Circuit Breaker Control Unit With Front-Insert Wireless Module Isolation
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Solution Overview
Problem
Existing electrical circuit breakers with wireless communication interfaces require the control unit to be removed from its receptacle for connection, which is impractical and risks damage to the bulky external casing, and do not ensure sufficient electrical isolation for safety.
Innovation Solution
A modular control unit with a communication module that can be installed from the front without removing the control unit from its receptacle, featuring recessed electrical contact pads and an insulating envelope that maintains isolation distances and creepage distances according to IEC 947-1:2019 standards, ensuring safety and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless communication interface is added to the control unit, then communication capability is improved, but the device complexity and safety isolation requirements increase
Solution Approach 1:
The control unit is divided into a fixed part (control unit proper) and a removable communication module. This segmentation allows the communication functionality to be added or removed independently, improving versatility without permanently increasing the complexity of the core control unit.
Solution Approach 2:
The communication module is designed to be nested within the control unit's receptacle. The module fits into a dedicated housing space, allowing it to be integrated when needed and removed when not needed, providing communication capability without permanently altering the control unit's complexity.
2Adaptability or versatility
If an external communication unit with casing is used, then communication capability is improved, but the ease of operation deteriorates due to removal requirement
Solution Approach 1:
The communication module combines the communication interface and antenna into a single integrated unit that fits within the control unit's receptacle. This merging eliminates the need for separate external casings and connection cables, allowing users to install or remove communication functionality by simply inserting or extracting the module from the front of the control unit.
3Ease of operation
If electrical contact pads are placed on the front face for communication connection, then ease of operation is improved, but safety isolation is compromised
Solution Approach 1:
The electrical contact pads are positioned in the depth dimension of the control unit rather than on the front surface. The contact pads are located on the printed circuit board inside the housing, recessed from the front face by a distance that maintains the required clearance and creepage distances for safety isolation, while still allowing front-accessible connection through the communication module.
4Device complexity
If communication module is integrated into control unit, then device complexity is reduced, but the ease of repair deteriorates
Solution Approach 1:
The communication module is designed as a separate, removable component from the main control unit. This segmentation means that if the communication module malfunctions, users can simply remove the entire module and replace it with a new one without needing to diagnose or repair internal components of the control unit itself, significantly improving ease of repair.
Data Source
AI summary
This control unit (20) comprises a casing (30) defining a front plane (P22) where a housing (401), configured to receive a communication module (400) in an assembled position, opens. Contact pads (36) are arranged at the bottom of the housing recessed from the front plane (P22), so that a clearance distance between each contact pad and the front plane is greater than a class 2 isolation distance, according to the IEC 947-1:2019 standard, under a voltage greater than 690 V. The communication module comprises an envelope (410), which delimits a cavity (411), configured to receive a wireless communication card (414) and which in an assembled position of the casing, closes the housing, so that a creepage distance between each contact pad and the front plane is greater than a class 2 isolation distance under a voltage greater than 690 V according to the IEC 947-1:2019 standard.