WARNING: Not a Safeguarding Device
An Emergency Stop Device is not considered a safeguarding device because it requires an overt
action by an individual to stop machine motion or hazards.
(A safeguarding device limits or eliminates an individual's exposure to a hazard without action by the indi-
vidual or others.) Because an individual must actuate the device for it to function, these devices do not fit
the definition of a safeguarding device and cannot be substituted for required safeguarding. Refer to the
relevant standards to determine those requirements.
Emergency Stop Considerations
ANSI NFPA 79, ANSI B11.19, IEC/EN 60204-1, and ISO 13850 specify emergency stop requirements, including the following:
• Emergency-stop push buttons shall be located at each operator control station and at other operating stations where emergency
shutdown is required.
• Stop and emergency-stop push buttons shall be continuously operable and readily accessible from all control and operating stations
where located. Do not mute or bypass E-stop buttons.
• Actuators of emergency-stop devices shall be colored red. The background immediately around the device actuator shall be colored
yellow (where possible). The actuator of a push-button-operated device shall be of the palm or mushroom-head type.
• The emergency-stop actuator shall be a self-latching type.
WARNING: Emergency Stop Functions
Do not mute or bypass any Emergency Stop device. ANSI B11.19, ANSI NFPA79 and IEC/EN
60204-1 require that the Emergency Stop function remain active at all times.
WARNING: Multiple Switching Devices
Whenever two or more devices are connected to the same safety module (controller):
•Contacts of the corresponding pole of each switch must be connected together in series. Never
connect the contacts of multiple switches in parallel. Such a parallel connection defeats the switch
contact monitoring ability of the Module and creates an unsafe condition which could result in serious
injury or death.
•Each device must be individually actuated (engaged), then released (or re-armed) and the safe-
ty module reset. This allows the module to check each switch and its wiring to detect faults.
This check must be performed during the prescribed checkouts. Failure to test each device individually
in this manner could result in undetected faults and create an unsafe condition which could result
in serious injury or death.
Installation and Maintenance
The device must not be affected by environmental conditions. Install the device so that operation is not impeded, but should be
protected against inadvertent operation (for example, accidental actuation by being bumped or leaned against). Do not operate the
switch using a tool. Do not expose the switch to excessive shocks and vibrations, otherwise the switch may be deformed or damaged,
causing malfunction or operation failure. Hardware includes jam nut, lock washer, lock ring, and seal washer. The lock ring may be used
to prevent switch rotation if a 5mm hole keyway is provided.
Electrical installation must be made by qualified personnel and must comply with NEC (National Electrical Code), ANSI/NFPA 79 or
IEC/EN 60204-1, and all applicable local standards. It is not possible to give exact wiring instructions for a device that interfaces to a
multitude of machine control configurations. The following is general in nature; it is recommended to perform a risk assessment to ensure
appropriate application, interfacing/hookup, and risk reduction (see ISO 12100 or ANSI B11.0).
SSA-EB Series Lighted Emergency Stop Push Buttons
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