The difference between a relay and a circuit breaker is that relays act as sensors while circuit breakers break connections. A relay acts as an amplifier that can convert one low voltage signal into multiple high voltage ones. At the same time, the circui. The difference between a relay and a circuit breaker is that relays act as sensors while circuit breakers break connections. A relay acts as an amplifier that can convert one low voltage signal into multiple high voltage ones. At the same time, the circuit breaker is only capable of disrupting the flow of electricity to the entire circuit. Primary. Arelay is an electronically generated switch. The internal mechanical shift is operated when the relay normally uses the electromagnet (coil). The power is turned ON for a circuit when relay points open, and the electromagnet is activated.The relay has contacts in which main contacts are used to shift the circuit and contacts for the loop. A relay contains an alternate voltage trigger; this trigger voltage is when the relay coil operates and normally shifts close to the open and open to the close within the circuit. It is utilized for shifting electronic machines in electronic circu. A small power circuit can handle multiple high current circuits using a relay. It has the following advantages: 1. The control switch to the relay should be connected with Lightweight cables with less Diametre will take up less space. 2. Voltage loss is deducted considerably as power is redirected to the device through the shortest possible path. 3. Generally, for a 4-pin relay, there are two types readily accessible; normally open and normally closed. Two kinds of pins are used (85 & 86) to regulate the coil, and 2 pins are used (30 & 87) to switch power on a single board/circuit. In the case of normally open, when the coil is stimulated, the relay will start the power ON for the circuit. For.