Emergency stop buttons fail to safe position
An
IDEC Electronics product story
Edited by the Engineeringtalk editorial team
Apr 1, 2004
The new concept XA and XW emergency stops ensure universal safety in all applications.
The new concept XA and XW emergency stops ensure universal safety in all applications.
The XA (16mm hole fixing) and XW (22mm hole fixing) have improved safety features over conventional emergency stops.
If the contact block is removed from the operator the main NC contact will be forced to open.
Also, on a conventional emergency stop when at the locked position, because of the internal spring pressure it can tend to move to the normal position if subject to excessive force or shock.
With the XA/XW it works the other way, the energy tends towards the safe off position.
If the contacts happen to be welded, the force applied to the button will always directly open the contact.
The XA and XW save space.
For example, the XA requires only 28mm behind the panel with four contacts fitted.
For those applications where operator safety is paramount, the 16mm XA (where space is a premium) and the 22mm XW (conventional and illuminated versions) must be considered.
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