The secondary control circuit of the intermediate relay self-locking1、Physical wiring diagram&Circuit diagram2、Operation principle Close QF to connect the power supply. Press the start button SB2, the coil of the intermediate relay gets electricity. The normally open contact 9-5 is closed to conduct the power supply. The intermediate relay is self-locked and the load starts to operate. Press the stop button SB1, the coil of the intermediate relay loses electricity. The normally open contact

Physical diagram of interlock of 14-pin intermediate relayThe circuit diagram of interlock for 14-pin intermediate relays

1). What is an inverse time over current relay’s characterizing feature?The length of time that the relay operates will be reduced as the fault current increases.2). Mention the most important characteristics of relay contacts. A strong construction is required. Self-cleaning (oxides break-down quickly). Corrosion- resistantis a characteristic. Low contact resistance with no strictures and no bounces. Capable of transporting rated short-term current and also rated continuous current.3). Define p