In STEP8, the white lamp is turned on using an electromagnetic relay. To turn off the lamp, the circuit breaker has to be cut off. In STEP9, create a circuit where the white lamp is turned off by pressing BS3 (switch 3).
Key point
For the switch 3, b-contact shall be adopted. With b-contact, the contacts are conductive when the switch is not pressed, and are open when the switch is pressed.
Question
In STEP8, the white lamp is turned on using an electromagnetic relay. To turn off the lamp, the circuit breaker has to be cut off. In STEP9, create a circuit where the white lamp is turned off by pressing BS3 (switch 3).
Key point
For the switch 3, b-contact shall be adopted. With b-contact, the contacts are conductive when the switch is not pressed, and are open when the switch is pressed.
Devices to use