Circuit Interrupting Safety Device Solenoid Reset Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing circuit interrupting safety devices (CISD) are often bulky and difficult to manufacture due to the complexity and arrangement of their parts, and they lack effective mechanisms to prevent mis-wiring and open neutral conditions that can lead to unsafe resets.
Innovation Solution
A CISD design featuring a solenoid with a solenoid pin and contact actuator that disengages upon tripping, using a fireguard circuit with a silicon-controlled rectifier and diode bridge to detect metal sheath current, and movable contact arms biased to a normally open position for quick disconnection, along with a manual reset mechanism that ensures safe reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional circuit interrupting safety devices are designed with multiple separate components for tripping, resetting, and detection, then the device can perform comprehensive safety functions, but the device becomes bulky and difficult to manufacture
Solution Approach 1:
The patent combines the tripping mechanism, reset mechanism, and detection circuitry into a single integrated housing structure. The solenoid assembly integrates the magnetic actuator, contact arms, and reset button mechanism into one unified component that performs multiple safety functions simultaneously, eliminating the need for separate bulky components for each function.
Solution Approach 2:
The solenoid assembly serves multiple functions: it acts as the tripping mechanism when faults are detected, provides the reset function through manual actuation, and incorporates the detection circuitry within the same structural unit. This multi-functional design reduces overall device complexity while maintaining comprehensive safety capabilities.
2Ease of operation
If a reset mechanism is provided that allows easy resetting of the device, then the ease of operation is improved, but the device may be reset even when unsafe conditions exist (mis-wiring or open neutral)
Solution Approach 1:
The detection circuit continuously monitors the electrical conditions and provides feedback to the solenoid assembly. Before allowing reset, the circuit verifies that safe operating conditions exist (proper wiring, no open neutral, no ground faults). The solenoid only permits contact closure when the detection circuit confirms safe conditions, preventing unsafe resets while maintaining ease of operation when conditions are appropriate.
Solution Approach 2:
The detection circuit performs preliminary verification of safe operating conditions before the reset function is activated. The system checks for proper wiring and absence of faults in advance of allowing the reset mechanism to close the contacts, ensuring that reset only occurs when safe to do so.
3Reliability
If the device uses a complex arrangement of parts to ensure safety, then the reliability is improved, but the manufacturing process becomes difficult and time-consuming
Solution Approach 1:
The solenoid assembly integrates multiple safety components into a single manufacturable unit. The housing, contacts, spring mechanisms, and detection circuitry are combined into one assembly that can be manufactured as a single integrated component or pre-assembled module, significantly simplifying the manufacturing process while maintaining all necessary safety functions.
Solution Approach 2:
The device is segmented into modular components: the solenoid assembly as a separate module, the detection circuit as an integrated module, and the housing as a structural module. This segmentation allows each module to be manufactured independently using optimized processes, then assembled through standardized interfaces, improving overall manufacturing efficiency while ensuring safety through modular verification.
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
The design enhances manufacturing efficiency, improves safety by preventing unsafe resets, and provides effective detection and disconnection of power in case of faults, such as arcing conditions, while meeting UL 943 and NEMA 3R rating requirements.
Implementation Method 1
A solenoid having a solenoid pin is provided.
Implementation Method 2
provides effective detection and disconnection of power in case of faults, such as arcing conditions
Implementation Method 3
using a fireguard circuit with a silicon-controlled rectifier and diode bridge
Data Source
AI summary
A circuit interrupting safety device (CISD) interrupts the flow of current through a pair of lines extending between a source of power and a load. The CISD includes a column reset assembly functioning as a circuit breaker and a contact actuator, a relay circuit including a solenoid, and a fault detecting circuit packaged in a circuit assembly. The solenoid includes a solenoid pin in an extended state when the CISD is reset and a non-extended state when the CISD is tripped.