Toshiba begins shipment of UL 508 certified photorelays

Applications include building automation systems (HVAC).


Toshiba has obtained US safety standard UL 508 certification for the following nine photorelay products: DIP4 package series TLP3556A, TLP3558A and TLP241A; and DIP6 package series TLP3543A, TLP3545A and TLP3546A; and DIP8 package series TLP3547, TLP3548 and TLP3549.

These certified photorelays, all commercially available, can be used in industrial control equipment that requires UL 508 certification, suiting them for use in a wider range of equipment marketed worldwide. These photorelays are also NRNT certified.


The UL 508 standard includes stringent standards for parts. Solid state relays (SSR) are one such category of parts, and the resin temperature within an SSR is restricted to 105 degree C (upper limit). SSRs can be operated at temperatures up to the upper limit.

By using Toshiba UL certified products, users can manufacture control equipment compliant with the UL standard and maintain the thermal design margin required for SSRs.

Applications include industrial equipment (PLC, I/O interface, various sensor control, etc.); building automation systems (heating, ventilation, and air conditioning (HVAC), thermostat, etc.); and replacement of mechanical relays (AC24 to 400V system, DC24 to 125V system).

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