Top 10 Solid State Relay Manufacturers in Industrial Automation

Industrial solid-state relays handle power switching without moving parts, making them faster, quieter, and longer-lasting than electromechanical alternatives. The right choice among SSR manufacturers depends on your application, load type, and how your supply chain is set up. Here’s a look at ten brands commonly specified in industrial automation and what actually matters when sourcing each one.

10 Leading SSR Brands at a Glance

1. Sensata Technologies (Crydom)

Crydom is the name most engineers reach for when the application is demanding, and reliability isn’t negotiable. Now part of Sensata Technologies, they cover panel-mount, DIN rail, and PCB-mount configurations across a current range that runs into the hundreds of amps.

What sets them apart in procurement terms is distribution depth. Crydom parts move through established global channels, which means shorter lead times and easier replacement sourcing than most specialist brands.

2. Omron Corporation

Omron’s SSR lineup is built around specific use cases rather than a one-size-fits-all approach. The G3PE handles heater control, the G3PJ fits into tight panel spaces, and the G3NA covers general-purpose switching. That segmentation makes selection more precise, but it also means you need to know which series fits before ordering.

Technical documentation is thorough and widely available, which matters for engineers specifying components across multiple projects or sites.

3. Carlo Gavazzi

The RGC and RGS series come with integrated heatsinks, which removes a design step that panel builders often underestimate. Heatsink selection is one of the most common sources of SSR failures, and Carlo Gavazzi’s approach of combining both into a single unit reduces that risk while cutting assembly time.

Their RM series covers motor reversing applications, where switching precision and thermal management both need to be right.

4. Schneider Electric

Schneider’s Zelio Harmony range is designed for environments with high shock and vibration. Conveyors, HVAC installations, and industrial machinery, where standard SSRs tend to fail early, are where these earn their place. The SSL series runs at 6.2mm wide, which is useful when panel space is genuinely tight.

For facilities already running Schneider PLCs and switchgear, the compatibility argument alone often drives the decision.

5. Siemens AG

The SIRIUS 3RF2 and 3RF3 series from Siemens are built for three-phase motor control and precision heating in high-duty industrial environments. TIA Portal integration makes them the natural fit when the broader automation architecture is already Siemens-based, and that ecosystem lock-in is a real procurement consideration worth acknowledging upfront.

Pricing is at the premium end. For critical applications where downtime is costly, that’s usually justified. For standard applications, it’s worth comparing against Autonics or Fotek first.

6. Phoenix Contact

Phoenix Contact approaches SSRs from the perspective of panel design rather than the relay itself. Their ELR electronic load relays and modular DIN rail SSRs are built for high-density cabinets where space and wiring time are the main constraints.

Push-in terminal technology is a practical feature that speeds up installation and simplifies maintenance when a module needs replacing.

7. Celduc Relais

Celduc isn’t the right answer for every project, but for plastic injection moulding, medical equipment, and glass tempering, they’re hard to beat. Their diagnostic SSRs provide real-time fault detection that standard industrial solid state relays don’t offer, and their proportional control models give fine-grained output adjustment for applications where that level of precision matters.

If your application sits outside those niches, a general-purpose brand will likely serve you better at lower cost.

8. Autonics Corporation

Autonics sits in a useful middle ground. Performance is close to European and Japanese brands on standard resistive heating and lamp load applications, but pricing is considerably lower. The SR1 covers single-phase loads, while the SRH2 and SRH3 handle three-phase loads with integrated heatsinks.

For high-volume projects where advanced diagnostics aren’t needed, Autonics is one of the most practical SSR brands available.

9. Fotek Controls

The SSR-40DA is one of the most widely installed DC-to-AC SSRs in packaging and injection moulding machinery globally. Fotek’s strength is availability and straightforward sourcing. CE and UL certifications cover most international project requirements, and the product range is standardized enough that cross-regional procurement is rarely complicated.

They’re not the choice for demanding or specialist applications, but for general-purpose switching on budget-sensitive projects, availability and price work in their favor.

10. Crouzet Automatismes

Crouzet has been producing mechatronic components since 1921, and its SSR lineup reflects that focus on longevity in harsh conditions. The GNS diagnostic series adds system health monitoring for critical applications. Aerospace, energy infrastructure, and specialized industrial machinery are where Crouzet tends to appear.

Distribution reaches over 100 countries, but lead times can be longer than mass-market brands for specific models.

What Actually Drives Sourcing Decisions

Technical specs get most of the attention in SSR selection, but procurement realities often shape the decision more than datasheets do.

Load type is the one technical factor that can’t be overlooked. Zero-crossing SSRs switch at the start of each AC cycle, reducing electrical noise, which makes them the right fit for resistive loads like heaters. 

Random switching SSRs trigger immediately on the control signal, which suits inductive loads like motors, where zero-crossing creates current spikes. Getting this wrong shortens relay life regardless of brand.

On the supply side, the gap between large and specialist SSR brands is significant:

• Schneider, Siemens, and Omron carry deep distribution networks and are easy to source globally, but specific models can run long on lead time
• Celduc and Crouzet offer capabilities that general-purpose brands don’t, but with a narrower distribution that affects urgent replacement sourcing

Thermal management is the other variable that procurement teams often underestimate. SSRs generate heat under load, and inadequate heatsinking is a leading cause of early failure. It’s worth confirming heatsink requirements at the specification stage rather than after installation.

How SimplyBuy Supports SSR Procurement

Sourcing across multiple solid-state relay manufacturers for a single project gets complicated quickly, especially when regional standards differ, or cross-brand comparison is needed before committing to an order.

SimplyBuy operates as a multi-brand industrial automation supply platform covering the full range of SSR brands reviewed here. For procurement teams working across brands and standards, SimplyBuy provides technical data in one place so you can compare load ratings, switching type, and certifications before ordering. 

Multi-standard sourcing covers both IEC and UL certified products for international projects, and specialist models from brands like Celduc and Crouzet that are harder to reach through standard channels are part of the catalog too.

No MOQ on most items means a single replacement SSR is handled the same way as a bulk order. If you need help comparing options or confirming compatibility, get in touch with the SimplyBuy team.

FAQ

Q: What is the difference between zero-crossing and random switching SSRs? 

Zero-crossing SSRs switch at the start of each AC cycle, reducing electrical noise. They suit resistive loads like heaters. Random switching SSRs trigger immediately on the control signal and are better for inductive loads like motors.

Q: Can I substitute one SSR brand for another? 

Usually yes, but load voltage, control voltage, current rating, switching type, and mounting configuration all need to match. Specs that look identical on paper can differ in ways that affect performance.

Q: Which SSR brands work best for high-volume, cost-sensitive projects? 

Autonics and Fotek are the most practical options where budget matters and advanced features aren’t required. Both carry international certifications and are widely available through global distributors.