800 Amp 4pole Electric Mccb Molded Case Circuit Breake

A 800 amp 4pole electric mccb molded case circuit breaker could equips thermal magnetic trip unit or electronic trip unit to meets different demand of client. Ever more, the expansion unit, such as undervoltage trip coil, residual current device and motor protection unit, allows a 800 amp 4pole electric mccb molded case circuit breaker to achieve more function to meet application demand. The introduction protection function is showed as the below.

Protection functions of thermal magnetic trip units:

1. Overload protection:

When the circuit current exceeds the rated value, the bimetal strip of a 800 amp 4pole electric mccb molded case circuit breaker heats up and bends, which actuates the trip mechanism. The tripping time is inversely proportional to the square of the current.

2. Short circuit protection:

In the event of a short circuit, a high fault current generates electromagnetic force, which drives the trip mechanism to operate almost instantly.

Thus, thermal magnetic 800A 4 pole MCCBs typically provide two stage protection, which is long time delay protection and instantaneous protection. It also called non selective type.

Protection functions of electronic trip units

1. Overload protection:

A microprocessor on a 800 amp 4pole electric mccb molded case circuit breaker continuously monitors and calculates the circuit current to deliver accurate protection.

2. Short circuit protection:

A preset delay on a 800 amp 4pole electric mccb molded case circuit breaker is applied during short circuit conditions to achieve selectivity.

3. Short circuit protection:

Under severe fault conditions, the 800 amp 4pole electric mccb molded case circuit breaker trips without delay to isolate the circuit.

4. Ground fault protection:

It is designed to detect and interrupt ground fault currents on a  800 amp 4pole electric mccb molded case circuit breaker.

Thus, an electronic 800A 4P MCCBs generally provide four stage protection, which is long time delay protection, short time delay, instantaneous protection, and ground fault protection. The electronic 800A 4P MCCB is also called selective type MCCB.

Additional protection features:

1. Undervoltage protection:

A 800 amp 4pole electric mccb molded case circuit breakers are also could equipped with an undervoltage release that automatically trips the 800A molded case circuit breaker when the supply voltage falls below a defined threshold.

2. Residual current protection:

Certain versions, such as leakage protection types, can detect earth leakage and provide protection against electric shock.

3. Motor protection:

Motor protection MCCBs are specifically designed for motor circuits, often using D type trip characteristics to accommodate high inrush currents during startup.

800 amp 4pole electric mccb molded case circuit breaker parameter: