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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.
LW42 covers 20A, 25A, and 32A current classes with several front 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, handle format, and contact sequence need to be confirmed together.
Use this page when the project needs a compact universal changeover switch with a defined contact program. If the duty is closer to main circuit isolation, lockable OFF operation, or a higher isolation role, compare the related SH30 load isolator switches before final selection.
Use these ratings as the first sizing filter, then confirm utilization category, contact program, installation depth, and target certification market before quotation. LW42 should be selected by real AC switching duty, contact arrangement, and handle structure, not by thermal current alone.
| Model | Ith A | Ue V | AC-23A Ie A | AC-3 Ie A | Life |
|---|---|---|---|---|---|
| LW42-20 | 20 | 440 | 15 | 11 | Mechanical 0.3 x 10^6 cycles; electrical 0.05 x 10^6 cycles; operating frequency 120 times/hour. |
| LW42-25 | 25 | 440 | 20 | 15 | Mechanical 0.3 x 10^6 cycles; electrical 0.05 x 10^6 cycles; operating frequency 120 times/hour. |
| LW42-32 | 32 | 440 | 25 | 18 | Mechanical 0.3 x 10^6 cycles; electrical 0.05 x 10^6 cycles; operating frequency 120 times/hour. |
Ith = conventional thermal current. Ue = rated operational voltage. Use the AC-23A or AC-3 value when sizing for motor or inductive load switching. For simple resistive or mixed loads, state whether the project uses AC-21A, AC-22A, or AC-23A duty so the contact program can be checked against the real load profile.
For standards review, compare the switch application against IEC 60947-3. For North American panels, state whether UL 508 documentation or label confirmation is required; certificate coverage must be confirmed by model, handle format, contact program, and target market.
Use the installation format before confirming panel cutout, rail position, enclosure clearance, handle style, and rear wiring space. LW42 can be supplied as a single-hole switch body, DIN-rail assembly, waterproof box assembly for SHP0/SHT0 routes, or panel-mounted assembly. Final dimensions and certificate package should be checked against the selected assembly.
| Installation route | What to confirm | Drawing note |
|---|---|---|
| Single-hole mounting | Hole size, panel thickness, anti-rotation detail, rear contact depth, and terminal access. | Confirm final A/B/L values from the selected LW42 model and contact stage count. |
| DIN-rail mounting | Rail position, cabinet depth, handle access, terminal clearance, and wire bend radius. | Confirm assembly drawing because rail bracket and contact stack change the installed depth. |
| Waterproof box assembly | SHP0/SHT0 box route, cable entry, IP requirement, handle type, and target certificate market. | Confirm enclosure drawing and cable gland direction before sample or batch production. |
| Panel mounting | Front plate size, handle color, OFF/ON marking, contact stages, and rear clearance. | Confirm final panel drawing because handle, plate, and contact program affect assembly depth. |
Final dimensions are assembly-dependent. n = number of contact system stages where the model drawing uses stage-based depth. Send the selected installation route, panel opening, available rear depth, and switching program with the inquiry so Shieldhz can confirm the drawing before production.
Select LW42-20, LW42-25, or LW42-32 according to operating current and required AC-23A or AC-3 duty. Do not size from Ith alone when the switch controls a motor, transformer, or other inductive load.
Choose single-hole mounting, DIN-rail mounting, waterproof box assembly, or panel mounting according to cabinet design and installation environment. Include panel opening, rail layout, enclosure model, handle color, marking requirement, and available rear depth.
Share the required handle positions, contact sequence, wiring diagram, and panel legend. If you already have a catalogue code such as D0414, 9C04, D0081, C04, or GSC, include it with the inquiry; otherwise Shieldhz can check the switching program from the function table before confirming the model code.
Ask for the datasheet, installation drawing, certificate copy, sample quantity, MOQ, and lead time before batch production. For broader product routing, return to the rotary cam switches category page.
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 check the contact stage count, handle option, terminal arrangement, marking, and document package before samples or batch production. For drawings, datasheets, and certificate routing, use the Shieldhz resources page or send the exact model requirement through contact sales.
LW42 is suited to compact control panels that need defined rotary positions, repeatable switching logic, and a front interface that is easier to read than a small toggle or push button group. Use it when the load is moderate but the switching sequence still needs a cam-programmed contact arrangement.
Use LW42 for AUTO-MANUAL, LOCAL-REMOTE, phase selection, and small source transfer functions where the operator needs a clear handle position. For higher current or larger contact programs, compare the LW28 series.
For pumps, fans, conveyors, and compact machinery, LW42 can switch control circuits or moderate AC loads when the AC-23A or AC-3 rating matches the real duty. Share motor power, voltage, and switching frequency before selecting the final contact program.
Panel-mounted and waterproof-box assemblies give panel builders practical options for visible operator control, outdoor or wet-area placement, and controlled OFF-position marking. They do not replace a full machine safety assessment, so lockout requirements and certificate scope should be confirmed by project.
This LW42 range covers LW42-20, LW42-25, and LW42-32 with conventional thermal currents of 20A, 25A, and 32A. The rated operational voltage shown on this page is 440V AC. Use the table as a starting point, then confirm the real switching duty, contact program, and installation format before ordering.
Use the AC-23A or AC-3 line according to switching duty. AC-23A values are 15A, 20A, and 25A for LW42-20, LW42-25, and LW42-32 respectively. If the load is mixed or highly inductive, share the motor power and switching frequency so the engineering team can check whether LW42 or a larger series is more suitable.
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.
The current LW42 product image set covers single-hole mounting, DIN-rail mounting, waterproof box assembly for SHP0/SHT0 routes, and panel mounting. Handle color, OFF-position control, enclosure model, and certificate scope should be confirmed by the selected assembly.
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, contact program, or mounting variant carries the same certificate package.
Yes. Request the datasheet, installation drawing, certificate copy, and sample plan before a batch order. Include quantity, target market, installation route, panel cutout or enclosure model, switching program, handle legend, and delivery schedule so the quotation includes the correct document package and lead time.
Send model class, current, voltage, installation route, switching program, handle marking, number of contact 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.
Share current class, installation route, switching program, handle requirement, quantity, target certificate market, and delivery schedule. Shieldhz will confirm the LW42 model code, drawing route, sample plan, and batch lead time.
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