Compressor Start Relay (Solid State Relay) Manufacturer,Supplier and Exporter in India
Product Code : EL-RACLE-12849
Jlab Export is a leading Compressor Start Relay (Solid State Relay) Manufacturer,and suppliers in India
Solid-state switching sets this compressor start relay apart from the current type. It uses SCRs (silicon controlled rectifiers) instead of a coil and moving contacts, so nothing arcs, wears or has to hang upright. The relay has four terminals and is compatible with temperature controllers.
Specifications
| Relay type | Solid state relay |
| Switching element | SCR (silicon controlled rectifier) |
| Terminals | Four |
| Compatible with | Temperature controllers |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Lab Exercises on Solid-State Switching
Students begin by comparing it on the bench with the current-type Compressor Start Relay. They pick out the control terminals and the load terminals and discuss why there is no moving armature. On most four-terminal solid state relays, two terminals take the control signal and two switch the load.
The Dual-Application Commercial Refrigeration Training Unit has electronic temperature control. It is a good starting point for showing how a controller output can drive a solid-state switch. With a Digital Multimeter, students measure the voltage across the load terminals with the relay off and on. It falls close to zero when the SCRs conduct.
Frequently Asked Questions
How does a solid state start relay differ from a current relay?
It has no coil, armature or contacts. SCRs switch the circuit, so there is no contact arcing or wear and no clicking. Its mounting position does not matter, whereas a current relay has to sit upright to work.
Why does a solid state relay get warm?
When the SCRs conduct they drop a small voltage, and that voltage times the load current turns into heat. Mount the relay on a metal surface or heat sink with free air around it, and keep it away from hot compressor parts.
How do I check it with a multimeter?
An ohmmeter test on the load terminals tells you little, because the SCRs only conduct with the supply on. Test it in circuit instead. With the control signal on, the voltage across the load terminals should be near zero, and with it off, close to the full supply.
Can it be driven by a temperature controller?
Yes, it is compatible with temperature controllers. The controller output goes to the control terminals and the relay switches the load. Check that the controller output type and voltage suit the relay input before wiring.
Other Compressor Controls and Relays
- Hard Start Kit
- Compressor Protection Overload
- Thermostats 3 (freezing compartment)
- Sequence and Phase Fail Relay (three-phase supply)
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Last updated: 5 November 2026
