CB39 AC Motor Speed Control Board 230V 50-500W

WHY THIS BOARD

Why choose CB39

The CB39 AC Motor Speed Control Board is designed for variable speed control of medium-power AC motor applications.

Supporting AC230V input voltage and 50-500W power range, CB39 provides smooth speed adjustment and reliable motor control performance for electric tools, small machinery, and OEM equipment.

With a compact PCB structure and flexible integration design, CB39 helps manufacturers develop efficient motor-driven products with adjustable speed functions.

AC speed regulation

Continuous motor speed control from the rotary dial — adjust cutting and sanding speed to the material.

Soft start

Gradually ramps up motor power at startup — eliminates jarring impact and extends motor and mechanical life.

Constant power compensation

Automatically compensates for load changes to maintain consistent cutting performance.

SPECIFICATIONS

CB39

Specification	Value
Model	CB39
Standard	—
Rated voltage	AC 230V
Rated current	—
Rated power	50~800W
Function	AC Speed Regulation · Soft Start · Constant Power Compensation

PRODUCT VIEW

CB39 at a Glance

Board dimensions, dial and wiring from the catalog drawing.

BOARD

CB39 AC speed control board with soft start and constant power compensation — 50~800W.

WIRING

Red, black and white leads for speed control and motor connection — wired to AC 230V.

USE

Fits AC-powered power tools with soft start requirement — wire between the trigger switch and the motor to reduce startup current.

APPLICATIONS

For AC-powered power tools

Official application range of the speed control board series.

01

AC-powered jigsaws

02

Circular saws

03

Reciprocating saws

04

Small bench drills

05

Table saws

06

Other handheld electric tools

TECHNICAL DRAWING

CB39 Dimensions & Wiring

Official engineering drawing from the catalog — click to enlarge.

PCB: 37 × 45.4 mm  ·  Thickness: 1.5 mm  ·  Knob: Φ30.5 mm  ·  Knob H: 13 mm  ·  Height: 27 mm  ·  Mounting: 2-Φ3.5

Wiring: Blue (18AWG) — Neutral input | Brown (18AWG) — Live input

Strip 5mm from wire end for terminal connection.

QUALITY & CERTIFICATIONS

Approved for global markets, checked at four gates

CB39 is built in our ISO 9001:2015 plant with UL- and TÜV-certified in-house laboratories, and every unit passes four quality gates before it ships.

TÜVcULusCEISO 9001:2015

IQC

Incoming quality control — materials and components are inspected on arrival.

IPQC

In-process quality control — automated assembly lines are checked at every station.

FQC

Final quality control — every unit is tested before shipment.

OQC

Outgoing quality control — packed batches are re-checked before dispatch.

Need a Custom Motor Control Solution?

Our engineering team can tailor a speed control PCB to your exact specifications. Get in touch for samples and pricing.

Contact Us

Frequently Asked Questions

What is the CB39?

The CB39 AC Motor Speed Control Board is designed for variable speed control of medium-power AC motor applications.

What are the key specifications of the CB39?

Model: CB39; Rated voltage: AC 230V; Rated power: 50~800W; Function: AC Speed Regulation · Soft Start · Constant Power Compensation.

What should be checked before using the CB39 as a replacement?

Before using this product as a replacement, verify that rated voltage (AC 230V), rated power (50~800W) match your target part. Also check the mounting and terminal layout. Contact DKLD with the ratings of the part you are replacing and we will confirm suitability.

Can this product range be customized for OEM projects?

Yes. Electrical parameters, connectors and packaging can be customized for OEM/ODM projects.

How can I verify DKLD certifications?

UL certification and TÜV certification are verifiable in the official databases.

Where are DKLD products manufactured?

All products are manufactured at our Yueqing facility with in-house quality control.