Abstract:
A circuit protection device including a positive temperature coefficient (PTC) device and a backup fuse electrically connected in series with one another, the backup fuse comprising a quantity of solder disposed on a dielectric chip and having a melting temperature that is higher than a trip temperature of the PTC device, wherein the a surface of the dielectric chip exhibits a de-wetting characteristic relative to the solder such that, when the solder is melted, the solder draws away from the surface to create a galvanic opening in the backup fuse.
Abstract:
Bei einem Fehlerstromschutzschalter (1) mit einem Summenstromwandler (2), welcher Primärwicklungen (3) sowie eine Sekundärwicklung (4) und eine Tertiärwicklung (6) aufweist, wobei die Sekundärwicklung (4) mit einer netzspannungsunabhängigen Auslöseelektronik (5) schaltungstechnisch verbunden ist, wobei die Tertiärwicklung (6) mit einer netzspannungsabhängigen Auslöseelektronik (7) schaltungstechnisch verbunden ist, wird vorgeschlagen, dass der Fehlerstromschutzschalter (1) eine Steuerelektronik (21) aufweist, welche dazu ausgebildet ist, bei vorgebbarer Ansteuerung durch die netzspannungsabhängige Auslöseelektronik (7) einen Schalter (8) anzusteuern, und dass der Schalter (8) im angesteuerten Zustand den Kontakt der Sekundärwicklung (4) zur netzspannungsunabhängigen Auslöseelektronik (5) unterbricht und den Kontakt der Tertiärwicklung (6) zur netzspannungsabhängigen Auslöseelektronik (7) herstellt.
Abstract:
A circuit breaker is disclosed that has a neutral lock-out mechanism that prevents electrical connection between a power source and a load when a neutral rail is disconnected from the circuit breaker. The circuit breaker has a line connector, a load connector and a plug-on neutral line connector. A trip mechanism has an on position allowing electrical connection between the line connector and the load connector. The trip mechanism has a tripped position interrupting electrical connection between the line connector and the load connector in response to detection of a fault condition such as a short circuit. The trip mechanism also has an off position which is required before resetting the trip mechanism to the on position. A trip link is coupled to the trip mechanism. The trip link has a first position that prevents the trip mechanism from being reset to the on position. The trip link has a second position allowing the trip mechanism to be reset to the on position. A neutral lock mechanism is coupled to the plug-on neutral line connector. The neutral lock mechanism has a tension spring that retains the trip link in the first position when the neutral rail is disconnected from the neutral line connector. When the neutral rail is inserted into the neutral line connector, the tension spring is compressed and the trip link may move to the second position allowing the circuit breaker to be reset.
Abstract:
The present invention relates to an Earth Leakage Circuit Breaker (ELCB) used as an electric switch for an electrical circuit which employs a double breakage method of determining whether leakage occurs based on total leakage voltage of a total leakage current detected by a zero-phase current transformer 20 and automatically cutting off the supply of power from a power supply, and determining whether leakage occurs based on the net leakage voltage of a net leakage current synchronously detected by a synchronous detector 90 and automatically cutting off the supply of power from the power supply, so that there are advantages in that the rate of incidence of malfunction of the ELCB is reduced and the leakage breaking function of the ELCB is ef¬ fectively improved, thereby considerably improving safety.