Bircher electrical components Germany Bircher model Bircher price

Bircher electrical components are fuses that can operate multiple times, known in Japan as permanent fuses. Immediately after interrupting an overload or short-circuit current, the fusible element automatically restores to its original state. The housing is made of austenitic stainless steel, with a beryllium oxide ceramic core embedded in the center. The space between the stainless steel and the ceramic core is filled with glass to seal and secure the core. Metallic sodium is injected into the fine pores of the ceramic core as the fusible element, and the void behind the piston is filled with argon gas to compress the metallic sodium. Under normal operating conditions, current enters from lead terminal A, passes through the metallic sodium in the fine pores of the ceramic core, conducts to the stainless steel housing, and exits via output terminal B. When a short-circuit current passes through the fuse, it rapidly heats the metallic sodium in the fine pores of the ceramic core, causing it to change from a solid to a high-temperature, high-pressure plasma vapor. The resistivity increases rapidly, thereby strongly limiting the short-circuit current and interrupting it instantly. When the interruption is complete, the sodium vapor immediately returns to liquid and solid states, while the argon gas again pushes the piston to compress the metallic sodium, re-establishing the circuit connection.

Bircher electrical component classification

Plug-in fuses are often used at the end of lines for short-circuit protection of distribution branch circuits or electrical equipment. Screw-type fuses have a fuse indicator on the upper cap of the fusible element; once the element blows, the indicator pops out immediately and can be observed through the glass hole on the ceramic cap. They are commonly used in machine tool electrical control equipment. Screw-type fuses. Enclosed fuses are divided into filled and unfilled types. Filled fuses generally use square ceramic tubes containing quartz sand and the fusible element, offering high breaking capacity. Unfilled enclosed fuses enclose the fusible element in a sealed cylinder, with slightly lower breaking capacity. Fast-acting fuses are mainly used for short-circuit protection of semiconductor rectifier elements or rectifier devices. Since semiconductor components have very low overload capacity and can only withstand large overload currents for extremely short periods, short-circuit protection requires fast-acting fusing capability. The structure of fast-acting fuses is basically the same as that of filled enclosed fuses, but the material and shape of the fusible element differ; it is a variable-cross-section element stamped from silver sheets with V shaped deep grooves. Fast-acting fuses, often abbreviated as "fast fuses," are characterized by fast fusing speed, high rated current, strong breaking capacity, stable current-limiting characteristics, and small size. Self-restoring fuses use metallic sodium as the fusible element, which has high electrical conductivity at room temperature. When a short-circuit fault occurs in the circuit, the short-circuit current generates high temperature, causing the sodium to vaporize rapidly. The gaseous sodium exhibits a high-resistance state, thereby limiting the short-circuit current. After the short-circuit current disappears and the temperature drops, the metallic sodium restores its original good conductivity. Self-restoring fuses can only limit short-circuit current and cannot truly interrupt the circuit. Their advantage is that the fusible element does not need to be replaced, allowing repeated use.

Bircher electrical component functions

Functions of capacitors: 1. Capacitors used in coupling circuits are called coupling capacitors. This type of capacitor circuit is widely used in RC-coupled amplifiers and other capacitor-coupled circuits to block DC and pass AC. 2. Capacitors used in filtering circuits are called filter capacitors. This type of capacitor circuit is used in power supply filters and various filter circuits; filter capacitors remove signals within a certain frequency band from the total signal. 2. Capacitors used in decoupling circuits are called decoupling capacitors. This type of capacitor circuit is used in the DC voltage supply circuits of multi-stage amplifiers to eliminate harmful low-frequency coupling between amplifier stages. 3. Capacitors used in high-frequency oscillation suppression circuits are called high-frequency suppression capacitors. In audio negative feedback amplifiers, this type of capacitor circuit is used to suppress potential high-frequency self-excitation and eliminate possible high-frequency whistling in the amplifier. 4. Capacitors used in LC resonant circuits are called resonant capacitors. This type of capacitor circuit is required in both LC parallel and series resonant circuits. 5. Capacitors used in bypass circuits are called bypass capacitors. If a specific frequency band needs to be removed from a signal in a circuit, a bypass capacitor circuit can be used. Depending on the frequency of the signal to be removed, there are full-frequency (all AC signals) bypass capacitor circuits and high-frequency bypass capacitor circuits. 6. Capacitors used in neutralization circuits are called neutralization capacitors. This type of neutralization capacitor circuit is used in radio frequency and intermediate frequency amplifiers in radios, and in high-frequency amplifiers in televisions, to eliminate self-excitation. 7. Capacitors used in timing circuits are called timing capacitors. Timing capacitor circuits are used in circuits where time control is achieved through capacitor charging and discharging; the capacitor controls the magnitude of the time constant. 8. Capacitors used in integration circuits are called integrating capacitors. This type of integrating capacitor circuit is used in the synchronization separation circuit for potential field scanning to extract the field synchronization signal from the field composite synchronization signal. 9. Capacitors used in differentiation circuits are called differentiating capacitors. This type of differentiating capacitor circuit is used in trigger circuits to obtain sharp-triggered signals, extracting sharp pulse trigger signals from various (mainly rectangular pulse) signals. 10. Capacitors used in compensation circuits are called compensation capacitors. This type of low-frequency compensation capacitor circuit is used in the bass compensation circuit of cassette decks to enhance low-frequency signals in the playback audio; there are also high-frequency compensation capacitor circuits. 11. Capacitors used in bootstrap circuits are called bootstrap capacitors. Commonly used OTL power amplifier output stage circuits employ this type of bootstrap capacitor circuit to slightly increase the amplitude of the positive half-cycle of the signal through positive feedback. 12. Capacitors used in crossover circuits are called crossover capacitors. Crossover capacitor circuits are used in speaker crossover networks in loudspeakers to ensure that high-frequency speakers operate in the high-frequency band, mid-range speakers in the mid-frequency band, and low-frequency speakers in the low-frequency band. 13. Refers to the effective external capacitance that, together with the quartz crystal resonator, determines the load resonant frequency. Common standard values for load capacitance are 16pF, 20pF, 30pF, 50pF, and 103pF. Load capacitance can be appropriately adjusted according to specific conditions; generally, adjusting it allows tuning the resonator's operating frequency to the nominal value.

Bircher electrical component characteristics

Dynamic characteristics refer to the output behavior of a sensor when the input changes. In practical applications, the dynamic characteristics of sensors are often represented by their response to certain standard input signals. This is because the response to standard input signals can be easily determined experimentally, and there is a certain relationship between the response to standard input signals and the response to arbitrary input signals; knowing the former often allows inference of the latter. The most common standard input signals are step signals and sinusoidal signals, so the dynamic characteristics of sensors are also commonly expressed by step response and frequency response.

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