Products

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. 

RST Electric presents 24V Blower Motor Resistor – a heavy-duty speed control resistor engineered for commercial vehicle cooling fan systems. Designed specifically for 24V electrical architectures found in trucks, buses, agricultural machinery, and construction equipment, this Cooling Fan 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 0.30Ω (±10%), it is optimized for low-speed fan operation in high-ambient-temperature environments. The unit comes pre-wired with 1.5–2.5mm² leads (150–300mm length) for direct installation, minimizing downtime during replacement. Housed in a flame-retardant, weather-resistant package, it withstands extreme vibration, temperature cycling (-55°C to +155°C), and high humidity conditions common in off-highway applications.

RST Electric presents TO220 Thick Film Power Resistor – a compact, high-performance resistor designed for power electronics requiring efficient thermal management and easy assembly. Housed in a standard TO220 plastic package with a metal mounting tab, this TO220 Power Resistor delivers 35W (PRT35) or 50W (PRT50) at 25°C case temperature when properly heatsink mounted. With a wide resistance range from 0.1Ω to 1MΩ and tolerances as tight as ±0.5%, it is ideal for switching power supplies, snubber circuits, power amplifiers, and voltage regulation applications. The molded plastic case provides high insulation resistance (>10GΩ) and withstands 1800VAC dielectric strength, while the non-inductive thick film construction ensures stable performance in high-frequency circuits.

RST Electric introduces TO247 Thick Film Power Resistor – a high-power, surface-mountable resistor designed for demanding power electronics requiring superior thermal management. Housed in a standard TO247 plastic package with an integral mounting tab, this TO247 Power Resistor delivers 100W at 25°C case temperature when properly heatsink mounted, making it ideal for high-power switching supplies, pulse loading circuits, power amplifiers, and snubber networks. With a wide resistance range from 0.2Ω to 1MΩ, tolerances as tight as ±1%, and a maximum working voltage of 700V, it offers exceptional versatility for industrial, automotive, and renewable energy applications. The molded plastic case provides high insulation resistance (>10GΩ) and withstands 1800VAC dielectric strength, while the non-inductive thick film construction ensures stable performance in high-frequency circuits.