Why is a relay used to control most motors?
Control relays are electronic parts that are used in motors, power plants, power supply systems, transistors, and more. Control relays permit a low current circuit to control a high current circuit. When the current stops flowing through the coil, the switch opens.
How does a relay get damaged?
In fact, the life of a relay is essentially determined by the life of its contacts. Degradation of contacts is caused from high in-rush currents, high- sustained currents, and from high voltage spikes. Relays can also fail due to poor contact alignment and open coils.
Can a relay be used to control a motor?
Because of that, relays that are designed to control motors usually have a motor power rating. Applying a derating factor to the relay’s resistive current rating is not the best way to select a relay for controlling a motor. The inductive rating that you have in this case does not necessarily apply to motor control use.
Can a single phase motor kill a relay?
1.) Would it kill a relay if i use a 1HP 220v 8a single phase motor to drive a bridge forward, (it’s about 1200 lbs not that sure yet though hehe) A relay used to energize any motor must be rated for motor duty. It must be capable of handling the motor inrush current.
What is the inductive load rating for an AC relay?
The Songle SRD-05VDC-SL-C data sheet found here lists the form C inductive load rating as 3A 120VAC. No inductive load rating is given for 240VAC and no mention is made of motor duty. Relays used for motor control must be capable of switching the motor starting or locked-rotor current which can be much higher than the normal running current.
Is it OK to use a relay at 120 volts?
If you are using the relay at 120 volts, it might be ok, but if you have tried it and are having problems, that probably proves it is not ok. If your voltage is 240 volts, it would not be at all surprising that the relay is failing.