Information about Safety Relays and Control Modules

Safety relays and control modules differ from conventional relays in that they have force-guided (positive-driven) contacts. Three relays are used in a safety relay module. One relay checks the condition of the other two and signals a failure. In addition, safety relays and control modules may be configured as either a single channel or dual channel. Single channel safety relays are capable of accepting only one normally closed (NC) input. When used in safety circuits, they are unable to detect a short circuit failure or a failure of the monitored input to change state. Dual channel safety relays ensure safety system integrity even if one logic circuit fails.

Products & Services Related to Safety Relays and Control Modules

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.

Noncontact Safety Interlock Switches

Noncontact safety interlock switches couple a moveable guard door with the power source of the hazard. For noncontact actuating interlock switches, the guard door is linked to the control circuit contacts via a magnetic or electronic field.

Safety Edges and Safety Bumpers, Pressure Sensitive

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.