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Normally Open Contacts:

Normally Closed Contacts:

Changeover Contacts:

Positive Break Contacts?

Maximum Current:

Maximum AC Voltage:

Maximum DC Voltage:

Sensing (Make) Range:

Break Range:

Features:

Operating Temperature:

Allow up to: overrange/margin
Use the overrange/margin to restrict your search to items whose full-scale range is close to your requirements.
(Overrange/margin requires both 'From' and 'To' values to work.)

Help with Noncontact Safety Interlock Switches specifications:

Switch Specifications
   Normally Open Contacts       A normally open switch is a relay contact pair that is open when the coil is not energized. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Normally Closed Contacts       A normally closed switch is a relay contact pair that is closed when the coil is not energized. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Changeover Contacts       Changeover, Typically Form C (SPDT) 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Positive Break Contacts?       Also called positive opening contacts. The contact point opens reliably and remains open in activated position even in the event of mechanical failure, such as breakage of a spring or contact welding. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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Electrical Switch Specifications
   Maximum Current         
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Maximum AC Voltage         
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Maximum DC Voltage         
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
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Sensing / Break Range
   Sensing (Make) Range       The distance between the actuator and the sensing head to safely activate the relay outputs. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Break Range       The distance between the actuator and the sensing head to ensure relay outputs are safely deactivated. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Features
           
   Your choices are...         
   Control Unit       Integral control unit for monitoring multiple switches. 
   Emergency Override       Locking mechanism can be overridden in emergency situations by using either a tool or an override key. 
   Explosion Proof         
   Hermetically Sealed         
   Magnetically Coded Actuator       Actuation by a specific (coded) magnetic field array matched to the circuit’s reed array pattern. 
   Manual Time Delay       Time delay is used to protect an area where the hazard remains for a time even after the machine control has been turned off. 
   Tamper Resistant       Protection against unauthorized adjustment or circumvention. Not easily bypassed. 
   Visual Indicator       Contains an integral visual indicator such as an LED. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Environment
   Operating Temperature:       The temperature range over which the device must operate. 
   Search Logic:      User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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