Circuit Breakers

The IULN211-1REC4-27900-4 is an integral current limiting circuit breaker, one of the most important types of overcurrent protection devices. It serves to limit the amount of current that can pass through an electrical system, while at the same time providing isolation and electrical short-circuit protection.

Current limiting circuit breakers are used in low-voltage systems, typically ranging from 600 volts to 4,300 volts. These types of circuit breakers are typically used in residential, commercial, and industrial applications, such as air conditioning, refrigeration, and equipment protection.

Application Field

Current limiting circuit breakers can be used in a variety of applications, and are particularly popular for air-conditioning, refrigeration, and industrial equipment protection applications. They are also used in emergency lighting systems, hotels, and stores, as well as in hospitals, factories, and laboratories. In addition, the IULN211-1REC4-27900-4 is suitable for indoor or outdoor use in high ambient temperatures.

Due to their high current-limiting capability and excellent thermal properties, the IULN211-1REC4-27900-4 is also suitable for use in environments where a higher level of current is likely to be required. In particular, the breaker is well-suited for use in motor starters, welding transformers, and solar photovoltaic systems, as well as for current limiting in a variety of other applications.

Working Principle

The IULN211-1REC4-27900-4 operates on the principle of a thermal overcurrent trip device. When the current passing through the breaker exceeds the predefined trip setting, the breaker triggers a release mechanism, which causes the contacts to open and break the circuit. The current limiting effect is caused by the thermal expansion of the component materials, which causes the contacts to move away from each other and prevent further current flow.

The IULN211-1REC4-27900-4 is designed such that current protection is provided at two stages. First, the thermal action causes the contacts to move apart and cut off the current flow. The second stage is a trip mechanism which mechanically disconnects the contacts from the circuit. The thermal action also actuates a fusible time delay element, further preventing excessive current flow.

The IULN211-1REC4-27900-4 is also designed with an overload protection feature, which prevents operation of the breaker due to excessive current. This is accomplished by limiting the amount of current that can pass through the breaker.

In conclusion, the IULN211-1REC4-27900-4 provides an important form of overcurrent protection for low-voltage systems, by limiting the amount of current that can pass through the circuit. It also provides isolation and protection against electrical short-circuiting, and is suitable for use in many applications, including air conditioning, refrigeration, and equipment protection.