---
product_id: 385210591
title: "Baomain Universal Rotary Changeover Switch SZW26-40/D303.3D with Master Switch Exterior Box 660V 40A 3 Position 12 Terminals 3 Phase"
brand: "baomain"
price: "NT$2829"
currency: TWD
in_stock: true
reviews_count: 11
category: "Baomain"
url: https://www.desertcart.tw/products/385210591-baomain-universal-rotary-changeover-switch-szw26-40-d303-3d-master
store_origin: TW
region: Taiwan
---

# 660V max voltage 3-position rotary action 12 screw terminals Baomain Universal Rotary Changeover Switch SZW26-40/D303.3D with Master Switch Exterior Box 660V 40A 3 Position 12 Terminals 3 Phase

**Brand:** baomain
**Price:** NT$2829
**Availability:** ✅ In Stock

## Summary

> 🔄 Master your power flow with Baomain’s ultimate rotary switch!

## Quick Answers

- **What is this?** Baomain Universal Rotary Changeover Switch SZW26-40/D303.3D with Master Switch Exterior Box 660V 40A 3 Position 12 Terminals 3 Phase by baomain
- **How much does it cost?** NT$2829 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/385210591-baomain-universal-rotary-changeover-switch-szw26-40-d303-3d-master)

## Best For

- baomain enthusiasts

## Why This Product

- Trusted baomain brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Durable brass contacts and IP65-rated enclosure ensure reliable performance in tough environments.
- • **Plug & Play Versatility:** 12 screw terminals accommodate complex wiring, perfect for multi-generator or inverter systems.
- • **Power Up with Confidence:** Handles up to 40A continuous current for robust industrial and home backup setups.
- • **Compact Industrial Design:** Sleek 4.3x4.3x5.3 inch form factor fits neatly in your power control panel without bulk.
- • **Seamless Source Switching:** 3-position ON-OFF-ON rotary switch lets you effortlessly toggle between power inputs.

## Overview

The Baomain SZW26-40/D303.3D is a heavy-duty 3-pole rotary changeover switch designed for seamless manual transfer between multiple power sources. Rated for 660V and 40A, it features 3 selectable positions (ON-OFF-ON) and 12 screw terminals for versatile wiring configurations. Its robust brass contacts and IP65-rated exterior box make it ideal for industrial, emergency backup, and hybrid power systems, delivering reliable, compact, and professional-grade power control.

## Description

Baomain Universal Rotary Changeover Switch SZW26-40/D303.3D with Master Switch Exterior Box 660V 40A 3 Position 12 Terminals 3 Phase: desertcart.com: Industrial & Scientific

Review: Works Perfect - Perfect for manual transfer of shore/inverter power. I was also able to incorporate my converter wiring to bypass it at the same time, so I am not converting while inverting.
Review: Perfect Switch - I purchased this switch to use in my emergency power backup system for our home. I have had a gas powered standby generator for years and wanted to add a solar/battery generator, as well. One generator feeds 240V, 30amp power while the other feeds 120V, 30amp power. I needed a way to connect both generators to an existing transfer switch, but be able to select which power source was feeding the system. This switch was the perfect solution to that need. With three contacts on all sides of the switch, it accommodated the two power legs and neutral from the 240V generator feeding the same on the output side of the switch. The single power leg and neutral from the 120V generator, along with a jumper, provided the other power to the three wire output. Since there were two inputs to the switch going to a single output, three jumpers were also required. Be aware that the knockouts on the switch box are not standard size but are sized for the rubber grommets that come with the box. Consequently, a standard 1/2" or 3/4" cable connector will not work. An optional 2-part cable connector that can be slipped into the knockout holes will be needed. Also, you will have 11 or 12 10ga. solid copper wires coming into this box that will be very hard to compress into the box once your switch is wired. It can be done with special attention to placement of the wires, though, and when place in service, this is a top quality switch.

## Features

- Model : SZW26-40/D303.3D
- Pole Numbers : 3 Pole; Action Type: Locking
- Positions : 3 Positions(1-0-2/ON-OFF-ON),12 Screw Terminals
- Ui : 660V; Ith : 40A; Ue : AC240V/AC440V
- AC-23A le : 30A; AC-3 le : 22A; AC-4 le : 11A

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09994XMDR |
| Actuator Type | Rotary |
| Best Sellers Rank | #37,750 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Selector Switches |
| Brand | Baomain |
| Circuit Type | 3-way |
| Connectivity Protocol | X-10 |
| Connector Type | Screw |
| Contact Material | Brass |
| Contact Type | No Nc |
| Control Method | Touch |
| Control Type | 3 Position ON-OFF-ON |
| Current Rating | 40 Amps |
| Date First Available | June 30, 2021 |
| International Protection Rating | IP65 |
| Item Weight | 4.8 ounces |
| Item dimensions L x W x H | 4.3 x 4.3 x 5.3 inches |
| Item model number | SZW26-40/D303.3D |
| Manufacturer | Baomain Electric |
| Number of Positions | 3 |
| Operating Voltage | 660 Volts |
| Operation Mode | ON-OFF-ON |
| Product Dimensions | 4.3 x 4.3 x 5.3 inches |
| Terminal | Screw |
| Unit Count | 1.0 Count |
| Wattage | 26400 watts |

## Product Details

- **Brand:** Baomain
- **Connector Type:** Screw
- **Contact Type:** No Nc
- **Current Rating:** 40 Amps
- **Item dimensions L x W x H:** 4.3 x 4.3 x 5.3 inches
- **Material:** Plastic
- **Operating Voltage:** 660 Volts
- **Operation Mode:** ON-OFF-ON
- **Switch Type:** Rotary
- **Terminal:** Screw

## Images

![Baomain Universal Rotary Changeover Switch SZW26-40/D303.3D with Master Switch Exterior Box 660V 40A 3 Position 12 Terminals 3 Phase - Image 1](https://m.media-amazon.com/images/I/61Jfkz3X+IL.jpg)

## Questions & Answers

**Q: What are the locations ot the output of the input locations 1 and 2?**
A: The outputs and inputs are located on the mechanical dial.  Use a multimeter to check current path

**Q: I know this is designed and speced for AC, but is there any reason it could not do DC?  Specifically 90V@10A Max (for a DC motor).**
A: A switch is a switch, it doesn't matter if it is ac or dc.  Amperage does count, however, and since this switch is rated for 40 amps your 10a motor should be perfectly ok.

**Q: Will the terminals accept #12 wire?**
A: In my experience, I had no need to use number 12 wire, but my assumption is the way the clamps work that it would hold # 12 wire. You could always put a feral on the end to make it larger if necessary.

**Q: Is it alright to install this box inside a wall? If yes, anything needs to be done before installation?**
A: You can as long as you are not going over the rated amps. I'm assuming you are going to leave the switch on the outside of the wall.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works Perfect
*by D***S on January 23, 2026*

Perfect for manual transfer of shore/inverter power. I was also able to incorporate my converter wiring to bypass it at the same time, so I am not converting while inverting.

### ⭐⭐⭐⭐⭐ Perfect Switch
*by B***R on February 23, 2024*

I purchased this switch to use in my emergency power backup system for our home. I have had a gas powered standby generator for years and wanted to add a solar/battery generator, as well. One generator feeds 240V, 30amp power while the other feeds 120V, 30amp power. I needed a way to connect both generators to an existing transfer switch, but be able to select which power source was feeding the system. This switch was the perfect solution to that need. With three contacts on all sides of the switch, it accommodated the two power legs and neutral from the 240V generator feeding the same on the output side of the switch. The single power leg and neutral from the 120V generator, along with a jumper, provided the other power to the three wire output. Since there were two inputs to the switch going to a single output, three jumpers were also required. Be aware that the knockouts on the switch box are not standard size but are sized for the rubber grommets that come with the box. Consequently, a standard 1/2" or 3/4" cable connector will not work. An optional 2-part cable connector that can be slipped into the knockout holes will be needed. Also, you will have 11 or 12 10ga. solid copper wires coming into this box that will be very hard to compress into the box once your switch is wired. It can be done with special attention to placement of the wires, though, and when place in service, this is a top quality switch.

### ⭐⭐⭐⭐ Works, Limited Space, No Wiring Instructions
*by W***. on November 18, 2025*

It works fine. I agree with other reviews that the wiring instructions are almost nonexistent. And space is limited in the case for 10awg wire and jumpers.

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-03-19*