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Shieldhz rotary cam switches cover selector control, source changeover, load isolation, and motor-control duties in industrial panels and equipment. Choose LW28, LW42, or SH30 by current rating, contact program, mounting style, and IEC 60947-3 duty category.
Pick the right rotary cam switch family for selector control, changeover switching, load isolation, and panel-mounted industrial control applications.
Universal rotary cam switch route for selector, changeover, meter selection, and multi-position cam programs.
Compact rotary cam switch route for 20A, 25A, and 32A panel mounting, single-hole mounting, key-lock operation, and padlock handles.
Load isolator switch route for safe main-circuit isolation, service disconnects, HVAC, ventilation, and water pump systems.
Use this guide to choose between universal rotary cam switch logic, compact changeover switch assemblies, and SH30 load isolator switch routes before moving into model code details.
| Usage Scenario | Recommended Series | Why | Installation / Notes |
|---|---|---|---|
| Selector, changeover, reversing, meter selection, and multi-position cam logic | LW28 | Broad universal cam switch program range from 10A to 315A | Confirm contact sequence, handle angle, poles, and mounting route |
| Compact panel or single-hole rotary switching at 20A to 32A | LW42 | Compact 440V AC changeover switch format with key-lock and padlock options | Use when panel depth, handle style, and compact installation matter |
| Motor control commands, source transfer, and equipment start/stop logic | LW28 / LW42 | Cam-operated contacts support defined selector and changeover positions | Size by load duty, voltage, AC-23A reference, and wiring diagram |
| Main circuit isolation, load break, service disconnect, and visible OFF | SH30 | Load isolator route for padlockable and door-interlock disconnection | Choose pole count, handle type, enclosure requirement, and installation depth |
| Outdoor or harsh environments | SH30 / Waterproof Box | Enclosed isolator and rotary switch box routes provide higher protection | Confirm IP rating, cable entry, UV exposure, and enclosure size |
Final selection should confirm current rating, voltage, AC-23A or AC-3 duty, poles, contact program, handle marking, mounting route, and certification requirement.
Panel-mounted rotary cam switches for selector, changeover, and metering inside electrical control cabinets.
Control cabinet switch productsLW28 and LW42 routes for OEM panels where depth, handle style, and wiring space matter.
View LW28 panel switch routeMotor control, source transfer, and load isolation for pumps, fans, and HVAC equipment.
View SH30 motor isolator routeWeatherproof local disconnects and enclosed rotary switch boxes for outdoor equipment.
View waterproof rotary switch boxesShieldhz is the switch brand of Zhejiang Shihe Electric Co., Ltd., founded in 2014, with ISO 9001 production management and a 5,000+ sqm industrial control component factory. Our team helps match the series, confirm documents, and keep the order path clear from sample request to production shipment.
Application, wiring, mounting, CE/TUV/UL/CCC document scope, and drawing checks before quotation.
LW28, LW42, and SH30 cover panel cam switching, compact changeover, and load isolation.
Stock models, certificate files, export documents, and shipment coordination for distributor and OEM orders.
Use our inquiry code logic and series comparison to confirm the right rotary switch family before checking datasheets, dimensions, wiring diagrams, and certificates on the series or resource pages.
Choose the series that matches your application, then confirm the detailed model code on the matching series page.
| Series | Current Range | Pole Options | Positions | Key Features |
|---|---|---|---|---|
| LW28 | 10A – 315A | 1P – 12P | 2 – 12 | Universal cam switch for selector, changeover, metering, and custom cam logic |
| LW42 | 20A / 25A / 32A | Compact panel formats | 2 – 24 | 440V AC compact changeover switch route with key-lock and padlock options |
| SH30 | 20A – 125A | 2P / 3P / 4P | 2 (On-Off) | Load isolator for visible OFF, padlockable, door-interlock, and IP65 enclosure routes |
For pre-wired boxes for outdoor and harsh environments.
Open waterproof pageFor solar PV string and inverter isolation solutions.
Open PV isolator pageDatasheets, user manuals, certificates, and code guides.
Open switch downloadsKey technical checks before selecting your rotary switch.
Open engineering checklistEnsure you have all details ready for purchasing.
Send procurement detailsA rotary cam switch is a manually operated electrical switch that uses a cam mechanism to open and close contact blocks in defined handle positions. It is used when one rotary handle needs to control selector functions, source changeover, motor commands, meter selection, or custom circuit routing inside a control panel.
A rotary cam switch is used for selector switching, ON-OFF control, 1-0-2 changeover, motor control commands, voltmeter or ammeter selection, and staged control logic. In industrial panels, it lets operators route power or control circuits through fixed handle positions without using multiple separate switches.
Choose a rotary cam switch by matching the rated current, operational voltage, pole count, switching angle, contact program, handle type, and mounting method to the circuit. For motor or inductive loads, check the AC-23A duty rating instead of sizing only by thermal current.
A rotary cam switch is mainly used for circuit routing, selector logic, meter selection, and changeover functions. An isolator switch is mainly used for visible OFF, padlockable disconnection, maintenance safety, and load isolation. Use LW28 or LW42 for cam logic, and use SH30 when the job is local isolation.
LW28 is the broad universal cam switch route for 10A to 315A selector, changeover, and metering programs. LW42 is the compact route for 20A, 25A, and 32A panel or single-hole switching formats. SH30 is the load isolator route for visible OFF, padlockable, and door-interlock disconnection.
Send the rated current, voltage, load type, pole count, contact program or wiring diagram, handle positions, mounting method, handle marking, enclosure requirement, quantity, and target certification market. If the exact code is unknown, share the application and circuit function so engineering can route the right LW28, LW42, or SH30 series.
Yes. Waterproof rotary switch solutions are available when the application needs cable entry, enclosure protection, outdoor mounting, or harsh-environment operation. Check the switch front-panel IP rating and the full enclosure IP rating separately; use the waterproof isolator box route when IP65/IP67 enclosure protection is part of the requirement.
Share current rating, switching function, quantity, target certification market, and delivery schedule. Our engineering team will match the LW28, LW42, or SH30 series and confirm MOQ, lead time, and documentation package.
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