Industrial Solid-State Relays

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FAQ about Littelfuse Industrial Solid-State Relays.
Littelfuse solid state relays available at DigiKey: Solid State Relays (SSR) | Electronic Components Distributor DigiKey

Q - Who needs Solid State Relays?
A - Solid-state is the best option for industrial professionals who needs very Frequent on/off switching and/or Extra Reliability under tough conditions: Frequent Lights ON/OFF, Precise Heating 80% of customers, Frequent Motor Start/Stop 10% of customs.

Q - Where do we see Solid State Relays?
A - Used inside OEM Machines & Industrial Control Panels.

• Motor Control: For controlling AC or DC motors in conveyor systems or robotics.*

• Heater Control: Precise temperature regulation in industrial ovens or plastic molding machines.

• Lighting Control: Switching large lighting loads in factories or warehouses.

Q - Where else do we see Solid State Relays being used?
A -

• 30% of customers in FOOD & BEVERAGE; for Ovens, Dispensers, and 30% in areas

• Inside buildings for Lighting and HVAC control.*

• 25% in INDUSTRIAL PROCESS & AUTOMATION for Plastics & Packaging.

• OTHERE SPECIFIC INDUSTRIES like Transportation & Energy building up to 15%

Target Markets are for both the OEM business and distribution business

Q - What are the new Littelfuse SRP1 series relays and output details?
A -

• SRP1 family covers a wide array of industrial switching needs:

• DC outputs** (CC series) Uses MOSFETs; optimized for DC loads such as heaters, solenoids, fans, battery systems, and medical/test equipment.

• AC heating and general AC loads (CE/ME), Zero-cross switching minimizes electrical noise*.

  • SRP1-CE: Cost-efficient for AC heating.*
  • SRP1-ME: Compact for space-constrained installations.

• High-endurance, heavy-duty AC loads (CB), Built for high-frequency switching; offers 2-3 times more lifespan.

• Protected, robust AC switching with overvoltage safety** (CR)

There are a few series types of these relays linked here:
SRP1 Series Solid-State Relays - Littelfuse | DigiKey

Q - What are the main Factors to assess when facing a potential customer
A -

1. The need for knowing; Very frequent switching, completely silent switching & Extra Reliable switching needed (This will help determine Whether a solid-state relay is necessary)
2. Load Type to switch (heating elements and lights require different types of SSR then a motor.
3. Load Operating Voltage (to understand if requiring DC or AC relay)
4. Load Operating Current (SSR rating ca vary from 10A to 100A or higher)
5. Overvoltage & Touch-Safe Protection included! (The customer can choose to ad protections itself or because if they are not needed)
6. SSR Control Signal Voltage (Similar to* #3 *above)
7. Mounting Style - (think of being either Panel Mount, DIN Rail or PCB mounting)
8. Consider Using a Heatsink - after you fully review the datasheet and or your situation for using each SSR for your application.

• Also, for your application see pictures on DigiKey site for choosing the proper SSR parts.
  • See if the customer has a project specification document to go by.
    • Consider requirements such as UL, CE, VDE or other.
    • Make sure your application can be validated when using Solid-State-Relays purchased
  • Ask Customer how many unites will be needed for your particular application.
    • What target price and margin can be dealt with the Distributor you choose to use.
  • Make sure to know the Ship-to location and lead times with respect to terms.

Original Littelfuse Inc. FAQs
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