M22-WRK

1. Overview

The Eaton M22-WRK is a non-illuminated, 2-position maintained selector switch operator belonging to Eaton's RMQ-Titan M22 modular pilot device family. It features a black knob-style actuator with a silver non-metallic bezel and mounts in a standard 22.5mm panel cutout. The "maintained" operation means the switch holds its selected position (I or 0) until deliberately rotated to the other position — it does not spring back. The M22-WRK ships as an operator-only unit (actuator + bezel + M22-A fixing adapter); contact blocks must be added separately to complete the switching circuit. The modular architecture allows up to six contact blocks to be stacked onto a single operator, enabling flexible circuit configurations without additional panel holes.

2. User Sentiment

Distributor listings and forum references reflect consistent positive regard for the M22 series among industrial electricians and panel builders. Key themes include:

• Ease of installation: The integrated anti-rotation tab and central nut mounting allow single-sided panel assembly — a practical advantage when the rear of a panel is inaccessible during installation.
• Modular flexibility: The ability to field-convert between maintained and momentary operation via coding adapters, and to add contact blocks on-site, is frequently cited as reducing the need to stock multiple SKUs.
• Build quality: The 5-million-cycle mechanical rating and IP66/NEMA 4X sealing are viewed as over-engineered for typical duty — a positive attribute in demanding environments.
• Price-performance: Retail pricing in the $10–$17 USD range (operator only) is considered reasonable for the protection class and build quality offered.

No significant negative sentiment identified in available distributor or technical sources.

3. Real-World Applications

The M22-WRK is a general-purpose industrial selector switch suited to any application requiring a durable, panel-mounted 2-position maintained control. Documented and inferred use cases include:

• Machine control panels: Start/Stop mode selection, Auto/Manual switching, Local/Remote control selection.
• Industrial automation and PLC input panels where a simple binary state input is needed.
• Washdown environments (food processing, beverage, pharmaceutical) due to IP66/IP67/IP69K capability across the M22 family.
• High-vibration equipment (compressors, presses, conveyors) leveraging the robust RMQ-Titan mechanical design.
• ASi (Actuator-Sensor Interface) bus-connected control systems via optional adapter modules, enabling digital fieldbus integration without separate I/O modules.
• OEM panel builders who need a standardized 22mm footprint compatible with a broad ecosystem of Eaton contact blocks and accessories.

4. Technical Specifications

• Type: Non-illuminated 2-position maintained selector switch operator (knob style)
• Series: Eaton RMQ-Titan M22
• Mounting hole: 22.5 mm (standard 22mm notched hole with anti-rotation tab)
• Actuator: Black knob with platinum/silver bezel (non-metallic nylon housing)
• Positions: 2 (I and 0)
• Throw angle: 40°
• Operating mode: Maintained (stays in position; field-convertible to momentary via coding adapter)
• Contact blocks: Operator only — accepts up to 6 front-mount M22-K series contact blocks (e.g., M22-K10: 1NO; M22-K01: 1NC; M22-K11: 1NO+1NC; M22-K20: 2NO; M22-K22: 2NO+2NC)
• Contact rating (with K11 block): 3A at 230VAC
• Enclosure rating: IP66, NEMA 4X, NEMA 13 (dust-tight, watertight, corrosion-resistant)
• Mechanical life: 5,000,000 operating cycles
• Operating temperature: -25°C to +70°C (approx. -13°F to 158°F)
• Fixing adapter: M22-A included
• UPC: 786685281667
• Eaton catalog number: M22-WRK (216867 in some regional catalogs)
• Compatible bus systems: ASi protocol via optional adapter module

5. Ordering & Compatibility

The M22-WRK is the operator actuator only. To build a complete selector switch assembly, one or more contact blocks from the M22-K series must be ordered separately and mounted to the M22-A adapter. Common complete-unit combinations available pre-assembled include:

• M22-WRK-K10 (216518): operator + 1NO contact block
• M22-WRK-K11: operator + 1NO/1NC contact block
• M22-WRK-K20 (216520): operator + 2NO contact blocks

The M22-WRK is stocked by major industrial distributors including Newark (10R1877), Rexel USA, Platt Electric, IMC Direct, and Kent Store, typically priced $10–$17 USD for the operator. The product carries CE and UL certifications for global deployment. The entire M22 series uses a shared 22.5mm panel footprint, making it directly interchangeable with other M22 operators (pushbuttons, illuminated types, key switches) without re-drilling.

6. Known Issues

No significant issues reported. One minor note: IP rating varies slightly across distributor listings — some cite IP65, others IP66. Eaton's own documentation and premium distributor listings (Rexel, Platt, RS Components) consistently reference IP66 and NEMA 4X as the correct ratings for the M22-WRK. The discrepancy likely reflects older catalog entries; the current product meets IP66. Operating temperature is occasionally listed incorrectly in third-party listings (-13°C to 158°C rather than the correct -25°C to +70°C); users should verify against Eaton's official datasheet for critical applications.