2. Single Pole Double Throw (SPDT) has five terminal legs, three terminal legs are used as contact points (switches) and two other terminal legs are used as electromagnetic coils. Three terminals are used as contact points one as a pole and two as a throw.
3. Double Pole Single Throw (DPST) has six terminal legs, four feet as point contact terminals (switches) and two other terminal legs used as electromagnetic coils. Four terminals used as contact points consisting of two pairs of single pole double throw switches.
4. Double Pole Double Throw (DPDT) has eight terminals, six terminals are used as contact points (switches) and two terminals are used as electromagnetic coils. Six terminals used as contact points consisting of two pairs of single pole double throw switches.
Relay works to control the flow of electricity by opening and closing a circuit. When there is an electric circuit that is opened, then there are parts of the circuit that is closed. This one tool is used to control the flow of small electricity in the circuit. This tool can be used to control a large flow of electricity provided that its use is combined with amplifiers . The use of this tool is usually accompanied by a protector to prevent damage to equipment by detecting irregularities in the flow of electricity. Its use can also be accompanied by a starting coil, temperature control elements, pilot lights, and also an alarm sound. Inclusion with other devices is usually adjusted to the needs that exist.
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