The function of intermediate relay

The intermediate relay has the functions of amplification, isolation and protection in the control circuit, including: amplifying weak signals to control larger current loads; providing electrical isolation to prevent the control signal and load from interfering with each other; protecting the load from Overcurrent, overvoltage or short circuit damage.

The role of the intermediate relay

Introduction
The intermediate relay is an electromagnetic Switch, which plays a vital role in control circuits, has the functions of amplification, isolation and protection.

Amplification
One of the functions of the intermediate relay is to amplify weak signals. When the current in the control circuit is too weak to drive the load directly, an intermediate relay can be used to amplify the signal. When the relay coil is energized, it generates a magnetic field that drives the contacts to close or open, thereby controlling a load with a larger current.

Isolation
The intermediate relay can also provide electrical isolation. The control circuit and the load circuit are physically separated from each other, thus preventing the control signal from interfering with the load, or the load failure affecting the control circuit.

Protection
The intermediate relay can protect the load from overcurrent, overvoltage or short circuit. When the load circuit fails, the relay will disconnect the circuit to prevent excessive current from damaging the load or causing safety hazards.

Working principle
The working principle of the intermediate relay is very simple. When the control current flows through the coil, a magnetic field is generated, which drives the iron core to move. The movement of the core causes the contacts to close or open, changing the state of the load circuit.

Application
Intermediate relays are widely used in various electrical equipment, including:

• Control motors and solenoid valves
• Protection Power system
• Provides isolation and amplified signals

Differences from general relays
Compared with general relays, the intermediate relay has greater power and contact With a larger number of points, larger current loads can be controlled. In addition, intermediate relays are usually installed in control panels or distribution boxes for easy maintenance and replacement.

The above is the detailed content of The function of intermediate relay. For more information, please follow other related articles on the PHP Chinese website!