LW28 Rotary Cam Switch 10A to 315A, IEC 60947-3

Start with three parameters: rated current, switching function, and mounting method. First, determine the load current and apply a 1.25 safety factor — for motor loads use the AC-23A rating, for resistive loads use AC-21A. Second, identify the required switching sequence (ON-OFF isolation, source changeover, or multi-position selection). Third, confirm the panel cutout and shaft arrangement. Use the Quick Match tool above to filter by these three criteria, then send inquiry for exact contact program code and pricing.

A stay-put (detent) cam switch holds its position after rotation — the contacts remain in the selected state until the operator turns the handle again. This is the standard type for power isolation, source switching, and motor start/stop duties. A spring-return cam switch automatically returns to the neutral (zero) position when the operator releases the handle, producing a momentary signal. Spring-return types are used for jogging, pulse commands, and test circuits. Most LW28 standard models are stay-put; spring-return variants are available on request.

These are IEC utilization categories that define the switching duty the contacts are rated for. AC-21A covers switching of resistive and slightly inductive loads. AC-22A covers mixed resistive and inductive loads including small motors. AC-23A is the most demanding category, covering switching of motor loads and other highly inductive circuits — this is the relevant figure for most industrial machinery applications. Always check the AC-23A current value against your actual motor load current. For example, the LW28-63 carries an AC-23A rating of 57A despite its 63A thermal current — select the next size up if your motor load approaches that boundary.

The LW28 front panel achieves IP65 per IEC 60529 when correctly installed in a panel cutout — full dust-tight protection and resistance to low-pressure water jets. The rear terminal area relies on the enclosure for environmental protection. For applications requiring IP67 (temporary immersion) or higher, the SH30 isolator switch series offers IP67-rated options. For outdoor or marine installations, verify the full enclosure IP rating in addition to the switch front panel rating.

LW28 series cam switches are designed and tested to IEC 60947-3 (low-voltage switchgear: switches, disconnectors, and fuse-combination units) and the equivalent Chinese national standard GB14048.5. For North American projects, UL 508 is the relevant industrial control equipment standard. Certified models carry CE, TUV Rheinland, UL, CCC, and UKCA markings depending on variant and current rating.

Yes. LW28 cam switches are commonly used for motor reversing (forward-off-reverse), star-delta starting, and dual-speed motor selection in industrial machinery panels. The correct contact program code must match the required wiring sequence — D1050 is a multi-position changeover program suitable for reversing and transfer duties, while D0401 handles basic ON-OFF isolation. For motor control applications, select the model based on the AC-23A current rating (not thermal current). If you have an existing wiring diagram, share it at inquiry and we will confirm the correct contact program code.

Yes. Shieldhz supports OEM configurations including custom contact programs, non-standard handle colors (beyond standard black, red, white, and grey), custom panel markings and engravings, and specific certification variants. Standard production models ship from stock or within short lead times; custom configurations require MOQ and tooling lead time confirmation. To request a custom specification, send your application requirement, target current rating, quantity, and any reference drawings to [email protected] and the engineering team will respond within 24 hours.