Difference between Circuit Breaker UL489 and UL1077

Introduction to the tripping curves of UL 489 miniature circuit breakers and UL 1077 equipment circuit breakers. The trip curve (also known as the time current curve or the trip curve) can be a daunting topic. The purpose of this article is to introduce you to the concept of trip curves and explain how to read and understand them. To understand the tripping curve of circuit breakers, two important international standards UL489 and UL1077 are indispensable.

So what is UL?

UL refers to Underwriters' Laboratories (UL), established in 1894 and affiliated with the Underwriters Electrical Bureau and the National Fire Underwriting Service. The establishment of UL is mainly for the fire safety of electrical products. These products include the circuit protection devices discussed in this article.

電路保護裝置

Circuit protection is used to protect wires and electrical equipment from damage, overload, short circuit, or grounding faults in the event of an electrical accident. Thunderstorms, overloading of power sockets, or sudden surges may pose a danger, potentially causing fires, equipment damage, or personal injury. The circuit protection function aims to eliminate this risk by cutting off the power supply of the circuit, in order to prevent such situations from occurring.

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