Relay showing voltage while contacts open

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    Relay Voltage
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The discussion centers on a simulation issue with a normally open contact relay in Multisim, where a voltage of about 15mV is observed on the circuit side when the contacts are open. Participants inquire whether this voltage reading is normal and suggest checking initial conditions and connections to determine if it is a floating node or leakage from a solid-state relay. They also request a schematic screenshot for better analysis. The conversation emphasizes the importance of understanding the relay model and simulation settings to troubleshoot the voltage anomaly effectively. Overall, the issue highlights common challenges in simulating relay behavior in circuit design software.
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Hi, I am simulating a switch system on multisim which I have constructed using a normally open contact relay. The problem I am having is that before the coil is energised, I am observing about 15mV on the main circuit side when the contacts are supposedly open. Is this normal? When the coil is energised and the contacts close, the voltage raises to the value of the supply as would be expected?
 
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Physicist3 said:
Hi, I am simulating a switch system on multisim which I have constructed using a normally open contact relay. The problem I am having is that before the coil is energised, I am observing about 15mV on the main circuit side when the contacts are supposedly open. Is this normal? When the coil is energised and the contacts close, the voltage raises to the value of the supply as would be expected?

Can you post a screenshot of the schematic? If you explicitly set the Initial Conditions with 0V on that side before starting the simulation, does it stay zero for some time before you close the relay? Is it just a floating node, or is there something connected to it?
 
If it is a solid state relay it could be leakage. What is your relay model?
 
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