hager electrical components, German hager models, hager prices

hager electrical components are sensor resistors whose resistance changes with temperature. Based on different temperature coefficients, they are classified into positive temperature coefficient (PTC) thermistors and negative temperature coefficient (NTC) thermistors. The resistance of PTC thermistors increases as temperature rises, while the resistance of NTC thermistors decreases as temperature rises; both belong to semiconductor devices.

hager electrical component classification

Classification by application: toggle switches, band switches, record/playback switches, power switches, selector switches, limit switches, control switches, changeover switches, isolator switches, travel switches, wall switches, smart fire protection switches, etc. Classification by structure: micro switches, rocker switches, toggle switches, slide switches, pushbutton switches, key switches, as well as fashionable membrane switches and dot switches. Classification by contact type: Switches can be divided into a contact type, b contact type, and c contact type. Contact type refers to "after operating (pressing) the switch, the contacts close"—the relationship between this operating condition and the contact state. It is necessary to select switches with suitable contact types according to the application. Classification by number of switches: single-control switch, two-way switch, multi-control switch, dimmer switch, speed control switch, splash-proof box, doorbell switch, sensor switch, touch switch, remote control switch, smart switch, card-operated power switch, dedicated switch for bathroom heater.

hager electrical component functions

When the distance between an observer or system and a wave source changes, the frequency of the approaching waves shifts; this phenomenon is known as the Doppler effect. Sonar and radar are developed based on this principle. The Doppler effect is utilized to manufacture ultrasonic proximity switches, microwave proximity switches, etc. When an object approaches, the reflected signal received by the proximity switch undergoes a Doppler frequency shift, allowing identification of the presence of an approaching object. Proximity switches are widely used in aviation, aerospace technology, and industrial production. In daily life, they are applied in automatic doors at hotels, restaurants, and garages, as well as in automatic hot air blowers. For security and anti-theft purposes, important locations such as archives, accounting departments, financial institutions, museums, and vaults are typically equipped with anti-theft devices composed of various proximity switches. In measurement technology, such as for length and position; and in control technology, such as for the measurement and control of displacement, speed, and acceleration, large quantities of proximity switches are also used.

hager electrical component applications

Thermistors can also serve as electronic circuit components for temperature compensation in instrument circuits and cold-junction temperature compensation for thermocouples. Utilizing the self-heating characteristics of NTC thermistors enables automatic gain control, forming RC oscillator amplitude-stabilization circuits, delay circuits, and protection circuits. When the self-heating temperature is significantly higher than the ambient temperature, the resistance is also related to the heat dissipation conditions of the environment; therefore, this characteristic of thermistors is often utilized in flow meters, gas analyzers, and thermal conductivity analysis to create specialized detection elements. PTC thermistors are mainly used for overheat protection of electrical equipment, contactless relays, constant temperature control, automatic gain control, motor starting, time delay, automatic degaussing of color televisions, fire alarms, and temperature compensation. Main disadvantages: (1) severe nonlinearity in the relationship between resistance and temperature; (2) poor consistency and interchangeability of components; (3) components are prone to aging and have relatively poor stability; (4) except for special high-temperature thermistors, most thermistors are only suitable for the range of 0 to 150 °C, which must be noted during use.

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