How to Choose Between Flat Raised and Mushroom Push Buttons
Flat, raised or mushroom: how head geometry decides glove fit, snag risk and legend readability, and which style belongs on which door of your control panel.
Blog
What AC-15 and DC-13 Mean on a Push Button Contact Block
What the AC-15 and DC-13 utilization categories mean on a 22 mm push button contact block, why thermal current is not a switching rating, and how contacts weld.
Replacing a Push Button Without Re-Drilling the Panel
How to measure an existing panel cut-out, handle the anti-rotation notch, check spacing and stack depth, and get a replacement push button right first time.
When a Push Button Tests Fine but the Machine Will Not Start
Why a contact that passes a continuity test still fails a PLC input, the minimum switching current problem, and when gold-plated contacts are the right answer.
Why a CT Secondary Must Never Be Left Open
What happens inside a current transformer when the secondary is left open, how it happens during meter swaps, and the shorting habit that prevents it.
How Many Temperature Points Does Your Switchgear Need
How to count temperature points on a switchgear lineup, pick battery or induction sensors, and set alarms that fire on differential rather than absolute heat.
What Harmonic Readings on a Power Meter Tell You
Why the third harmonic heats the neutral, how to read a spectrum instead of a single THD number, and the CT burden mistakes that make harmonic data wrong.
Indicator Light Selection: Reading the AD115 Model Code
Read the AD115 indicator light code field by field: 16, 22 or 25 mm mounting, AC or AC/DC supply, head style, colour coding, IP65 and the salt-spray option.