Watlow Solid State Relays

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 File #LR700195; VDE 60950 License #40021401, File #1995500 up to 480VAC

• Meets applications requiring agency approval


Solid State Relay Offers

More For Less: Longer Heater Life at Lower Cost

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

Both low and high voltage models are available from 24 up to 530VAC. All ac output models include back to back Silicon Controlled Rectifiers (SCRs) for a more rugged design than the traditional triac based SSR. The internal design allows it to handle high currents and the harsh electrical environments of heavy industry. Watlow also offers a switched VDC model for dc heating applications.

Watlow can provide all 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 belville washers that ensure the relay is mounted with sufficient pressure for good heat transfer. Matched semiconductor fuses and heat sinks are available to complete the power switching package.

relays specifications


120/240VAC
Model Number SSR-240-10A-DC1 SSR-240-25A-DC1 SSR-240-50A-DC1 SSR-240-10A-AC1 SSR-240-25A-AC1 SSR-240-50A-AC1
Current output 10A 25A 50A 10A 25A 50A
Nominal voltage 120/240VAC 120/240VAC 120/240VAC 120/240VAC 120/240VAC 120/240VAC
One cycle surge current 120A 250A 625A 120A 250A 625A
Max. I2t for fusing 60A2 seconds 260A2 seconds 1,620A2 seconds 60A2 seconds 260A2 seconds 1,620A2 seconds
Thermal resistance 1.48° C/W 1.05° C/W 0.63° C/W 1.48° C/W 1.05° C/W 0.31° C/W
Ambient operating temperature -40 to 176°F          (-40 to 80°C) -40 to 176°F          (-40 to 80°C) -40 to 176°F          (-40 to 80°C) -40 to 176°F          (-40 to 80°C) -40 to 176°F          (-40 to 80°C) -40 to 176°F          (-40 to 80°C)
Output (Max.)
Voltage range 48-280VAC 48-280VAC 48-280VAC 48-280VAC 48-280VAC 48-280VAC
Over voltage rating 600V (peak) 600V (peak) 600V (peak) 600V (peak) 600V (peak) 600V (peak)
Off state leakage 10mA 10mA 10mA 10mA 10mA 10mA

120/240VAC Random Fired Models 100VDC
Model Number SSR-240-75A-DC1 SSR-240-75A-AC1 SSR-480-50A-RND SSR-480-75A-RND SSR-240-10A-RND SSR-100-20A-DC1
Current output 75A 75A 50A 75A 10A 20A
Nominal voltage 120/240VAC 120/240VAC 480VAC 480VAC 120/240VAC 100VDC
One cycle surge current 1000A 1000A 625A 1000A 120A 42A (10ms)
Max. I2t for fusing 6,000A2 seconds 6,000A2 seconds 1,620A2 seconds 6,000A2 seconds 60A2 seconds N/A
Thermal resistance 0.31° C/W 0.31° C/W 0.63° C/W 0.31° C/W 1.48° C/W 1.06° C/W
Ambient operating temperature -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C) -40 to 176°F         -40 to 80°C) -4 to 176°F          (-20 to 80°C)
Output (Max.)
Voltage range 48-280VAC 48-280VAC 80-530VAC 80-530VAC 48-280VAC 0-100VDC
Over voltage rating 600V (peak) 600V (peak) 1200V (peak) 1200V (peak) 600V (peak) N/A
Off state leakage 10mA 10mA 10mA 10mA 10mA 0.3mA VDC

480 VAC
Model Number SSR-480-25A-DC1 SSR-480-50A-DC1 SSR-480-75A-DC1 SSR-480-25A-AC1 SSR-480-50A-AC1 SSR-480-75A-AC1
Current output 25A 50A 75A 25A 50A 75A
Nominal voltage 480VAC 480VAC 480VAC 480VAC 480VAC 480VAC
One cycle surge current 250A 625A 1000A 250A 625A 1000A
Max. I2t for fusing 260A2 seconds 1,620A2 seconds 6,000A2 seconds 260A2 seconds 1,620A2 seconds 6,000A2 seconds
Thermal resistance 1.02° C/W 0.63° C/W 0.31° C/W 1.02° C/W 0.63° C/W 0.31° C/W
Ambient operating temperature -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C) -40 to 176°F        (-40 to 80°C)
Output (Max.)
Voltage range 48-530VAC 48-530VAC 48-530VAC 48-530VAC 48-530VAC 48-530VAC
Over voltage rating 1200V (peak) 1200V (peak) 1200V (peak) 1200V (peak) 1200V (peak) 1200V (peak)
Off state leakage 10mA 10mA 10mA 10mA 10mA 10mA


    Dimensions


Click to order -  Relay Accessories


 

$0.00
Watlow Solid State Relays is available to buy in increments of 1

Solid State Relays:

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 File #LR700195; VDE 60950 License #40021401, File #1995500 up to 480VAC

• Meets applications requiring agency approval


Solid State Relay Offers

More For Less: Longer Heater Life at Lower Cost

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

Both low and high voltage models are available from 24 up to 530VAC. All ac output models include back to back Silicon Controlled Rectifiers (SCRs) for a more rugged design than the traditional triac based SSR. The internal design allows it to handle high currents and the harsh electrical environments of heavy industry. Watlow also offers a switched VDC model for dc heating applications.

Watlow can provide all 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 belville washers that ensure the relay is mounted with sufficient pressure for good heat transfer. Matched semiconductor fuses and heat sinks are available to complete the power switching package.

More Information
Manufacturer
Watlow
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