Safety relays

The Sentry safety relays are powerful and easy to use safety relays, suitable for all common types of safety applications.

The Sentry series contains basic models for simple applications and easy output expansion, as well as highly flexible models with extremely accurate timer functions.

Sentry safety relays are used in both simple and more advanced safety solutions when safety devices need to be monitored according to the requirements of functional safety standards.

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Highlights

04/27/2022

OCB sensor connection block

Leaflet

Simplifying your sensor connection for OSSD and voltage free safety sensors

10/23/2021

Sentry push-in terminals

Faster installation and no retightening of terminals required.

04/12/2019

Sentry and Eden

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The perfect solution for monitoring doors and hatches on dangerous machinery.

06/02/2017

How to configure Sentry safety relays

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10/26/2022

Sentry connection diagrams

Leaflet

A collection of all available connection diagrams for Sentry

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Advantages

Applications

Features

Selection table

Continuous operation	Speed up your projects	Easy to install
LEDs and display 3-color LEDs allow for more status messages and simplify troubleshooting. Models with display offer preset configurations and extensive fault information.	Twice as fast to install Compared to regular spring loaded terminals that requires a screwdriver to release the spring before inserting cable.	Detachable terminal blocks Detachable terminal blocks speed up connection and replacement.
Advanced timer functions Timer functions with an accuracy of ± 1% minimize unnecessary downtime.	Ferruled or rigid cables Both ferruled and rigid cables can be connected by just pushing them into the opening.	Switch for reset selection Manual or automatic reset easily selectable by switch.
Multi-reset The multi-reset function enables reset of up to 10 Sentry safety relays using just one reset button.	No tools required No tools are required for installing cables.	Powerful outputs Powerful outputs allow to drive larger contactors and simplify installation by saving the use of an intermediary contactor..
Vibration resistant connectors Push-in terminals guarantee correct fastening and give a maintenance free connection.		Push-in terminals Intuitive push-in connection simplifies installation.

Monitoring of safety devices Sentry safety relays make it easy to reach the required level of safety when monitoring safety devices like emergency stop buttons, door switches, light guards, etc.	Expansion of safety outputs Sentry expansion modules are used to increase the number of safety outputs of a safety control module in order to control more machinery.	Timer functions Sentry timer relays have advanced and precise timer functions for use in On/Off-delay, time bypass and time reset.

Timer functions with an accuracy of ± 1% Several timer functions are available: On/Off-delay, time bypass and time reset. On/Off-delay are used to postpone the activation/deactivation of the safety outputs with a preset time delay. This is used in e.g. Category 1 stops	Configurable models with display The models with display are configurable and the user can choose between preset configurations and a custom configuration that can be protected by password.
Time bypass activates the safety outputs for a maximum predefined time when the safety inputs are closed. Inching is an example of application.	Faster troubleshooting with display The display minimizes troubleshooting by giving extensive information about internal faults, I/O faults, system faults, function faults and a log of the last 10 errors
Time reset activates the safety outputs for a maximum predefined time when the safety inputs are opened. Pre-reset is an example of application. An accuracy of ± 1% allows a very precise time to be set in order to increase safety and minimize unnecessary downtime.
	Switch for selection of the reset function All models can be used in automatic reset and some models allow to choose manual reset, either by switch or by configuration, which simplifies connection. In order to prevent mistakes, it is not possible to change reset function during operation by just flipping the switch.
	Push-in terminals Spring loaded push-in terminals simplifies and minimizes installation time, and eliminates the need for retightening connections after transportation or in an application with vibrations.
Multi-reset The multi-reset function enables reset of up to 10 Sentry safety relays using just one reset light-button. This simplifies connection, minimizes cabling and unnecessary downtime. The multi-reset function is available for all +24 VDC Sentry models offering manual reset	Powerful outputs The outputs have a switching capacity of up to 6A DC-13. This allows Sentry to drive larger contactors and saves the use of an intermediary contactor.
Light-button function The light-button function is used for the multi-reset function, but can also be used for a standard reset button. The function of the LED in the light-button is the following: on - at least one input is not accepted flashing - all inputs are accepted, reset possible off - all inputs accepted, reset performed, outputs active	Delayed outputs Some Sentry models have delayed outputs in order to e.g. give a machine time to apply breaking force before power is disconnected. For models with 2 NO + 2 NO outputs, it is only the second pair of NO outputs that is delayed. For models with 3 NO + 1 NC, all outputs are delayed.
Note: if an input is accepted it means that the door is closed, the light curtain is not interrupted, etc.	Single function or universal models Sentry SSR models are single function safety relays designed for a specific application such as 1 and 2 channel devices, OSSD devices or two-hand devices. Sentry USR models are universal safety relays. They are capable of handling most types of applications and safety devices, i.e. 1 and 2 channel devices, OSSD-devices, two-hand devices and contact mats/bumpers/edges. This means that only one type of relay is necessary as a spare, which reduces stock and saves warehouse space.