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Solid State Relays with AC or DC Control Inputs
Volume discounts available
Volume Discount Schedule
| Quantity | Price each |
|---|---|
| 1-9 | $33.79 |
| 10-24 | $32.10 |
| 25-49 | $31.42 |
| 50-99 | $30.07 |
| 100-199 | $29.40 |
| 200+ | $28.72 |
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- 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
SSRL240DC10 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
RBC Oxford from
Compact and Functional
Easy to use and inexpensive. Good documentation as always.
Date published: 2016-03-05
Rated 1 out of
5
by
Gray from
Defective
I spoke with one of your engineers and was advised to purchase this model of the solid state relay. When I received it I found it would not do anything. I took one off another heat treat furnace and it worked. I contacted Allen Courtney. Because I failed to write down the name of the engineer he refused to replace it or give a refund.
Lost a customer.
Date published: 2017-06-09
Rated 5 out of
5
by
Mad Scientist from
Good Relays
Our company use a lot of Omega products including these inexpensive relays. We have not encountered any problems with these. As with all electronic components, heat is number one killer. Safeguarding them will increase service life.
Date published: 2018-07-17
Rated 4 out of
5
by
Larry from
Work very well
We have used these SSR in our Chemical Engineering labs for many years. Built many projects based on these and have never had a failure. The indicator LED is very handy in debugging computer programs to make sure you are indeed sending correct information from the computer.
Date published: 2017-01-11
Rated 4 out of
5
by
James from
They work
All ten of the ones I've bought have worked perfectly without any problems.
Date published: 2016-07-27
Rated 4 out of
5
by
Austin2021 from
Good Solid State Relays
Good and well made product that works and has minimal issues.
Date published: 2021-03-05
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
RoHS 2015/863 - View Certificate
UL cULus Recognized
CSA
I want to use this relay to power a 120v ac electric horn, with a 12v battery input. I’m running the 120v ac through an inverter, so will the 12v trigger work on this relay to power horn on and off?
Hi Ed B,
Thank you for the inquiry. Yes. 12 VDC will trigger the SSRL240DC10. The output side of the relay can carry AC voltage only.
Best regards
OMEGA
Date published: 2022-03-10
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
Does the SSRL240DC25 compatible with the PM PLUS Controller? Can I use it to control a 120V, 1000W flexible heater?
Hi seraph333
Thank you for the inquiry. The SSRL240DC25 accepts an input signal of 3 to 32 VDC with max current of 14 mA. I do not have information on the PM PLUS controller unfortunately.
Best regards
OMEGA
Date published: 2022-03-03
Please advise what will be a Clear Plastic Safety Cover? we bought this part SSRL240DC25 came without Finger Guards?
Thank you for your question. I have checked with our Tech Support department and unfortunately, we no longer offer a Clear Plastic Safety Cover. Please contact us if you need any further assistance.
Date published: 2021-04-27
I would like to use this relay to power my AC 10Amp/115V swimming pool pump. I will use a spinkler timer 24V connection to this relay, to switch the swimming pool pump on. Can I provide 24v from the timer to the relay to support the load?
If a DC input SSR is selected it will activate with a 24 VDC signal to turn on the output. It is recommended to use an Amperage rating 3X steady state of a pump because the initial start up Current surge is significantly higher.
Date published: 2021-04-30
For the SSRL240DC25, what is the transfer function of input VDC in to output VAC out? Input 3-32VDC, Output 24-280VAC
The input and output are optically isolated so there isn't really a transfer function. The turn on time is 0.5 of the power cycle maximum at the zero cross over firing point.
Date published: 2020-04-17
Does the PCM-4 Pulse Control Module work on this SSR?
Thank you for your inquiry. Yes, the PCM-4 is compatible.
Date published: 2020-02-12
