Dart Controls 150 Series DC motor speed controls are designed to regulate the speed of DC (direct current) motors. These units feature adjustable parameters (maximum / minimum speed, acceleration rate and current limit) to customise the motor's speed and performance as per application needs. They feature NEMA 4X enclosures to withstand dust, dirt, water and corrosion. These devices also include additional features like line voltage compensation to maintain consistent performance despite fluctuations in input line voltage and a speed potentiometer with a dial knob to adjust resistance up to 5000 ohms for smoother speed control. They offer surge protection to safeguard motors and speed controls from voltage transients or surges.