A22-FR-01M

1. Overview

The Omron A22-FR-01M is a 22 mm flush-head momentary push button with a red actuator and a single normally-closed (1NC) screw-terminal contact block. The flush design sits level with the panel surface, reducing accidental actuation — critical in industrial control panels. Red color coding and NC contact configuration make this model suited for stop, emergency-stop, or inhibit functions per IEC 60204-1. Part number decodes as: A22 = family, F = flush head, R = red, 01M = 1NC screw-terminal (M-type) contact block. Part of Omron's established A22 family, it accepts the full range of modular A22 accessories.

2. User Sentiment

Industrial engineers and panel builders regard the Omron A22 series as reliable, long-life workhorses. Users cite consistent actuation force, positive tactile feedback, and a modular architecture allowing contact blocks to be replaced without disturbing wiring or the actuator. Typical street price is ~$22–$23 USD; the reliability premium over generic alternatives is considered justified for safety-critical and high-cycle applications. The NC contact variant is specifically favored for stop circuits because a wiring fault or open circuit defaults to "stop" — a fail-safe principle. Stock availability varies across distributors; some sampled outlets show zero inventory, though the part is available through 60+ authorized global distributors.

3. Real-World Applications

• Machine stop buttons on CNC machining centers, lathes, and injection molding presses
• Conveyor and material-handling control panels for halting belt movement
• Pump and motor control panels requiring fail-safe stop functionality
• HVAC control cabinets where flush mounting prevents accidental activation
• Elevator and lift stop/call buttons
• Safety interlock circuits wired in series with safety relays
• Process control panels in food processing, pharmaceutical, and chemical plants

4. Technical Specifications

• Type: Momentary flush-head push button, 22 mm panel cutout
• Color: Red
• Contact Configuration: 1NC (normally closed), SPST-NC
• Contact Block Type: M-type (screw terminal)
• Rated Voltage: 250 VAC / 110–125 VDC
• Rated Current: 10 A AC resistive; 6 A DC resistive
• Actuation: Momentary (spring return)
• Electrical Life: 500,000 operations minimum
• Mechanical Life: 1,000,000 operations minimum
• Protection Rating: IP65 (front face, panel mounted)
• Operating Temperature: -25°C to +70°C
• RoHS Compliance: Yes
• Standards: IEC 60947-5-1, UL listed, CE marked
• Compatibility: Full A22-series accessory ecosystem (contact blocks, LED lamps, legend plates)

5. Ordering & Compatibility

Available from Mouser, DigiKey, RS Components, Farnell, Arrow, Avnet, and 60+ other authorized distributors. Street price ~$22–$23 USD per unit. Check real-time stock as inventory varies. Compatible with the full A22 accessory ecosystem: additional contact blocks (NO or NC), pilot light/LED lamp modules, legend plates, and protective covers mount without replacing the actuator. Common companion parts: A22-10M (1NO contact block), A22-01M (1NC contact block), A22-P lamp units, A22-K protective cover. Alternate distributor part number: A22FR01MOMA. Remains in active production as of 2026; typical lead time from stock 1–3 business days.

6. Known Issues

Contact oxidation can occur in very low-current signal circuits (below 10 mA) using standard silver-alloy contacts; gold-contact variants should be specified for signal-level applications. M-type screw terminals require a small flat-head screwdriver and can be fiddly in tight enclosures. Intermittent stock shortages occur at some distributors; check multiple sources. No product recalls or safety notices have been issued for the A22 series.