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What is the difference between Emergency stop with trigger action and mechanical latching & that of mechaniacl latching only?


The operator is emergency stop trigger action and mechanical latching pushbutton conforming to standard EN/ISO 13850 - Safety of machinery Emergency stop and to Machinery Directive 2006/42/EC.
While the operator is emergency switching off with mechanical latching pushbuttons conforming to standard IEC 60364-5-53 Electrical installations of buildings.

a) Emergency switching-off with mechanical latching
These have direct opening action.
The speed of opening of the NC contacts, and therefore the generation of the OFF command, is dependent on the speed with which the button is pressed.
The OFF command can (under some circumstances) be generated before the latching mechanism has operated, that is a momentary OFF command can be generated without the mechanism latching.

b) Emergency stop with trigger action and mechanical latching.
These also have direct opening action. The opening of the NC contacts, and the operation of the latching mechanism, are independent of the speed with which the button is pressed.
Stored energy in a spring is used to operate both the latching mechanism and the opening of the NC contacts, so that the mechanism cannot latch without the OFF command being generated, and cannot generate the OFF command without latching the mechanism.
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