ott electrical components German ott models ott prices

ott electrical components are current-limiting elements. When a resistor is connected in a circuit, its resistance is fixed, typically with two pins, and it limits the current flowing through the branch to which it is connected. Resistors with unchangeable resistance are called fixed resistors. Those with variable resistance are called potentiometers or variable resistors. An ideal resistor is linear, meaning the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Variable resistors used for voltage division. On the exposed resistive body, one or two movable metal contacts are pressed firmly. The position of the contacts determines the resistance between either end of the resistive body and the contact. The terminal voltage and current have a definite functional relationship. It is a two-terminal device that embodies the ability to convert electrical energy into other forms, represented by the letter R, with the unit ohm Ω. Actual devices such as light bulbs, heating wires, and resistors can all be represented as resistor components. The resistance value of a resistive element is generally related to temperature, material, length, and cross-sectional area. The physical quantity measuring the extent to which resistance is affected by temperature is the temperature coefficient, defined as the percentage change in resistance when the temperature increases by 1 ℃. The main physical characteristic of a resistor is converting electrical energy into thermal energy; it can also be described as a dissipative element, generating internal energy when current passes through it. Resistors typically serve voltage division and current shunting functions in circuits. For signals, both AC and DC signals can pass through resistors.

ott electrical component composition

Internal accessories of circuit breakers: Auxiliary contacts are mechanically linked to the opening and closing mechanism of the circuit breaker's main circuit. They are mainly used to display the open/closed status of the circuit breaker. Connected in the control circuit of the circuit breaker, they implement control or interlocking of related electrical appliances through the opening and closing of the circuit breaker. Alarm contacts are used for accident alarms in circuit breakers. These contacts only act after the circuit breaker trips and opens. They are mainly used when the load on the circuit breaker experiences faults such as overload, short circuit, or undervoltage, causing free tripping. The alarm contact switches from its normally open position to a closed position, connecting indicator lights, electric bells, buzzers, etc., in the auxiliary circuit to display or remind of the circuit breaker's fault trip status. Since the probability of free tripping due to load faults is not high. Shunt release: A shunt release is a release excited by a voltage source, and its voltage is independent of the main circuit voltage. A shunt release is an accessory for remote operation of opening. When the power supply voltage is any voltage between 70% and 110% of the rated control power supply voltage, the circuit breaker can reliably open. The shunt release operates on a short-time duty cycle; the coil energization time generally must not exceed 6S, otherwise the coil will burn out. To prevent coil burnout in molded case circuit breakers, a micro switch is connected in series with the shunt release coil. When the shunt release pulls in via the armature, the micro switch changes from normally closed to normally open. Since the control circuit for the shunt release power is cut off, even if the button is manually held down, the shunt coil will not be energized again, thus avoiding coil damage. After the circuit breaker is reset and closed, the micro switch returns to the normally closed position. Undervoltage release: An undervoltage release is a release that causes the circuit breaker to open with or without delay when its terminal voltage drops to a specified range. Under thermal conditions, it must ensure reliable closing of the circuit breaker. Therefore, when a certain voltage drop occurs in the power supply voltage of the protected circuit, it can automatically open the circuit breaker to cut off the power, protecting the load appliances or electrical equipment downstream of the circuit breaker from undervoltage damage. During use, the undervoltage release coil is connected to the power side of the circuit breaker. The circuit breaker can only be closed after the undervoltage release is energized.

ott electrical component composition

1. Wiring harnesses are designed to facilitate installation and maintenance, ensuring electrical equipment can operate under the harshest conditions. Wires of different specifications and colors used by various electrical equipment in the entire vehicle are reasonably arranged and combined into a single unit, bundled with insulating material. This makes them both complete and reliable. 2. Normal selection of wire cross-sectional area and color codes: (1) Correct selection of wire cross-sectional area. Electrical equipment in the vehicle selects the wire cross-sectional area based on the magnitude of the load current. For electrical equipment operating for long durations, 60% of the actual current-carrying capacity of the wire can be selected; for electrical equipment operating for short durations, 60%-103% of the actual current-carrying capacity can be used. (2) Selection of wire color codes. To facilitate identification and maintenance, wires in the harness use different colors. For easy labeling in circuit diagrams, wire colors are represented by letters, with the corresponding colors annotated in each circuit diagram.

ott electrical component principles

In power generation, transformation, transmission, distribution, and consumption lines, current magnitudes vary significantly, ranging from a few amperes to tens of thousands of amperes. To facilitate measurement, protection, and control, currents need to be converted to a relatively uniform level. Additionally, voltages on lines are generally high, making direct measurement very dangerous. Current transformers serve the functions of current transformation and electrical isolation. For pointer-type ammeters, the secondary current of current transformers is mostly at the ampere level. For digital instruments, the sampled signal is generally at the milliampere level. The secondary current of miniature current transformers is at the milliampere level, primarily serving as a bridge between large transformers and sampling. Miniature current transformers are also referred to as 'instrument current transformers.' ('Instrument current transformer' implies precision current transformers with multiple current ratios used in laboratories, generally for extending instrument ranges.) Current transformers work on the principle of electromagnetic induction, similar to transformers; however, transformers transform voltage while current transformers transform current. The winding of the current transformer connected to the measured current is called the primary winding; the winding connected to the measuring instrument is called the secondary winding. The ratio of the primary winding current I1 to the secondary winding I9 current is called the actual current ratio K. The current ratio when the current transformer operates at rated current is called the rated current ratio of the current transformer, denoted by Kn.

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