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Solid State Relays 

Watlow solid state relays (SSR) offer many of the advantages of solid state power controllers, but at a lower cost. Watlow's extensive knowledge in power controller design led to the development of a special fast cycle input card that enables a solid state relay to operate from a standard 4-20mA instrumentation command signal. Test results show that zero-cross solid state relays in combination with the fast cycle card promote better temperature control and longer heater life than slow cycle relays. Through a time proportional cycle rate of 1⁄10 of a second, heater life will be extended.

Both low and high voltage solid state relays are available from 24 to 660VAC. All ac output models include back-to-back silicon controlled rectifiers (SCRs) for a more rugged design than the traditional triac-based solid state relay. The internal design allows it to tolerate high currents and harsh electrical environments of heavy industry. Watlow also offers a switched VDC model for dc heating applications.

Watlow provides all of the components necessary for trouble-free operation. This includes two standard convenience items: a thermal foil to ensure proper thermal transfer from the relay to the heat sink and belleville washers to ensure that the relay is mounted with sufficient pressure to enable good heat transfer. Matched semiconductor fuses and heat sinks are available to complete the power switching package.

Specifications:

Mounting:  Back panel
Max Output:  75A
Output Firing:  Zero Cross
Phase Configurations:  1
Ambient Operating Range:  25 to 85°C  (77 to 185°F)
Agency Approvals:  UL®, CSA, SCCR
Dimensions:  2.25 in. (57.2 mm) H x 1.75 in. (44.5 mm) W x 0.9 in. (23 mm) D
Warranty (years):  2
Note: The specifications in the table above are best available values in each category. Not all combinations of these values are available in a single model number.

Features & Benefits:

Features Benefits
Fast cycle card
  • Increases heater life
  • Optimizes temperature control
  • Allows for higher watt density heaters
Zero cross firing
  • Results in minimal electrical noise
Back-to-back SCR design
  • Withstands harsh or hostile industrial environments
UL® recognized File #E151484 and #E73741 CSA certified up to 600VAC, File #LR700195 VDE 60950 License #40021401, File #1995500 up to 480VAC, CE
  • Meets applications requiring agency approval

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Related Literature

Specification Sheets (3)

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User Manuals (6)

Training and Education (1)

White Papers (1)

Quality Certificates (1)

CAD Drawings (3)

Catalogs (2)

 

Images:

Solid State Relay
Solid State Relay