What does n mean in the L dimension?

n is the number of contact system stages. The final depth increases with contact stage count, so cabinet clearance must be confirmed against the final contact program. This is important for compact enclosures because terminal access and wire bend radius can become the limiting factors.

Can LW42 be supplied with key-lock or padlock handles?

Yes. The catalogue shows key-lock mounting and padlock mounting formats. Specify whether the project needs key removal positions, lockable OFF position, a red-yellow safety handle, or a standard black handle with position markings.

What standards should be checked for LW42 projects?

For low-voltage rotary switch applications, IEC 60947-3 is the main standards context to confirm. For North American panels, tell Shieldhz whether UL 508 documentation or model-level label confirmation is required. Do not assume every handle or contact variant carries the same certification package.

Can Shieldhz provide drawings, samples, and certificates before batch production?

Yes. Request the datasheet, installation drawing, certificate copy, and sample plan before a batch order. Include quantity, target market, panel cutout, contact program, handle legend, and delivery schedule so the quotation includes the correct document package and lead time.

How should I request a quotation?

Send model class, current, voltage, installation type, contact program, handle marking, number of stages, quantity, and target certification requirement. A wiring diagram is preferred because it lets Shieldhz confirm the contact sequence before pricing and reduces the risk of ordering the wrong switch program.

Shieldhz LW42 rotary cam switch collection with preserved product colors for panel, DIN rail, single-hole, and waterproof box formats

LW42 Series Universal Changeover Switch

LW42 Rotary Cam Switch20A to 32A, 440V AC

Name: LW42 Rotary Cam Switch
Brand: Shieldhz
Availability: InStock

Compact universal rotary cam switch for panel mounting, single-hole mounting, key-lock operation, and padlock handle assemblies. Use LW42 for control panels that need clear position switching with configurable contact stages.

View Technical Parameters Request a Quote

20A / 25A / 32AThermal Current Ith

440V ACRated Voltage Ue

AC-23A20A to 32A

0.3M cyclesMechanical Life

Certified & Standards-Based

Mounting options

Choose the LW42 Assembly Format

Use the assembly images as the first selection step. Each format changes panel cutout, cabinet depth, rail space, enclosure clearance, and handle access.

Single-hole mounting

Front-panel installation through one opening. Confirm hole size, panel thickness, anti-rotation detail, and rear depth.

DIN-rail mounting

Cabinet rail installation. Confirm rail position, handle access, wire bend radius, and terminal clearance.

Waterproof box assembly

UKP0/SHT0 enclosure setup for wet-area or dust-prone positions. Confirm IP level, cable entry, box model, and handle type.

Panel mounting

Door or plate-mounted operator control. Confirm handle color, marking, OFF position, and contact stack depth.

Series Position

Universal Changeover Switch for Compact Panels

LW42 covers 20A, 25A, and 32A current classes with several operation formats. It sits alongside the LW28 rotary cam switch family, but is positioned for compact control cabinets, small machinery panels, HVAC control boxes, and operator stations where panel space is limited.

Standardized footprintOptimized for compact operator layouts and repeated cabinet builds.

Versatile schematicsSupports custom contact sequences for motor control and source selection.

Technical Parameters

LW42 Electrical Ratings

Use these ratings as the first sizing filter. Final selection still depends on utilization category, contact program, installation depth, and certificate market.

Model	Ith A	AC-23A Ie A	AC-3 Ie A
LW42-20	20	20	11
LW42-25	25	25	15
LW42-32	32	32	18

Selection Guide

How To Specify An LW42 Switch

Follow this four-step process to ensure the correct model configuration for your project.

Project inputs

Current rating, load duty, quantity, and target market.

Assembly route

Single-hole, DIN-rail, waterproof box, or panel mounting.

Contact program

Handle positions, switching sequence, marking, and stage count.

Confirmed package

Model code, drawing route, sample plan, certificate scope, and lead time.

Drawing checks

From Route Inputs to Final Drawing

Final dimensions are assembly-dependent. Treat the route, panel opening, rear space, and switching program as one linked confirmation path before sample or batch production.

Input 01CutoutHole size, panel thickness, and anti-rotation detail.

Input 02Rear depthContact stages, terminal access, and wire bend radius.

Input 03EnclosureUKP0/SHT0 route, cable entry direction, and IP requirement.

Input 04MarkingHandle color, OFF position, plate legend, and target market.

Engineering check

Assembly lock

Match route with contact program
Confirm drawing depth and terminal clearance
Check certificate and enclosure scope

Output

Quotation package

Model code, final drawing, route notes, and document package before production.

ModelDrawingQuote

Quality Control

Function Check Before Batch Production

LW42 is usually selected by switching program and installation structure, not only by current rating. For OEM projects, provide the target panel layout, handle legend, position count, and wiring sequence so Shieldhz can confirm contact stage count, terminal arrangement, marking, and document package.

View resources

Applications

Built for Control Panels

Use LW42 where compact panels need a clear rotary position, a confirmed contact program, and front-facing operator control.

Control panelsMode selection, source changeover, and local or remote operation.
MachineryCommand circuits for pumps, fans, conveyors, and small equipment panels.
Maintenance accessPanel-mounted or enclosure-mounted handles for visible OFF-position control.

Frequently Asked Questions

Technical support for the LW42 rotary cam switch series.

What current ratings are available for LW42?

LW42 covers 20A, 25A, and 32A current classes with 440V AC rated operational voltage on this page.

Which rating should be used for motor loads?

Use AC-23A or AC-3 according to real switching duty. Share motor power and switching frequency before final selection.

Which installation formats are available?

Single-hole mounting, DIN-rail mounting, waterproof box assembly, and panel mounting are shown in the product section.

Can Shieldhz customize the contact program?

Yes. Send handle positions, contact sequence, panel legend, and wiring diagram so the contact table can be checked.

What should be confirmed before quotation?

Confirm current class, installation route, switching program, handle requirement, certificate market, quantity, and lead time.

Line art showing Shieldhz rotary switch product routes

Quote

Request an LW42 Quote

Send current rating, mounting route, contact program, and quantity. Shieldhz will confirm the model code, drawing route, and lead time.

For direct email, contact [email protected] or [email protected].