Circuit Breaker Trip Actuator Assembly Orientation
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Solution Overview
Problem
Integrating a new trip unit feature or electronic trip mechanism into circuit breakers is challenging due to space constraints within the housing, requiring significant modifications or alterations.
Innovation Solution
A trip actuator assembly with a frame and interface assembly that secures the trip actuator in a desired orientation within the circuit breaker housing, utilizing a solenoid actuator, interface element, and reset button to effectively trip open separable contacts without extensive modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new trip unit feature or electronic trip mechanism is integrated into the circuit breaker housing, then the functionality and reliability of the circuit breaker is improved, but the device complexity and manufacturing difficulty increase due to space constraints and required modifications to the housing
Solution Approach 1:
The trip actuator assembly is divided into separate functional components: the trip actuator mechanism, the interface assembly with interface element, the frame structure, and the reset button assembly. This segmentation allows each component to be optimized independently and assembled into the existing housing without requiring complex integration modifications
Solution Approach 2:
The frame structure serves multiple functions: it provides mechanical support for the trip actuator, defines the mounting portion geometry, guides the interface element movement, and structures the overall assembly to fit within the housing compartment. This multi-functionality reduces the number of separate components needed
2Ease of manufacture
If the trip actuator assembly is designed to fit within the existing circuit breaker housing compartment, then the ease of manufacture and installation is improved, but the available space for components is limited, restricting design flexibility
Solution Approach 1:
The assembly utilizes the three-dimensional space within the housing compartment efficiently by arranging components in multiple dimensions. The frame structure creates a mounting portion that extends into the compartment, allowing the trip actuator and interface assembly to be positioned in different spatial zones rather than competing for linear space
Solution Approach 2:
The interface assembly is positioned within the space defined by the frame structure, and the trip actuator is disposed at or about the mounting portion. This nested arrangement allows multiple components to occupy overlapping or adjacent spatial zones, maximizing space utilization within the housing compartment
3Ease of operation
If the interface assembly is movably coupled to the frame, then the ease of operation and resetting is improved, but the device complexity increases due to additional moving parts and coupling mechanisms
Solution Approach 1:
The interface assembly is designed to be reset by the reset button through direct mechanical interaction. When the reset button is actuated, it automatically moves the interface element back to its initial position through the movable coupling, eliminating the need for manual adjustment or complex resetting procedures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables a compact and effective trip actuator assembly that operates within the circuit breaker housing without significant modifications, ensuring reliable tripping of separable contacts in response to overcurrent conditions.
Implementation Method 1
utilizing a solenoid actuator
Data Source
AI summary
A trip actuator assembly is provided for an electrical switching apparatus, such as a circuit breaker. The trip actuator assembly includes a trip actuator with an actuating element, which is movable among unactuated and actuated positions corresponding to separable contacts of the circuit breaker being closeable and tripped opened in response to a trip condition, respectively. The trip actuator is disposed at a mounting portion of a frame. An interface assembly is movably coupled to the frame and includes an interface element disposed between the actuating element of the trip actuator and a portion of the circuit breaker operating mechanism. When the actuating element moves from the unactuated position toward the actuated position, it engages and moves the interface element, thereby moving the operating mechanism to trip open the separable contacts. The frame secures the trip actuator assembly in a desired orientation within a corresponding one of the housing compartments.