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 thermistors and negative temperature coefficient thermistors. The resistance of positive temperature coefficient thermistors increases as temperature rises, while the resistance of negative temperature coefficient 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, isolating switches, travel switches, wall switches, smart fire protection switches, etc. Classification by structure: micro switches, rocker switches, toggle switches, slide switches, push-button switches, key switches, as well as fashionable membrane switches and dot switches. Classification by contact type: switches can be divided into a type contacts, b type contacts, and c type contacts. Contact type refers to the relationship between the operating condition (contacts close when the switch is pressed) and the contact state. Suitable contact types must be selected according to the application. Classification by number of switches: single-control switches, dual-control switches, multi-control switches, dimmer switches, speed control switches, splash-proof boxes, doorbell switches, proximity switches, touch switches, remote control switches, smart switches, card-insertion power switches, bathroom heater dedicated switches.

hager electrical component functions

When the distance between the observer or system and the wave source changes, the frequency of the approaching waves shifts; this phenomenon is called the Doppler effect. Sonar and radar are developed based on this principle. The Doppler effect can be used to create 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 whether an object is approaching. Proximity switches are widely used in aviation, aerospace technology, and industrial production. In daily life, they are applied in automatic doors in 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 length and position measurement, and in control technology, such as displacement, velocity, and acceleration measurement and control, a large number 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 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 TVs, 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 0–150°C range, which must be noted during use.

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