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What are the pins on a relay?
A normally open relay will switch power ON for a circuit when the coil is activated. A normally closed relay will switch power OFF for a circuit when the coil is activated. 5 pin relays provide 2 pins (85 & 86) to control the coil and 3 pins (30, 87 & 87A) which switch power between two circuits.
What is pin 86 on a relay?
Realizing that 85 and 86 are the coil pins, these pins will be transferring the current through the coil. 85 will be used to ground your relay, while 86 will be connected to the switchable power. 87 and 87a will be connected to your controlled accessories that you wish to turn on and off with your relay.
What is the use of COM pin in relay?
COM (Common): This is the pin you should connect to the signal (mains electricity in our case) you are planning to switch. NC (Normally Closed): A normally closed configuration is used when you want to turn off the relay by default.
Where does the current go in a 5 pin relay?
Current splits inside the relay, supplying power to both the control and load circuits. A 5-PIN relay has a single control circuit, but two separate current paths for the switch: One when the relay is de-energized (OFF – no current through the control coil) and the other the energized (ON – current is flowing through the control coil).
How many terminal pins are in a SPST relay?
Such relay can categorized into normally open or normally closed type. ii) Single Pole Double Throw (SPST) – Such relay has 5 terminal pins which consists of a pair of coil pins, a common pin, a normally open (NO) pin and a normally closed (NC) pin.
How are relays used in a control panel?
Relays are normally used in the control panels, manufacturing and building automation to control the power along with switching the smaller current values in a control circuit.
What kind of wiring is needed for a relay?
These relay diagrams focus on the wiring configuration in a 2-pole relay circuit. One is the square, and the other one is round, but their functioning is similar to each other. The coil wire will connect to pin 2 and pin seven on the socket for the wiring.