SABTRAFO electrical components Germany SABTRAFO model SABTRAFO price

SABTRAFO electrical components are semiconductor transistors, also known as bipolar junction transistors or crystal triodes, which are semiconductor devices that control current. Their function is to amplify weak signals into electrical signals with larger amplitudes, and they are also used as contactless switches. Transistors are one of the basic semiconductor components, featuring current amplification capabilities, and are core components in electronic circuits. A transistor is formed by fabricating two closely spaced PN junctions on a single semiconductor substrate; these two PN junctions divide the entire semiconductor into three parts: the middle part is the base region, and the two sides are the emitter region and the collector region. The arrangement types include PNP and NPN.

SABTRAFO electrical component structure

A solid-state relay consists of three parts: the input circuit, isolation, and output circuit. Depending on the input voltage category, the input circuit can be divided into DC input circuits, AC input circuits, and AC/DC input circuits. Some input control circuits are compatible with TTL/CMOS, offering features such as positive/negative logic control and inversion, allowing easy connection to TTL and MOS logic circuits. For control signals with fixed control voltage, resistive input circuits are used. The isolation and coupling methods between the input and output circuits of solid-state relays include optocoupling and transformer coupling: optocoupling typically uses photodiode-phototransistor pairs, photodiode-bidirectional light-controlled thyristors, or photovoltaic cells to achieve isolated control between the control side and the load side; high-frequency transformer coupling utilizes self-excited high-frequency signals generated by the input control signal, coupled to the secondary side, then demodulated, rectified, and processed by logic circuits to form drive signals. The power switch of the solid-state relay is directly connected to the power supply and load terminals to switch the load power on and off. Mainly used components include high-power transistors, unidirectional thyristors, bidirectional thyristors, power field-effect transistors, and insulated-gate bipolar transistors. The output circuit of a solid-state relay can also be divided into DC output circuits, AC output circuits, and AC/DC output circuits. Based on load type, they can be classified into DC solid-state relays and AC solid-state relays. For DC output, bipolar devices or power field-effect transistors can be used; for AC output, two thyristors or one bidirectional thyristor are typically used. AC solid-state relays can be further divided into single-phase AC solid-state relays and three-phase AC solid-state relays. AC solid-state relays can be classified into random-turn-on AC solid-state relays and zero-crossing AC solid-state relays based on the timing of turn-on and turn-off.

SABTRAFO electrical component classification

Light-emitting diodes can be further divided into ordinary monochrome LEDs, high-brightness LEDs, ultra-high-brightness LEDs, color-changing LEDs, flashing LEDs, voltage-controlled LEDs, infrared LEDs, and negative-resistance LEDs. The control modes for LED include constant current and constant voltage, with various dimming methods such as analog dimming and PWM dimming. Most LED units adopt constant current control to maintain stable LED current, making them less susceptible to changes in VF, thereby extending the service life of LED lighting fixtures.

SABTRAFO electrical component structure

For rubber and plastic power cable conductors used for power, lighting, and internal installation of electrical equipment, copper cores are preferred; for large cross-section wires, compacted stranded cores are recommended. Conductors for fixed installations generally use Class 1 or Class 2 conductor structures. Insulation materials generally include natural styrene-butadiene rubber, polyvinyl chloride (PVC), polyethylene, and nitrile-PVC compounds. Heat-resistant power cables use PVC rated for 90 °C. Sheath materials generally include PVC, cold-resistant PVC, ant-termite PVC, black polyethylene, and neoprene rubber. Black polyethylene and neoprene sheathed power cables are suitable for extreme cold resistance and outdoor overhead installation. In environments with external forces, corrosion, or humidity, rubber or plastic sheathed power cables can be used. Rubber and plastic flexible power cables use copper cores with a flexible structure, composed of multiple single wires twisted together; flexible conductors generally use Class 5 or Class 6 conductor structures. Insulation materials generally include natural styrene-butadiene rubber, PVC, or soft polyethylene plastic. The cabling lay ratio multiplier is small. The outer protective layer uses cotton yarn braiding to prevent overheating and damage to the insulation layer. To facilitate use and simplify production processes, a three-core balanced structure is adopted, saving production labor hours and improving efficiency. Shielded insulated power cable conductors may be tin-plated in certain applications; the surface coverage density of the shielding layer must comply with standards or meet user requirements; the shielding layer should be braided or wrapped with tinned copper wire; if an extruded sheath is added over the shield, the shield may use soft round copper wire braiding or wrapping. To prevent internal interference between cores or pairs, individual phase shielding structures for each core (or pair) can be produced. General-purpose rubber-sheathed rubber power cable conductors use twisted copper flexible bundles with a flexible structure; large cross-section surfaces may be paper-wrapped to improve bending performance. Insulation uses natural styrene-butadiene rubber, which has good aging resistance. Outdoor product rubber uses neoprene or neoprene-based mixed rubber formulations. Mining rubber power cable conductors use copper cores with a flexible structure, composed of multiple single wires twisted together; flexible conductors generally use Class 5 or Class 11 conductor structures. Insulation materials generally use rubber. The cabling lay ratio multiplier is small. Many products use metal braiding to uniform the electric field and improve insulation status sensitivity display. They have thicker outer sheaths and are color-coded underground in mines to help construction personnel understand the different voltage levels of the rubber power cables.

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