When a circuit fault is detected, voltage monitoring relays are designed to trip a circuit breaker. Protective relays that must operate if the phase sequence is reversed or if one or more phases of a three-phase supply are lost are known as voltage monitoring relays. Electromechanical relays are the only significant evidence of the source and location of a fault. In most cases, a single microprocessor relay can replace two or more electromechanical devices. Energy consumers face challenges and considerations when it comes to how they use energy due to the large range of load types and requirements.