Siemens Aktiengesellschaft

Esteban Sandoval Camacho

Stephen Scott Thomas

Jorg Sizemore

A magnetic trip device of a thermal magnetic circuit breaker and a thermal magnetic circuit breaker including such a magnetic trip device, and also a method for adjusting a magnetic field area of a magnetic trip device of a thermal magnetic circuit breaker, are disclosed. In at least one embodiment, the magnetic trip device includes at least an armature locator moveable arranged at a pin in order to adjust a magnetic field area, and an armature element fixed on a lower surface of the armature locator in order to interact with a yoke, arranged near a current conductive element for conducting electric energy. The armature locator includes an adjustment element arranged between a spring element and the yoke. The spring element surrounding at least a part of the pin is arranged between the armature element and the yoke.

Magnetic trip device of a thermal magnetic circuit breaker having an adjustment element

A magnetic trip device of a thermal magnetic circuit breaker, a thermal magnetic circuit breaker that includes such a magnetic trip device, and a method for adjusting a magnetic field area of a magnetic trip device of a thermal magnetic circuit breaker, are disclosed. In an embodiment, the magnetic trip device includes at least an armature locator moveable arranged on a pin in order to adjust a magnetic field area, and an armature element fixed on a lower surface of the armature locator in order to interact with a yoke. The armature locator includes a stabilizer element in order to increase a contact area between the pin and the armature locator and/or a recess in order to receive at least an upper end of a spring element in order to space the armature element and the yoke from each other at least partially.

Magnetic trip device of a thermal magnetic circuit breaker having a stabilizer element

A thermal-magnetic trip unit is provided for a circuit breaker. The thermal-magnetic trip unit includes a heater and a translational magnetic system coupled to the heater. The heater includes a first portion, a second portion, and a third disposed between the first portion and the second portion. The first portion has a first surface disposed in a first plane, and the second portion has a second surface disposed in a second plane that is substantially parallel to the first plane. The first surface is separated by a first predetermined distance from the second surface. The third portion has a third surface disposed in a third plane that is substantially perpendicular to the first plane. The third surface has a first predetermined length and is separated by a second predetermined distance from the second surface. Numerous other aspects are provided.

Circuit breaker heaters and translational magnetic systems

Methods, apparatus, and systems are provided for calibrating a thermomagnetic trip unit in a circuit breaker base assembly. An apparatus for calibrating a trip unit includes a calibration nut, an extended armature guide pin having a threaded portion, a spring disposed on the calibration nut and coiled around the extended armature guide pin, and an armature disposed on the spring and adapted to be held by an electromagnet. The calibration nut is threaded on the threaded portion of the extended armature guide pin and adapted to translate up or down depending on rotation of the extended armature guide pin to compress or decompress the spring against the armature. The extended armature guide pin includes a slotted end that is accessible when the apparatus is installed in the circuit breaker base assembly. The calibration nut is also accessible when the apparatus is installed in the circuit breaker base assembly.

Methods and apparatus for calibrating a thermomagnetic trip unit of a circuit breaker

A trip unit is provided for a circuit breaker that includes electrical contacts, a trip mechanism, a bimetallic strip, and an armature. The trip unit includes a first trip bar coupled to the trip mechanism and disposed about a pivot point, and a second trip bar coupled to the first trip bar and disposed about the pivot point. In a first operating condition, the first trip bar rotates about the pivot point substantially independently of the second trip bar, and activates the trip mechanism to open the electrical contacts. In a second operating condition, the second trip bar rotates about the pivot point, causing the first trip bar to rotate about the pivot point and activate the trip mechanism to open the electrical contacts. Numerous other aspects are provided.

Growing community of inventors

Monterrey, Mexico

Esteban Sandoval Camacho