Automatic protection devices are designed to reliably shut down engines during emergency operation. They protect against overload, short circuit, phase failure and unacceptable voltage drop. Available in both single-phase 220 V and three-phase 380 V versions.
The principle of operation of circuit breakers for motor protection
The device continuously monitors the current consumed by the motor. If the nominal value is slightly exceeded, but for a long time, thermal protection based on a bimetallic plate is triggered. In case of a sudden current surge (short circuit), the electromagnetic release is instantly activated.
After troubleshooting, the switch is ready for operation again - it is enough to return the handle to the on position.
Types of automatic motor protection
- Thermomagnetic is a classic solution with a bimetallic plate and a short-circuit coil. They are independent of external power supply, reliable, affordable.
- Electronic devices are equipped with a microprocessor and measuring transformers. They are more precisely configured, control the phase asymmetry and transmit data to the dispatching system.
How to choose a circuit breaker to protect the motor
When buying, consider the following points:
- Rated current of the motor. The machine is selected strictly according to the operating parameter of the motor indicated on the nameplate. The adjustment allows you to accurately set the value in a preset range.
- Switching capacity. It must correspond to the short-circuit current at the installation point.
- Availability of additional functions. Phase break protection with thermal compensation, remote control, alarm contacts.
Advantages of using automatic motors
- Complete protection of the electric motor in one compact housing. There is no need to order a separate thermal relay and circuit breaker.
- Specialized automatic motors do not shut down at every start, but they react instantly to a real accident. This prolongs the life of the engine and eliminates unplanned equipment downtime.
Installation and configuration recommendations
The installation is performed on a DIN rail in the control panel. Before setting up, check the rated current of the motor according to the data sheet. The setpoint regulator is set with a small margin (usually 5-10% higher than the operating current).
After installation, be sure to perform a test run and make sure that the engine starts steadily and the protection does not work incorrectly. Periodically check the reliability of the contact connections.
Reasons to order from us
A wide range of automatic motor protection devices is available in the CHIP and DIP online store: from inexpensive thermomagnetic models to programmable electronic devices. By buying here, you can be sure of a favorable price and timely delivery. This is due to the fact that we work with reliable suppliers. Delivery is carried out all over Russia.
You can receive an order at our office and pick-up point in Yerevan. Delivery of goods is carried out throughout Armenia by courier and Haypost.
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Products from the group «Motor protection circuit breakers» you can buy wholesale and retail.