1D40UR

Series:	*
Part Status:	Active
Lead Free Status / RoHS Status:	--
Moisture Sensitivity Level (MSL):	--

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Introduction

Circuit breakers are devices used to protect electrical circuits and other electrical systems from overloads and short circuits. They are designed to detect faults or excessive currents in the electrical system and disconnect the circuit in order to prevent damage or injury. The 1D40UR is a type of circuit breaker and it is important to understand its application field and working principle in order to properly use it in the field.

Application Field

The 1D40UR is a UL 489 rated, Type 1D 24-volt, 40-ampere current limiting circuit breaker. It has been specifically designed for applications with a wide range of industrial, commercial, and residential installations. It is approved for branch circuits, branch-circuit panelboards, feeders, and service entries. This breaker can also be used for replacement breaker applications in existing installations where a compatible size and current rating are required.

Working Principle

The 1D40UR is designed to protect the electrical system from overload, short circuit, and fault current. It is equipped with a current sensing thermal-magnetic element that reacts quickly to fault current and short-circuit conditions. Once the current exceeds the breaker’s rating, the element sends a trip signal to the breaker which causes it to open. In normal conditions, the breaker operates as a thermal-magnetic device. The thermal element responds to overloads based on a programmed time/current curve. It has a manual “Trip Reset” button which must be operated in order to reset the breaker after it has been tripped. The breaker also has an automatic lockout feature which prevents the breaker from being reset until the tripped condition is corrected. This lockout is designed to protect people and equipment from potential harm due to recurring faults.

Conclusion

The 1D40UR is a UL 489 rated, Type 1D 24-volt, 40-ampere current limiting circuit breaker that is well-suited for a wide range of residential, commercial, and industrial applications. It operates as a thermal-magnetic device, utilizing a current sensing element to detect faults and short-circuit conditions and an automatic lockout feature to help prevent re-occurrences. It has a manual “Trip Reset” button which must be operated in order to reset the breaker and restore power. Understanding the application field and working principle of the 1D40UR will enable engineers and technicians to properly use this breaker in the field and reduce the risk of damage or injury.

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