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Solid State Relays with AC or DC Control Inputs
Volume discounts available
Volume Discount Schedule
| Quantity | Price each |
|---|---|
| 1-9 | $111.03 |
| 10-24 | $105.48 |
| 25-49 | $103.26 |
| 50-99 | $98.82 |
| 100-199 | $96.60 |
| 200+ | $94.38 |
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- Current Ratings to 100 Amps
- Multi-Million Cycle Life
- Compatible with Temperature Controllers
- Solid-State, SCR Design
SSRL240AC75 Model Options
View all modelsEdit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.
*Highlighted options are not compatible. Please select a different combination.
AC Line Voltage
Control Signal Type
Control Voltage
Nominal Load Current
Phase
Features
The Omega's SSRL series of solid state relays are used to control large resistance heaters in conjunction with temperature controllers. Solid state relays are SPST, normally open switching devices with no moving parts, capable of millions of cycles of operation. By applying a control signal, an SSR switches ON the ac load current, just as the moving contacts do on a mechanical contactor. Three-phase loads can be controlled using 2 or 3 SSR’s. Use 3 SSR’s for Y or star 3-phase loads using a neutral line. Two SSR’s will control “delta” loads with no neutral line. Three solid state relays are also used when there is no neutral load to provide redundancy and extra assurance of control.
'Switching' takes place at the zero voltage crossover point of the alternating current cycle. Because of this, no appreciable electrical noise is generated, making SSR’s ideal for environments where there are 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 more reliable and capable of higher overloads before failure than triacs. Heat is developed in a solid state relay due to the nominal voltage drop across the switching device. To dissipate the heat, an SSR must be mounted on a finned heat sink or aluminum plate. An SSR should be located where the ambient temperature is relatively low, since the current switching rating is lowered as the temperature increases. Another SSR characteristic is a small leakage current across the output when the relay is open. Because of this, a voltage will always exist on the load side of the device.
In comparing SSR’s with mechanical contactors, the SSR has a cycle life many times that of a comparably priced contactor. However, SSR’s are more prone to failure due to overload and improper initial wiring. Solid state relays can fail, contact closed, on overload circuits. It is essential that a properly rated, fast blowing I2T fuse be installed to protect the load circuit.
Finned heat sinks are anodized fabrications that come complete with tapped mounting holes and screws. See thermal rating curves and ordering instructions for proper selection.
All SSRL series relays come with a thermally conductive pad mounted on the baseplate. This will significantly improve the thermal conductivity between the heat sink and SSR baseplate. It is also suggested that 10-inch-pounds of torque be used on the SSR mounting screws.
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Output Specifications for Vac and Vdc Input Models
SSR240 Series Electrical Specifications
*Transients above table value should be suppressed.
SSR240 Series Output-Vac Load Specifications
'Switching' takes place at the zero voltage crossover point of the alternating current cycle. Because of this, no appreciable electrical noise is generated, making SSR’s ideal for environments where there are 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 more reliable and capable of higher overloads before failure than triacs. Heat is developed in a solid state relay due to the nominal voltage drop across the switching device. To dissipate the heat, an SSR must be mounted on a finned heat sink or aluminum plate. An SSR should be located where the ambient temperature is relatively low, since the current switching rating is lowered as the temperature increases. Another SSR characteristic is a small leakage current across the output when the relay is open. Because of this, a voltage will always exist on the load side of the device.
In comparing SSR’s with mechanical contactors, the SSR has a cycle life many times that of a comparably priced contactor. However, SSR’s are more prone to failure due to overload and improper initial wiring. Solid state relays can fail, contact closed, on overload circuits. It is essential that a properly rated, fast blowing I2T fuse be installed to protect the load circuit.
Finned heat sinks are anodized fabrications that come complete with tapped mounting holes and screws. See thermal rating curves and ordering instructions for proper selection.
All SSRL series relays come with a thermally conductive pad mounted on the baseplate. This will significantly improve the thermal conductivity between the heat sink and SSR baseplate. It is also suggested that 10-inch-pounds of torque be used on the SSR mounting screws.
Output Specifications for Vac and Vdc Input Models
| Specifications | 10 Amp | 25 Amp | 50 Amp | 75 Amp | 100 Amp |
| Max On State Current | 10 A | 25 A | 50 A | 75 A | 100 A |
| Max On State Current | 100 mA | ||||
| Max 1-Cycle Surge | 150 A | 300 A | 750 A | 1000 A | 1200 A |
| Max 1 sec Surge | 30 A | 75 A | 150 A | 225 A | 300 A |
| 12T (60 Hz), A2sec | 416 | 937 | 2458 | 5000 | 6000 |
SSR240 Series Electrical Specifications
| Input-Control Signal | Output | |||||
| Model No. | Type | Control 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 Vac | 90 Vac | 10 Vac | 10 mA | 800 V |
| SSRL240DC10 SSRL240DC25 SSRL240DC50 SSRL240DC75 SSRL240DC100 | dc Control Signal | 3 to 32 Vdc | 3 Vdc | 1 Vdc | 14 mA | 800 V |
| SSRL660AC50 SSRL660AC75 SSRL660AC100 | ac Control Signal | 90 to 280 Vac | 90 Vac | 10 Vac | 10 mA | 1200 V |
| SSRL660DC50 SSRL660DC75 SSRL660DC100 | dc Control Signal | 4 to 32 Vdc | 4 Vdc | 1 Vdc | 14 mA | 1200 V |
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 Vac | 240 Vac | 440 Vac | ||||
| SSRL240AC10 SSRL240AC25 SSRL240AC50 SSRL240AC75 SSRL240AC100 | 24 to 280 Vac | 10 A 25 A 50 A 75 A 100 A | 1.6 V | 0.1 mA | 0.1 mA | N/A |
| SSRL240DC10 SSRL240DC25 SSRL240DC50 SSRL240DC75 SSRL240DC100 | 24 to 280 Vac | 10 A 25 A 50 A 75 A 100 A | 1.6 V | 0.1 mA | 0.1 mA | N/A |
| SSRL660AC50 SSRL660AC75 SSRL660AC100 | 48 to 660 Vac | 50 A 75 A 100A | 1.6 V | 0.25 mA | 0.25 mA | 0.25 mA |
| SSRL660DC50 SSRL660DC75 SSRL660DC100 | 48 to 660 Vac | 50 A 75 A 100 A | 1.6 V | 0.25 mA | 0.25 mA | 0.25 mA |
Rated 5 out of
5
by
Ronfire from
Would deal with again for further parts
Prompt shipping , product works well. Fit to FHS 6 was good.
Date published: 2020-07-17
Rated 5 out of
5
by
SewerQueen from
Omega Solid Start Relay
Over the last 20+ years I have only had to replace two of my four relays! I am happy with these & will continue to buy them again when necessary.
Date published: 2018-02-10
Rated 5 out of
5
by
seakim from
Great Product
I continuously bought this product and I am satisfied with its performance.
Date published: 2016-04-19
UL cULus Recognized
CSA
I noticed that the FB-1 fuse holder is discontinued. Do you offer any other fuse holders that work with this fuse?
The FB-2 can be used as well for the KAX-10 fuses.
Date published: 2024-02-14
Hi, Can I use three single solid state relays to power a 3 phase heater coil? Thank you! Paul
You can use three separate solid state relays to power a 3 phase heater. You would wire in parallel the control signal to each relay.
Date published: 2020-02-13
Is a CN743 PID compatible with a SSRL240AC25 SSR? Thank you.
Thank you for your inquiry. Yes, the CN743 PID is compatible with SSRL240AC25 SSR.
Date published: 2024-02-07
Can I connect a CN4116-DC1-DC2 PID controller to a SSRL240DC10 solid state relay to control a 100 W 120 V MB1A1A1A1 band heater? Wire connections between the SSR and PID consist of HW3051-5-100 20 AWG wire. Thank you.
The CN4116-DC1-DC2 PID controller has DC Pulse outputs that are compatible with the dc input SSRL240DC10 solid state relay which can control the MB1A1A1A1, 100 W 120 V heater. All items including the HW3051-5-100 wire are compatible and are properly rated. Please follow the wiring instructions included in the related operator's manuals. You will also require a thermocouple or RTD temperature sensor to complete the system.
Date published: 2022-04-26
Can I use this relay to power a 1/2 hp submersible pump? Thanks
Perhaps. The key is to know how many 'amps' your pump will draw. Check the specifications for your pump and see what that value is. That value should always be lower than the SSR amperage specified value that you choose, but not so close as to cause a surge upon start-up. We recommend a 25% 'window'. e.g. if you choose an SSR that is 10 Amps and your load draws 9 amps, a 10 amp SSR will do, but we suggest that you move up to the next amperage in size due to any 'start-up' surges that may occur.
Date published: 2020-03-09
What are the dimensions?
Hi, thanks for connecting with Omega. Our Tech Support has sent you the manual with the dimensions. Please contact us anytime for any further assistance.
Date published: 2019-05-22
SSRL240AC10 will use this in series with a AC motor the output will switch a low voltage ( less than 3 vdc ) line to ground will this work?
Hi Grandbend,
On this model the input and the output are AC voltage only. So this is not compatible with the application. Please email a request for technical support to TEMP@OMEGA.COM.
Best regards
OMEGA
Date published: 2021-12-20
