and efficiency in single-phase applications, we generally recommend selecting a dedicated single-phase SSR with the appropriate current rating.

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 high-power switching, thereby protecting both the SSR and your connected load and ensuring compliance with stricter EMC regulations.

Q5: What types of loads is this 100A SSR most suitable for?

A5: This 100A SSR is ideally suited for both extremely high-power resistive loads (like very large industrial heating elements in extensive oven systems, large furnaces, and kilns) and many large inductive loads (such as very high-power industrial motors, large transformers, and heavy-duty solenoids) due to its zero-crossing feature. When switching inductive loads, it is crucial to rigorously ensure that the load's inrush current does not exceed the SSR's specified surge current rating for safe and highly reliable operation.

Experience superior, silent control for your most extreme high-current, three-phase power applications. Order your 100A Three-Phase Solid State Relay today!