Products

RST Electric presents Open Air Current Sensing Resistor – a high-precision, low-ohmic resistor engineered for accurate current measurement in space-constrained applications. Featuring a metal alloy element with an open-air vertical construction, this Current Sensing Resistor delivers extremely low resistance (from 5mΩ to 100mΩ), minimal inductance, and excellent thermal dissipation. With power ratings of 1W, 3W, and 5W, and tolerances as tight as ±1%, it is ideal for inverter circuits, power supplies, motor controls, and battery management systems. The radial lead design elevates the element above the PCB, maximizing airflow and keeping heat away from sensitive board components. Available in constantan or nichrome materials with a low temperature coefficient (40 ppm/°C), this Metal Element Resistor ensures stable, repeatable performance across a wide operating range. 

RST Electric presents the Metal Alloy Current Sense Resistor – a high-precision, ultra-low-ohm resistor engineered for accurate current measurement in space-constrained power circuits. Featuring a metal alloy element with a vertical radial-lead package, this Current Sense Resistor delivers extremely low resistance values (from 2mΩ to 50mΩ), minimal inductance, and outstanding thermal stability. With current ratings from 2.5A to 21A and tight tolerances as low as ±1%, it is ideal for battery management systems (BMS), motor controls, power supplies, and inverter circuits. The low temperature coefficient (down to ±50 ppm/°C) ensures stable performance across a wide operating temperature range (-55°C to +85°C), while the compact vertical footprint saves valuable PCB real estate.

RST Electric presents the Current Sensing Resistor – a precision, ultra-low-ohm resistor engineered for accurate current measurement in compact electronic systems. Featuring a metal alloy element in a thin vertical package, this Metal Element Resistor delivers extremely low resistance values (from 3mΩ to 100mΩ) with a low temperature coefficient (as low as ±50 ppm/°C) and minimal inductance. Available in 1W, 2W, and 3W power ratings, it is ideal for battery-powered devices, portable instrumentation, power management ICs, and low-power motor controls. The slim profile (4.5mm body height) and flexible lead spacing (10mm–25mm) allow easy integration into space-constrained PCB layouts, while tight tolerances (down to ±1%) ensure measurement accuracy. 

RST Electric presents Low Resistance Shunt – a precision, high-current current sensing solution designed for demanding automotive, industrial, and renewable energy applications. Utilizing vacuum electron beam welding technology with pure copper electrodes, this Current Shunt delivers exceptional stability, high pulse withstand capability, and ultra-low resistance values from 0.1mΩ to 0.667mΩ. With power ratings up to 15W and tolerances as tight as ±0.5%, it is ideal for battery management systems (BMS), motor drives, inverters, and high-frequency power conversion. The all-metal construction features a pickled and passivated surface for superior corrosion resistance and weatherability, while ultra-low inductance (<5nH) and minimal thermal EMF ensure accurate measurement in fast-switching circuits. Fully compliant with RoHS and Reach, this High Precision Shunt is available in multiple form factors with custom specifications supported. 

RST Electric presents Bare Alloy Current Sense Resistor – a high-precision, surface-mount shunt resistor engineered for ultra-low resistance current sensing in demanding power electronics. Featuring an electron beam welded alloy element with pure copper electrodes, this SMD Current Sense Resistor delivers exceptionally low resistance values (from 0.1mΩ to 5mΩ), ultra-low parasitic inductance (0.5nH to 5nH), and minimal thermoelectric EMF (<1µV/°C). Available in 3W, 5W, and 7W power ratings with industry-standard footprints (2512, 3920, 5930, 2726), it is ideal for automotive battery management systems (BMS), high-frequency switching converters, and motor control applications. Tight tolerances down to ±0.5% and low TCR (as low as ±100 ppm/°C) ensure accurate current measurement across a wide temperature range.

RST Electric presents 12V Blower Motor Resistor – a dedicated speed control resistor designed for automotive HVAC (heating, ventilation, and air conditioning) systems. Engineered specifically for 12V vehicle electrical systems, this Blower Motor Resistor delivers reliable fan speed regulation with a built-in 240°C thermal fuse for over-temperature protection. With a power rating of 50W and resistance of 0.15Ω (±10%), it is optimized for low-speed fan operation in passenger cars, commercial vehicles, and off-highway equipment. The unit comes pre-wired with 1.5–2.5mm² leads (150–300mm length) for direct plug-and-play installation, simplifying replacement and assembly. Housed in a flame-retardant, weather-resistant package, it withstands harsh under-dash environments, including temperature extremes, vibration, and humidity.