Protective Switch Details TRIZ Cases

Contact voltage noise length and amplitude reveal relay wear under real load conditions, enabling earlier failure prediction and timely replacement.

A timed outlet control circuit briefly cuts voltage after current detection, helping a shocked person release contact before severe injury.

A single broadband di/dt sensor with an active integrator detects arc faults across low and high frequencies while reducing breaker complexity.

A force sensor at the stationary core base infers contact force in a mechanical contactor, avoiding high-potential measurement while revealing wear or faults.

Replacing thermoset resin with aromatic polyamide in the arc chamber base cuts curing time, improves property stability, and enables recycling.

A two-part rocker arm blocks switch movement in defined ON or OFF positions, enabling secure locking without extra tools or complex assemblies.

A meter-mounted disconnect section combines source switching, surge protection, and lockout to isolate grid and backup power quickly in emergencies.

A slider-and-housing interlock module lets two contactors be mounted or removed without dismounting one first, cutting assembly effort and time.

An optical emitter-receiver tracks main shaft stroke without short-life rotary sensors, helping detect breaker abnormalities and wear.

Current peak counting estimates fuse remaining life without precise voltage diagnostics, simplifying vehicle fuse maintenance and replacement.

Floating contact arms on an axle replace interference-prone shunts, reducing deflection, wear, and torque limits in circuit breakers.

Detects unintentional contact separation during short-circuit faults, then opens the contactor to prevent reclosure and contact welding.

A rotating interlock blocks one of two switchboard control levers, preventing simultaneous source closure without modifying existing apparatuses.

An optical sensor and sticker track pushrod displacement to detect vacuum circuit breaker contact wear before maintenance becomes critical.

An optical emitter-receiver sensor tracks main shaft motion to detect breaker wear and operation abnormalities without short-life rotary sensors.

A square-pin hammer drives the latch into the switch shaft shelf to stop rebound and prevent unintended contact re-closure.

Bendable branch conductors replace rigid bus bars to fit changing breaker layouts, reduce hot spots, and avoid full assembly replacement.

Integrating relay and control assemblies with wireless signaling cuts wiring and switch size for compact low-current remote control.

Shunt-resistor voltage differences after switch-off reveal deterioration in each multipole relay pole for more accurate maintenance timing.

A dual-contactor panelboard in one enclosure enables selective load switching during maintenance while reducing footprint, cost, and downtime.

A tab-and-hook double wall reinforces the switch housing to contain short-circuit arc pressure and prevent structural damage.

Grouped circuit breaker control on hierarchical aircraft displays cuts pilot workload, speeds switching, and reduces input errors.

A magnetic flux compensation member stabilizes relay secondary current in air circuit breaker transformers while reducing core heat and fire risk.

Optical sensing under the switchgear truck tracks actuator piston displacement to detect contact erosion without adding hardware inside the vacuum interrupter.

A test signal and frequency filtering let a Rogowski coil estimate busbar temperature without added sensors in tight, high-voltage interrupters.

A split-bus dual-contactor panelboard switches separate load groups in one explosion-proof enclosure, cutting footprint, cost, and downtime.

A built-in detection coil and communication module measure switch current without external modules, cutting size and weight while enabling overcurrent detection.

A partition wall and ultrasonic welding create a sealed cavity that blocks dust ingress and improves auxiliary contact reliability.

A controller opens only the faulted phase in medium-voltage switchgear, isolating single-phase overcurrent while keeping the other two phases energized.

A faceplate-mounted linear actuator and delay relay automatically reset tripped GFCI outlets, cutting manual reset trips during testing.

Magnetic attraction replaces screw terminals in tight panel spaces, enabling fast cable attachment with secure retention and low contact resistance.