Check the listing for details. Techna PtecMushK40 Key 40mm Emergency Stop Button Switch Plastic 10A 1NO-1NC. Color: Red, Condition: New, Made in China. Listed at 48.36 USD. Techna PtecMushK40 Key 40mm Emergency Stop Button Switch Plastic 10A 1NO-1NC Techna PtecMushK40 Key 40mm Emergency Stop Button Switch Plastic 10A 1NO-1NC £ 22.29 Ask a question 40mm emergency stop button key release switch manufactured by Techna featuring 1NO and 1NC contacts and a 'turn to release' actuator suitable for industrial applications. The switch features a plastic housing and is suitable for industry standard 22.5mm mounting. Button diameter: 40mm Plastic construction Supplied with mounting block Fits panel thickness 1-6mm 22.5mm diameter UL and CSA approved Rated insulation voltage: 500V Rated thermal current: 10A 1NO and 1NC contacts About Us Shop related items eBay & Ecommerce Stores By.