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SSRL240-660
Solid State Relays with AC or DC Control Inputs
Models In Stock
- Current Ratings to 100 Amps
- Multi-Million Cycle Life
- Compatible with Temperature Controllers
- Solid-State, SCR Design
SSRL240-660
From
$
46.57
Models In Stock
Product Overview
- Current Draw 100 mA
- Features High Reliability
- Frequency 47 to 63 Hz
- Input/Output-to-Ground Isolation 2500 Vrms, 2500 V
- Input-to-Output Capacitance 8 pF
- Isolated Analog Voltage 4000 Vrms
- Number of Phases 1
- Operating Temperature, Max 80 °C
- Operating Temperature, Min -20 °C
- Operating Voltage, Min 1.6 V
- Series ID SSRL240-660
- Storage Temperature, Max 80 °C
- Storage Temperature, Min -40 °C
- Surge Current Rating 1 Cycle, Max: 150 A; 1 s, Max: 30 A
- Thermal Sensitivity 416
Supported Applications
The Omega SSRL240/SSRL660 series are single-pole, normally open solid-state relays (SSRs) designed to control large resistance heaters in conjunction with temperature controllers. These devices utilize a zero voltage switching design that switches at the 0-voltage crossover point of the AC cycle to minimize electrical noise (RFI). The SSRs feature an SCR-based architecture capable of tens of millions of cycles and are used for controlling resistive loads up to 40 kW.
Configurations support single-phase control or three-phase load management:
- Three-Phase Y-Loads (with neutral): Use 3 SSRs.
- Three-Phase Delta Loads (no neutral): Control using 2 SSRs.
- Redundant Three-Phase Systems: Use 3 SSRs when there is no neutral load to provide redundancy and extra assurance of control.
Note: These products are not designed for use in, or should not be used for, patient-connected applications. Installation and servicing require qualified technicians familiar with high voltage and current circuits.
Operating Conditions & Performance
The series operates within an ambient temperature range of -20 to 80°C (-5 to 175°F) and a storage temperature range of -40 to 80°C (-40 to 175°F). Electrical isolation is rated at 4000 Vrms from input to output, with 2500 Vrms between the input/output and ground. The line frequency range covers 47 to 63 Hz.
Performance specifications vary by model voltage class:
- SSRL240 Series (AC or DC Control): Nominal AC Line Voltage of 24 to 280 Vac. Maximum contact voltage drop is 1.6V.
- SSRL660 Series (AC or DC Control): Nominal AC Line Voltage of 48 to 660 Vac. Maximum contact voltage drop is 1.6V.
Response times are documented as:
- Turn-On Time: 20 ms (AC); 05 cycle (DC).
- Turn-Off Time: 30 ms (AC); 05 cycle (DC).
The normal failure condition for these SSRs is 'closed' contacts. A small leakage current exists when the contacts are in the open state, with values specified at 25°C max ambient: SSRL240 models show 0.1 mA at 120 Vac and 240 Vac; SSRL660 models show 0.25 mA across 120 Vac, 240 Vac, and up to 660 Vac.
Configuration Options
The series offers configurable control inputs (AC or DC) and load current ratings from 10 A to 100 A. Models are identified by the format SSRL<Voltage><Control Type><Current>, such as SSRL240DC50.
Electrical Connections:
- Screw terminals labeled 1/L1, 2/T1, 4/A2, +3/A1.
- LED input status indicator included on units.
Fuse Protection and Accessories
A special Fast Blowing I²T fuse is recommended in the load circuit. The series supports various KAX-series fuses (KAX-10, KAX-25, KAX-30, KAX-50, KAX-70) and KBH models (KBH-50, KBH-70). Compatible fuse blocks include FB-1, FB-2, FB-3 for lower current fuses, and BS-101 for higher capacity units.
Thermal Management:
- Finned Heat Sinks (FHS) are required: FHS-1 (2°C/W), FHS-2 (1.2°C/W), or FHS-6 (0.7°C/W).
- The SSRs must be mounted on a finned heat sink or metal plate of adequate size to dissipate heat, as the current-switching rating decreases with temperature.
Additional Options:
- DIN Rail Adaptor (SSRL-DINRAIL-ADAPT) for 10 A models only.
- Shunt Resistors: SSRR20-12, SSRR20-50, SSRR15-12, and SSRR15-50 are available for controllers with AC SSR (Triac) output. Note that 12 W versions are specified for 120 V circuits and 50 W for 240 V.
Key Product Differences
The series is divided into two primary voltage classes based on the nominal AC line voltage:
- SSRL240 Models: Designed for lines up to 280 Vac. Available with AC control signals (90 to 280 Vac) or DC control signals (3 to 32 Vdc). Current ratings include 10 A, 25 A, 50 A, 75 A, and 100 A.
- SSRL660 Models: Designed for lines up to 660 Vac. Available with AC control signals (90 to 280 Vac) or DC control signals (4 to 32 Vdc). Current ratings include 50 A, 75 A, and 100 A.
Control signal turn-on thresholds differ by type: AC models require 90 Vac; DC models for SSRL240 require 3 Vdc (turn-off at 1 Vdc), while SSRL660 DC models require 4 Vdc (turn-off at 1 Vdc). Maximum input current is 10 mA for AC control and 14 mA for DC control. Output peak voltage ratings are 800V for SSRL240 series and 1200V for SSRL660 series.
PDFs & Manuals
Accessories
accessories
FUSE BOX FOR THREE FUSES
$245.91 / each
0 In Stock
Show Ratings & Reviews
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 5 out of
5
by
Dimensional Energy from
Great Product
Omega’s solid-state relays (SSR), particularly the SSR330, SSR660, and SSRL240/660 series, offer impressive performance for industrial and commercial applications. These relays are durable, with no moving parts, allowing for millions of switching cycles—ideal for environments requiring high reliability and low maintenance.
Date published: 2025-08-01
Rated 5 out of
5
by
Remspec from
SolidStateRelay
It just works. Simple and easy to use and install
Date published: 2025-01-07
Rated 5 out of
5
by
Hotshotfps from
Excellent components
Very reliable relays used in our estate automation.
Date published: 2023-12-20
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
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
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
Do these relays come with a heat sink?
Thank you for your inquiry. No, the heat sinks are sold separately.
Date published: 2024-01-09
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