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Safety interlocking in explosive atmospheres

28 April 2022

Fortress is a world-leading manufacturer in robust and configurable interlocks and has now launched a new range for use in explosive atmospheres called Alfred after the inventor of dynamite, Alfred Nobel.

Alfred is a range of robust and customisable interlocking solutions (also known as a safety switch, safety door lock, safety input or safety interlock) certified for safe use in explosive atmospheres and hazardous locations. The flameproof and IP69 enclosure guarantees safe use in the harshest safeguarding conditions to protect your people and productivity.



Fortress’ Ex rated interlock in use – the Alfred range


The Alfred range is certified to be used in explosive atmospheres and hazardous locations. The Alfred range has ATEX, IECEx, UKEx, CCCEx and North American HazLoc certificates. The range includes solenoid interlocks and switch interlocks suitable for up to Zone 1 (Gas) and Zone 21 (Dust) and atmosphere ignition temperatures of above 85°C. As well as non-electric trapped key interlocks that are suitable for any explosive atmosphere or hazardous location.


Key features include:


- Integrated restart prevention for up to three operators
- Certified to ATEX, IECEx, CCCEx, & North American standards
- Monitoring & guard locking devices for use in Zone 1/21
- Fully mechanical access devices for use in Zone 0/20 - Stainless Steel IP69 rated
- Approved for risks in your application that requires a PLe rating
- Third-party approved by TUV


We know how annoying it is when safety equipment breaks and production stops while you have to replace an interlock or rewire a safety relay. That's why Fortress' Interlocks and the Alfred range are made with an all-metal construction to ensure long-lasting use to prevent downtime on your site as much as possible.


Alfred's Trapped key products can enable interlocks to be used without the fear of electrical failure and mean you don't need a safety PLC or relay, saving costs in your overall system design.


Contact Fortress for help designing your safety system.


Learn more about the Alfred range here.




Fortress’ Alfred range of Interlocks for explosive atmospheres


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