Information about 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.

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.

Intrinsic Safety Barriers

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 - Machine Design

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