An emergency stop label looks simple until you read the standard and find the labelling rule runs the opposite way to what most people expect. The short version: a red e-stop actuator on a yellow background is the identifier all by itself, and the worded "EMERGENCY STOP" legend belongs on an adjacent plate — not crammed onto the button. This is the plain-English guide to e-stop identification under AS/NZS 4024, and how to get compliant engraved legend plates made.
AS/NZS 4024.1604:2019, "Safety of machinery — Emergency stop — Principles for design", is the standard that governs it. It's a modified adoption of ISO 13850:2015. The device-level requirements come from IEC 60204-1, adopted in Australia as AS 60204.1.
The red-on-yellow rule
This is the heart of e-stop identification. The emergency-stop actuator shall be red, and the background immediately behind or around it shall be yellow wherever a background exists and it's practicable to provide one. That red-on-yellow combination, on its own, means "emergency stop". It's recognisable with no text at all, in any language — which is exactly the point. A worker who can't read the panel can still find the e-stop.
The red actuator on a yellow background is the identifier. It works with no words, in any language, in a hurry. Everything else — text, symbols — is there to support it, not to replace it.
The labelling rule that catches people out
Here's the counter-intuitive bit, and it's worth getting exactly right. ISO 13850 and AS/NZS 4024 say the actuator and its yellow background should not be cluttered with text or symbols. The red/yellow combination is the identifier — piling words onto the button or its background works against that instant recognition.
So where does the worded "EMERGENCY STOP" legend go? On an adjacent legend plate, beside the device — not on the actuator or its background. Yellow plate with black "EMERGENCY STOP" text is the common format, and that's precisely what an engraved legend plate is for. If a symbol is used instead of (or alongside) text, it should be the standard IEC 60417-5638 emergency-stop symbol.
This is why you'll see worded e-stop labels everywhere and they're entirely correct — they just belong adjacent to the device, doing the supporting identification job, while the red button on yellow does the recognition job.
It's a small distinction with a real reason behind it. In an emergency, a worker is reacting in a fraction of a second, often without time to read. A clean red mushroom on a clear yellow field is unmistakable; a button covered in fine print is slower to find. The standard is protecting that split-second recognition. So when you spec a plate, think of it as the label for the e-stop, mounted beside it, rather than a label that sits over the actuator and competes with the colour that's doing the real work.
The e-stop device itself
Worth understanding the device, even though this article is about the identification plate rather than the button. A few points from the standard:
- Actuator types. The mushroom-head or palm pushbutton is the most common, but pull-wires and ropes, bars and foot-pedals are also permitted.
- Latching. The actuator must latch in the pressed position — it self-holds. Releasing the head must not reset the function; reset is a separate, deliberate action.
- Mounting height. Hand-operated actuators are typically mounted between 0.6m and 1.7m above floor level.
To be clear: this post is about identification and legend plates. The e-stop device, its wiring and its safety function are a separate matter for the machine designer and installer.
Sizing legend plates to the device
Standard control devices sit in a 22.5mm mounting family, so legend plates are sized to fit 22mm and 22.5mm devices. Engrave the legend exactly as specified — case matters. Common e-stop legend plate formats include oversized plates and the 60mm size, which give the worded legend room to read clearly beside the button.
Our Advanced Designer is built for exactly this. It has ready templates including circle and E-STOP layouts with curved text, and it adds custom shapes, mounting holes and cutouts, plus a warning-symbol and electrical-icon library. You can lay out the plate, drop in the cutout for the device, and run "EMERGENCY STOP" as curved text around the actuator opening.
Why engraved legend plates over printed stickers
A machine that runs for years is brutal on printed stickers — heat, coolant, handling and UV all conspire to fade and lift a printed e-stop label. An engraved legend plate doesn't have that problem. The legend is laser-cut into two-colour engraving laminate — a colour cap over a contrasting core — so the mark is the material. Yellow-cap laminate with the legend cut through to a black core gives you the standard yellow-with-black-text e-stop plate that reads the same in five years as on day one.
Stock colours cover it straight off the shelf — yellow/black for the e-stop legend, plus the rest of the safety palette for the wider panel. Fix the plates with self-adhesive backing or mounting holes to suit. For the broader control-panel labelling job, see our electrical labels, and for the material detail, traffolyte labels.
One honest note on outdoor or sun-exposed machines: the engraved legend can't fade because it's cut into the material, but the laminate substrate can chalk under years of direct sun. For long-term external exposure, ask about a UV-stable grade or a metal plate.
Made by a qualified electrician in Townsville and shipped Australia-wide, with 1–3 business day production and no minimum order. Lay out your e-stop legend plates in the label designer or the Advanced Designer, or call us on 0432 736 559 to talk it through.
References
- AS/NZS 4024.1604:2019 — Safety of machinery — Emergency stop — Principles for design (modified adoption of ISO 13850:2015)
- ISO 13850:2015 — Safety of machinery — Emergency stop function — Principles for design
- AS 60204.1 / IEC 60204-1 — Safety of machinery — Electrical equipment of machines (device requirements)
- IEC 60417-5638 — Standard emergency-stop graphical symbol
This article summarises publicly available guidance on emergency-stop identification and is not a substitute for professional advice or the direction of your machine designer, certifier or inspector. Always confirm the requirements against the current edition of the relevant standard before you fabricate or install.