2-6S 30A Bidirectional Self-Starting ESC Speed Controller, Model A/B/C/D

ZMR 2-6S 30A Bidirectional Self-Starting Brushless Speed Controller for DIY Power Tools and Industrial Motors
The ZMR 30A Bidirectional Brushless ESC is a versatile electronic speed controller designed for DIY modification and industrial brushless motor applications. Supporting a wide input voltage range of 7V to 25.2V (2-6S LiPo), it is well-suited for powering brushless systems in water pumps, fans, knife grinders, hand grinders, and electric hand drills. With a maximum continuous current of 30A and peak power output of 500W, this controller delivers reliable performance across a broad range of motor configurations.

Model A – Power-On Auto-Start: Motor starts automatically at full speed when power is applied. No external control input required.
Model B – Dial Switch Start/Stop: Start and stop functions are controlled via a dial switch. Motor runs at full speed once started.
Model C – Rotary Switch Speed Control: Motor start, stop, and speed are all controlled through a single rotary switch, allowing variable speed operation.
Model D – Dial Switch Direction + Knob Speed Control: Speed is adjusted via a knob, while a dial switch controls stop and directional change. Forward and reverse rotation can be switched freely after the motor has started.

Available in four distinct control variants – Model A, B, C, and D – the ZMR 30A ESC offers flexible start, stop, speed, and directional control options to match specific application requirements. Built-in protections against temperature rise, locked-rotor conditions, and overcurrent events ensure safe and stable operation even under demanding loads. For motors drawing up to 20A, this 30A-rated unit provides adequate headroom for extended run cycles. Long-term use requires adequate heat dissipation, with forced air-cooling or water-cooling recommended for sustained high-load operation.
Key Features

Input Voltage Range: Supports 7V to 25.2V (2-6S LiPo battery packs)
Maximum Continuous Current: Rated at 30A with a peak power output of 500W
Four Control Variants: Model A (power-on self-start), Model B (dial switch start/stop), Model C (rotary switch for start, stop, and speed), Model D (dial switch for stop and reverse with separate speed knob)
Bidirectional Motor Control: Model D supports free switching between forward and reverse rotation after start-up
Maximum Speed Support: Up to 224,000 RPM for 2-pole motors, 74,000 RPM for 6-pole motors, 40,000 RPM for 12-pole motors, and 35,000 RPM for 14-pole motors
Temperature Protection: Built-in over-temperature shutdown to prevent damage during prolonged use
Locked-Rotor Protection: Detects and responds to stall conditions to safeguard the motor and controller
Overcurrent Protection: Automatically limits current beyond rated threshold to extend component life
DIY and Industrial Compatible: Designed for brushless power tools, pumps, fans, and grinding applications rather than aircraft use

Applications

Water pumps and fluid circulation systems
Industrial and domestic fans
Knife grinders and bench grinders
Hand grinders and angle grinders
Electric hand drills and rotary tools
DIY brushless motor modification projects
Small-scale industrial brushless drive systems

Note: The product is not intended for RC aircraft or drone applications. Polarity must be observed during wiring reversed connections will damage the controller. For Models A and B which run at full speed on power-up, adequate heat dissipation (forced air or water-cooling) is strongly recommended for sustained operation.