WALRAVEN electrical components Germany WALRAVEN model WALRAVEN price

WALRAVEN electrical components are Zener diodes manufactured by utilizing the reverse breakdown state of a PN junction, a phenomenon where the current can vary over a wide range while the voltage remains essentially constant. This diode is a semiconductor device with very high resistance up to the critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance drops to a very low value; in this low-resistance region, the current increases while the voltage remains constant. Zener diodes are graded according to their breakdown voltage. Due to this characteristic, Zener diodes are primarily used as voltage regulators or voltage reference elements. Zener diodes can be connected in series for use at higher voltages, allowing higher stable voltages to be obtained through series connection.

WALRAVEN electrical component principle

The absorption film irradiated by infrared rays is a thin film with low heat capacity and easy temperature rise. A cavity structure is located directly below the center of the substrate, ensuring a temperature difference between the cold end and the measuring end. The thermocouple consists of polysilicon and aluminum, connected in series. When the temperature at the measuring end of each thermocouple rises, a thermoelectromotive force Vn is generated between the thermocouples, so the sum of their voltages can be obtained at the output terminal.

WALRAVEN electrical component parameters

(1) Rated operating voltage: refers to the voltage required by the coil for the relay to operate normally. Depending on the relay model, it can be AC voltage or DC voltage. (2) DC resistance: refers to the DC resistance of the relay coil, which can be measured with a multimeter. (3) Pull-in current: refers to the minimum current required for the relay to perform the pull-in action. During normal use, the supplied current must be slightly greater than the pull-in current to ensure stable operation of the relay. The operating voltage applied to the coil should generally not exceed the rated operating voltage; otherwise, excessive current may burn out the coil. (4) Release current: refers to the maximum current at which the relay performs the release action. When the current in the pulled-in state of the relay decreases to a certain level, the relay returns to the de-energized released state; at this time, the current is much lower than the pull-in current. (5) Contact switching voltage and current: refer to the voltage and current that the relay is allowed to carry. These values determine the magnitude of voltage and current the relay can control. Do not exceed these values during use, as doing so may easily damage the relay contacts.

WALRAVEN 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. The upper cap of the fuse element in a screw-type fuse has a fuse indicator; once the fuse element melts, the indicator pops out immediately and can be observed through the glass hole on the ceramic cap. It is often used in machine tool electrical control equipment. Screw-type fuses. Enclosed fuses are divided into filled fuses and unfilled fuses. Filled fuses generally use square ceramic tubes containing quartz sand and the fuse element, offering strong breaking capacity. Unfilled enclosed fuses enclose the fuse 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 fuse element material and shape differ; it uses a variable cross-section fuse element stamped from silver sheets with V shaped deep grooves. Fast-acting fuses are commonly referred to as "fast fuses" and are characterized by fast fusing speed, high rated current, strong breaking capacity, stable current-limiting characteristics, and small size. Self-resetting fuses use sodium metal as the fuse 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 presents a high-resistance state, thereby limiting the short-circuit current. After the short-circuit current disappears and the temperature drops, the sodium metal restores its original good conductivity. Self-resetting fuses can only limit short-circuit current and cannot truly interrupt the circuit. Their advantage is that the fuse element does not need to be replaced, allowing repeated use.

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