ZHUCO SZW26-20/YH5.3HH Long Silver Panel Red Handle Seven-Position Three-Channel Voltage Changeover Switch

The SZW26-20/YH5.3HH is a seven-position, three-section, three-phase voltage conversion and measurement switch from the ZHUCO brand. It features a long, silver metal panel design with a prominent red rotary handle, offering a professional appearance and high visibility. It is suitable for voltage measurement and switching in three-phase four-wire systems (including the neutral wire).

This product has a rated current of 20A and is suitable for electrical circuits with AC 50/60Hz, a rated operating voltage of ≤ 440V, and an insulation voltage of 690V. It is widely used in industrial power distribution and power monitoring fields.

Core Functions and Features

Seven-Position Measurement Switching:
Through the rotary knob positions TR–ST–RS–0–RN–SN–TN, it can sequentially measure the three-phase line voltages (Urs, Ust, Utr) and the phase voltages of each phase to the neutral line (Urn, Usn, Utn), enabling comprehensive monitoring of the three-phase system voltage.

Clear Operation Indicator:
The red handle with clear scale markings provides a good feel and accurate positioning, facilitating quick switching and readings on-site.

Reliable Structural Design:
It adopts a flame-retardant housing structure, with built-in silver alloy contacts and thickened copper conductors, ensuring excellent conductivity and stable and reliable measurement circuits, guaranteeing safety and durability for long-term use.

Panel Mounting:
The long silver metal panel is sturdy and aesthetically pleasing, suitable for standard control cabinet and distribution cabinet panel mounting, ensuring overall coordination.

Main Technical Parameters

Rated Current: 20A

Mechanical Life: ≥ 1 × 10⁵ cycles

Electrical Life: ≥ 3 × 10⁴ cycles (operating frequency 120 times/hour)

Operating Ambient Temperature: -25℃ ～ +40℃

Installation Altitude: ≤ 2000 m

Typical Application Scenarios

Widely used in distribution cabinets, control boxes, power monitoring systems, and equipment commissioning and maintenance sites, it provides safe, intuitive, and convenient switching and measurement of line voltage and phase voltage in three-phase AC systems. It is an ideal choice for electrical engineering commissioning, operation monitoring, and fault diagnosis.

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PRODUCT SIZE

Internal wiring diagram

Panel size(mm)

Shape size(mm)

lnstallation size(mm)

TECHNICAL PARAMETERS

Name	Change Over Switch
Brand	ZHUCO
Model	SZW26-20/YH5.3HH
Rated working voltage	AC440V、DC240V、DC120V
Rated insulation voltage	660/690V
Rated impulse withstand voltage	4kV
Conventional heateing current	20A
Rated working current	AC-23A: 15A; AC-3: 11A; AC-4: 3.5A; DC-21A: 0.4A、1A
Rated short-time withstand current	180A/1s
Rated short-circuit making capacity	254A
Use category	AC-23A、AC-3、AC-4、DC-21A
Polar number	3
Meet the standards	GB/T 14048.3-2017
3C Certificate Number	2024010302651029
CE testing standard	EN 60947-5-1:2017
CE Certificate number	TLZJ21072132378

About Us

Zhejiang Zhuochao Electric Co., Ltd.

Founded in 2012, Zhejiang Zhuochao Electric Co., Ltd. has been specializing in the wholesale of ZHUCO SZW26-20/YH5.3HH Long Silver Panel Red Handle Seven-Position Three-Channel Voltage Changeover Switch supplier. In particular, the company's ZHUCO SZW26-20/YH5.3HH Long Silver Panel Red Handle Seven-Position Three-Channel Voltage Changeover Switchtches feature advanced technology in the industry in the industry. Our products have obtained ISO 9001 Quality Management System Certification, National 3C Certification, TUV Certification, CE Certification and RoHS Certification, and are manufactured in strict compliance with national standards. They enjoy a strong market presence across China and are exported to numerous countries and regions in Europe, the Americas and Southeast Asia. We have also established cooperative partnerships with a number of internationally renowned brands.
Equipped with advanced production equipment and precision testing instruments, the company has introduced high-tech production processes and experienced engineers, providing support for product R&D, quality upgrading and management innovation. Thanks to the joint efforts of all employees and the strong support of domestic and overseas customers, we have accumulated rich experience in design, production and manufacturing. Currently, the company is committed to further expanding its overseas market share, and developing domestic market channels and customers. It also try to innovate marketing strategies, and build a sound market order to fully safeguard the interests of agents and customers. We unswervingly adhere to a clear market positioning, focus on two core points—technology innovation & reliable quality and marketing channel enhancement, and regard quality product, standardized market pricing and comprehensive after-sales service as three three fundamental commitments, so as to create a win-win development situation for both manufacturers and distributors.
Facing a promising future, the company will uphold the tenet of providing better products and services to satisfy customers. Relying on advanced modern enterprise management, we will deepen internal reforms, fully implement the quality assurance system, and carry forward the spirit of "Pragmatism, Integrity, Innovation and Progress". Looking ahead, we will continuously adjust the industrial structure, expand capital strength, implement the brand strategy, and march towards the global market!

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