Safety relay modules use monitoring logic, circuit protection, and redundant relays to provide fail-safe operation. Positive guided contacts are reliable for safety applications. Relay modules are available in E-stop, two-hand, safety gate, safety mat, light curtain, and speed safety relay models.
Safety devices such as light curtains, safety mats, and E-stops are used to detect when a hazardous situation arises. To ensure the proper action is taken when these devices are triggered, a dependable control device is required. Safety rated PLCs are one option but can increase the cost and complexity of the safety circuit considerably. Safety relays are a better option for small or simple systems that have a few to a moderate number of safety devices.
Safety relays reliably monitor safety input devices and prohibit machine operation if any hazardous conditions are detected. Contrary to a standard electromechanical relay, safety relays employ various switching, protection, and alerting functions to ensure the safety circuit performs when it counts.
Whitepaper: When to Use Multi-Function Safety Relays
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Single-channel E-Stop safety relays are ideal for applications using manual E-stop buttons. A variety of control voltages and output configurations are available.
Two-channel E-Stop / safety gate relays are ideal for applications using manual E-stop button and safety gates with redundant circuits. Fixed- and multi-function relays are available.
E-Stop / safety gate time delay relays are ideal for applications using manual E-stop buttons or safety gate circuits where a contact release delay is required. Two-channel fixed and multi-function relays are available.
Two-hand safety control relays are ideal for operations where two separate pushbuttons are used to verify a safe state, typically on machinery with dangerous closing movements, ensuring hands are clear of any mechanisms. Two-channel fixed and multi-function relays are available.
Safety relays for light curtains offer capabilities such as release delay, muting, stepping, and protection for multiple curtains. Two-channel fixed and multi-function relays are available.
Safety relays for safety mats and edges offer manual or automatic restart. Single and two-channel fixed and multi-function relays are available.
Speed monitoring safety relays provide overspeed, underspeed or window monitoring for single or three-phase motors, by monitoring external proximity sensors mounted on a rotating element of the motor or load.
Frequency monitoring safety relays provide overspeed, underspeed or window monitoring for single or three-phase motors, by monitoring frequency of the motor power signal.
Motor standstill safety relays provide standstill detection for single or three-phase motors, by monitoring the remanence voltage (back EMF) of the motor signal.
Multifunction safety relays can be configured for a variety of applications, including E-stop, safety gate, two-hand control, safety mat, exclusive XOR contacts, or light curtain functions. Single or separately settable two-channel models are available.
Safety extension relays provide additional contacts for Emergency-stop relay modules, safety gate monitors, and safety controllers.
Force guided relays offer safe operation via mechanically linked contacts to ensure that all contacts move at the same time, and preventing movement if any contact is immobilized.
Warning: Machine safety products sold by AutomationDirect are safety components only.
The purchaser/installer is solely responsible for the application of these components and ensuring all necessary steps have been taken to assure each application and use meets all performance and applicable safety requirements and/or local, national and/or international safety codes as required by the application. AutomationDirect cannot certify that our products used solely or in conjunction with other AutomationDirect or other vendors products will assure safety for any application.
Any person using or applying any products sold by AutomationDirect is responsible for learning the safety requirements for their individual application and applying them, and therefore assumes all risks, and accepts full and complete responsibility for the selection and suitability of the product for their respective application.
AutomationDirect does not provide design or consulting services, and cannot advise whether any specific application or use of our products would ensure compliance with the safety requirements for any application.
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