Contactors versus Relays – Differences and Applications

Although the are similarities in operating theory, relays and contactors are used in industrial circuits for different specific applications, and should not be used interchangeably. Relays and contactors are widely used in industrial automation applications. Both these terms for components are used interchangeably by many engineers. Both the devices act like switches and both of … Read more

Motor Protection Circuit Breaker (MPCB)

Motor Protection Circuit Breakers are a Specialized Types of Electrical Protection Device. that can be use for Motor Protection Provided both short circuit and overload protection for individual motor loads  are available for a wide range of motor sizes and installation types. What is motor protection?  Motor protection and control. Motor protection is used to prevent damage to the electrical motor, such … Read more

Basic of MCCB (Molded Case Circuit Breaker)

Molded Case Circuit Breaker (MCCB) is a circuit breaker and trip device assembled in a mould case. Also it can automatically cut off electric power in case of overload and short circuit. It is meant for higher rated current and is commonly used in Industrial applications. Depending upon the application and required protection, an MCCB … Read more

Thermal Overload Relay

Thermal overload relays are economic electromechanical Protection devices for the main circuit. They offer reliable protection for motors in the event of overload or phase failure. The thermal overload relay can make up a compact starting solution together with contractors. Overload relays Protect a motor by sensing the current going to the motor. Many of these use small heaters, often bi-metallic elements that bend when … Read more

RCCB (Residual Current Circuit Breaker)

RCCB means Residual Current Circuit Breaker — A residual current device (RCD), or residual current. circuit breaker (RCCB), is an electrical wiring device that. disconnects a circuit whenever it detects that the electric. current is not balanced between the phase to neutral. A RCCB is an essential current sensing equipment used to guard a low voltage circuit from … Read more


Contactor: A Contactor is an electrically-controlled switch used for switching an electrical power circuit. A Contactor is typically controlled by a circuit, which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 230-volt motor switch. General-purpose  Relays contactors are designed to be directly connected to high-current load devices. Relays tend … Read more


Relay:  A relay is a switching device as it works to isolate or change the state of an electric circuit from one state to another. Different Types of Relays. Classification or the types of relays depend on the function for which they are used. A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, … Read more

MCB and MCCB Difference

Difference Between MCB (Miniature Circuit Breaker) and MCCB (Moulded Case Circuit Breaker) MCB MCCB Current Rating About Up to 63 Amp About Up to 1000 Amp Cost Less Very High Size Small Big Trip Level Generally Fixed   Variable Interrupting Capacity About Up to 10 KA About Up to 10 KA – 100 KA Under Voltage Trip – Yes Shunt … Read more

What is MCB ?

MCB – A miniature circuit breaker automatically switches off electrical circuit during an abnormal condition of the network means in overload condition as well as faulty condition. Nowadays we use an MCB in low voltage electrical network instead of fuse. The fuse may not sense it but the miniature circuit breaker does it in a more reliable way. … Read more