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Noncontact Safety Interlock Switches

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About Noncontact Safety Interlock Switches

Noncontact safety interlock switches are machine safety products that provide a compact, non-contact way to interlock doors, guards, gates and covers. They are made of plastic or chemically-resistant steel and are designed to restrict or prevent access to a variety of hazards. Non-contact safety interlock switches use several types of contacts. Positive-break contacts are normally closed (NC) electrical contacts which, upon actuation, are forced open by a non-resilient, mechanical drive mechanism. In the event of a mechanical failure such as the breakage of a spring or weld, the contact point remains in an activated position. True spring-actuated safety interlock switches are not considered to be positive-break devices. Noncontact safety interlock switches with normally open (NO) contact pairs and pairs of changeover contacts are also available. Typically, changeover contacts are used in single-pole double-throw (SPDT) devices. 

Noncontact safety interlock switches consist of an actuator, one or more read heads, and a control unit that is connected to multiple power contactors. Each read head transmits an electrical signal or electromagnetic field to the actuator, which processes the data for transmission to the control unit. If the control unit recognizes the transmitted information, the safety outputs are closed. Each actuator includes a uniquely coded element that cannot be reprogrammed. Most control units provide external device monitoring (EDM) and can be operated in manual or automatic-start mode. Typically, a control unit manages two or four solid-state outputs and provides individual monitoring of each read head. For applications that require the guarding or more than four doors, control units are connected in series according to safety standards such as EN954-1. 

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Products & Services Related to Noncontact Safety Interlock Switches

Emergency Stop Switches
Emergency stop switches are devices that users manipulate to initiate the complete shutdown of a machine, system, or process.
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Intrinsic safety (IS) barriers are devices that limit the current, voltage, and total energy delivered to a sensor in a hazardous area or flammable environment in order to prevent an explosion.
Light Curtains
Light curtains are photoelectric transmitters that project an array of synchronized,parallel infrared light beams to a receiver unit. When an opaque object interrupts one or more beams, the light curtain controller sends a stop signal to the guarded machine. Light curtains are used as personal safety devices around hazardous machinery or for permiter guarding.
Mechanical Safety Interlock Switches
Mechanical safety interlock switches couple a moveable guard door with the power source of the hazard. When the guard door is opened, the power is isolated, ensuring that the machine does not pose a hazard while an operator requires access.
Pressure Sensitive Safety Edges and Safety Bumpers
Pressure-sensitive safety edges and safety bumpers are machine safeguarding devices that sense changes in pressure.
Safety Mats
Safety mats are presence-sensing devices used to guard a floor area around a machine or robot.
Safety Relays and Control Modules
Safety relays and control modules differ from conventional relays in that they have force-guided or positive-driven contacts.

Engineering Web: Noncontact Safety Interlock Switches

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Safety Switches: Overview
Non-Contact Interlock Safety Switches CM Series
See Omron Electronics LLC Profile & Catalog
Preventa? Non-Contact Safety Interlock Switches - Schneider...
XCS-DM non-contact safety interlock switches perform the same functions as standard mechanical safety interlock switches, but are designed to be used
Industrial Automation Engineering & Factory Systems | Omron...
Safety Interlock Switches Two hinged-operated safety interlock switches are suited for use on small guard doors.
See Control Design Information
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