Push Button and Pilot Light Accessories Selection Guide
When selecting push button and pilot light accessories, compare NO/NC contact blocks, 24 V/230 V LED modules, Ø22 mm legend plates, silicone boots and empty stations.
This guide explains what to look for when choosing products in the Push Button and Pilot Light Accessories and Spare Parts category for Ø22 mm control stations, contact blocks, LED modules, legend plates and protective shrouds.
Add-on contact blocks (1 NO / 1 NC) and integral LED modules
Modular Ø22 mm push buttons and selector switches accept snap-on Normally Open (NO — Green/3-4) and Normally Closed (NC — Red/1-2) contact blocks on their mounting collar to switch multiple circuits simultaneously. Illuminated actuators pair with a center LED module matched to the control supply voltage (24 V AC/DC or 230 V AC) and lens color. Because snap-fit latches are series-specific, always match contact blocks and collars to the exact brand and series of the actuator head.
Legend plates, yellow E-stop rings, silicone boots and empty enclosures
Clear operator identification uses Ø22 mm legend holders (Start, Stop, Reset, Hand-O-Auto) and high-visibility Yellow Emergency Stop rings (Ø60 / Ø90 mm). Harsh washdown or dusty areas use transparent silicone protective boots, unused panel cutouts are sealed with Ø22 mm blanking plugs, and remote stations are built using 1-hole to 6-hole empty pushbutton enclosures.
Push button and pilot light accessories comparison table
| Accessory Group | Core Items | Key Compatibility Parameter | Engineering Purpose |
|---|---|---|---|
| Electrical Blocks | 1 NO contact, 1 NC contact, 24 V / 230 V LED module | Must match actuator brand/series; front vs base mount | Add switching poles or replace worn contacts/LEDs |
| Legends & Markers | Ø22 mm legend plates, engraved inserts, yellow E-stop discs | Ø22.5 mm hole diameter, standard control text/symbols | Clear operator labeling per IEC 60204-1 |
| Guards & Plugs | Silicone protective boots, padlockable shrouds, Ø22 blanking plugs | Flush vs extended head profile, IP65/IP67 sealing | Prevent accidental actuation, dust/oil ingress & open holes |
| Empty Stations | 1, 2, 3, 4, 5, 6-hole (Ø22 mm) plastic/die-cast enclosures | Cutout count, Yellow/Black (E-stop) vs Grey/Black cover | Build custom wall or machine-side operator control boxes |
Frequently asked questions
Are snap-on contact blocks interchangeable between different push button brands?
No. While the Ø22.5 mm panel hole is universal, the mounting adapter collar and contact block latches are proprietary to each manufacturer's pushbutton series.
What is the difference between front-mount and base-mount contact blocks?
Front-mount contact blocks clip directly onto the back of the actuator collar on a panel door, whereas base-mount blocks clip into the bottom of an empty pushbutton enclosure so wiring stays inside the box when the lid is removed.
How do I seal an unused Ø22.5 mm pushbutton hole on a control panel?
Install a gasketed Ø22 mm hole blanking plug (secured with a rear locking nut) to restore IP65 dust and moisture protection over spare cutouts.