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Product Groups
High Reliability Solid State Relays
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
SSRL240 and SSRL660 Series
PLACE ORDER 
  • Current Ratings to 100 Amps
  • Multi-Million Cycle Life
  • Compatible with Temperature Controllers
  • Solid-State, SCR Design
  • Zero Voltage Switching
  • Control ac Lines to 660 Vac
  • AC and DC Control Signal Models
  • LED Input Status Indicator
 Specs
 Manuals (contact with email : [email protected])
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Description

Description

The SSRL series of solid state relays are used to control largeresistance heaters in conjunction with temperature controllers. Solidstate relays are SPST, normally open switching devices withno moving parts, capable of millions of cycles of operation. By applying acontrol signal, an SSR switches ON the ac load current, just as themoving contacts do on a mechanical contactor. Three-phaseloads can be controlled using 2 or 3 SSR’s. Use 3 SSR’s for Y or star3-phase loads using a neutral line. Two SSR’s will control “delta” loadswith no neutral line. Three solid state relays are also used whenthere is no neutral load to provide redundancy and extra assurance ofcontrol.

"Switching" takes place at the zero voltage crossover point of thealternating current cycle. Because of this, no appreciable electricalnoise is generated, making SSR’s ideal for environments where thereare apparatuses susceptible to RFI.

Common Specifications
Operating Temperature: -20 to 80°C (-5 to 175°F)
Storage Temperature:-40 to 80°C (-40 to 175°F)
Isolation: 4000 Vrms, input to output; 2500 Vrms input/output to ground
Capacitance: 8 pF, input to output (max)
Line Frequency Range: 47 to 63 Hz
Turn-On Time: 20 ms, ac; 05 cycle, dc
Turn-Off Time: 30 ms, ac; 05 cycle, dc

These SSR’s are of the twin SCR type, inherently morereliable and capable of higher overloads before failure thantriacs. Heat is developed in a solid state relay due to thenominal voltage drop across the switching device. Todissipate the heat, an SSR must be mounted on a finnedheat sink or aluminum plate. An SSR should be locatedwhere the ambient temperature is relatively low, since thecurrent switching rating is lowered as the temperatureincreases. Another SSR characteristic is a small leakagecurrent across the output when the relay is open. Becauseof this, a voltage will always exist on the load sideof the device.

In comparing SSR’s with mechanical contactors, the SSRhas a cycle life many times that of a comparably pricedcontactor. However, SSR’s are more prone to failure due tooverload and improper initial wiring. Solid state relays canfail, contact closed, on overload circuits. It is essential that aproperly rated, fast blowing I2T fuse be installed to protectthe load circuit.

Finned heat sinks are anodized fabrications that comecomplete with tapped mounting holes and screws. Seethermal rating curves and ordering instructions for properselection.

All SSRL series relays come with a thermally conductivepad mounted on the baseplate. This will significantlyimprove the thermal conductivity between the heat sink andSSR baseplate. It is also suggested that 10-inch-pounds oftorque be used on the SSR mounting screws.





Output Specifications for Vac and Vdc Input Models
Specifications10 Amp25 Amp50 Amp75 Amp100 Amp
Max On State Current10 A25 A50 A75 A100 A
Max On State Current100 mA
Max 1-Cycle Surge150 A300 A750 A1000 A1200 A
Max 1 sec Surge30 A75 A150 A225 A300 A
12T (60 Hz), A2sec416937245850006000


SSR240 Series Electrical Specifications
 Input-Control SignalOutput
Model No.TypeControl
Signal
Voltage
Control
Signal
Turn-On
Control
Signal
Turn-Off
Max
Input
Current
Peak
Voltage*
(60 Sec. Max.)
SSRL240AC10
SSRL240AC25
SSRL240AC50
SSRL240AC75
SSRL240AC100
ac
Control
Signal
90 to 280 Vac90 Vac10 Vac10 mA800 V
SSRL240DC10
SSRL240DC25
SSRL240DC50
SSRL240DC75
SSRL240DC100
dc
Control
Signal
3 to 32 Vdc3 Vdc1 Vdc14 mA800 V
SSRL660AC50
SSRL660AC75
SSRL660AC100
ac
Control
Signal
90 to 280 Vac90 Vac10 Vac10 mA1200 V
SSRL660DC50
SSRL660DC75
SSRL660DC100
dc
Control
Signal
4 to 32 Vdc4 Vdc1 Vdc14 mA1200 V
*Transients above table value should be suppressed.

SSR240 Series Output-Vac Load Specifications
Model No.Nominal
ac Line
Voltage
Nominal
Load
Current
Max.
Contact
Voltage Drop
Max. Off-State Leakage
(25°C max. ambient)
120 Vac240 Vac440 Vac
SSRL240AC10
SSRL240AC25
SSRL240AC50
SSRL240AC75
SSRL240AC100
24 to 280 Vac10 A
25 A
50 A
75 A
100 A
1.6 V0.1 mA0.1 mAN/A
SSRL240DC10
SSRL240DC25
SSRL240DC50
SSRL240DC75
SSRL240DC100
24 to 280 Vac10 A
25 A
50 A
75 A
100 A
1.6 V0.1 mA0.1 mAN/A
SSRL660AC50
SSRL660AC75
SSRL660AC100
48 to 660 Vac50 A
75 A
100A
1.6 V0.25 mA0.25 mA0.25 mA
SSRL660DC50
SSRL660DC75
SSRL660DC100
48 to 660 Vac50 A
75 A
100 A
1.6 V0.25 mA0.25 mA0.25 mA
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