JSBR4 Safety Relay
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A Universal Relay for Various Safety and Two-Handed Devices
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The JSBR4 has two inputs, which both have to be closed to keep the safety output contacts closed. A short circuit across the inputs will cause the output contacts to open. The inputs can however be subjected to a continuous short circuit without damaging the safety relay.
In order to make the safety outputs close the reset input must be closed and opened. In this way an unintentional reset is prevented in the case of a short circuit in the reset button cable or if the button gets jammed in the actuated position. The reset input can also be used for test/supervision to ensure that contactors or valves have returned to their initial off "stop" position before a new start can be allowed by the safety relay.
When the JSBR4 is used as a Two Hand relay both buttons have to be pressed within 0.5 seconds of each other in order to close the outputs.
When the JSBR4 is used for Safety Mats and Safety Strips the 'stop' condition is given following detection of a short circuit between input channels A and B. Neither the safety mat, safety strip or the relay will be damaged by a continuous short circuit. This also gives the advantage that if there is a failure between the inputs in the installation, the safety relay will not be damaged.
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Applications:
- Two-Handed Devices of Type lllc
- Emergency Stops
- Three Position Devices
- Interlocked Gates/Hatches
- Safety Mats
- Contact Strips
- Foot-Operated Switches
Features:
- Dual channel input
- Supervised reset
- Test input
- Width 45 mm
- LED indication of supply, inputs and outputs
- 3 NO/1 NC relay outputs
- 24 VDC
- 24, 48, 115 or 230 VAC
- Quick release connector blocks
Safety Level
The JSBR4 has a twin supervised safety function. Neither component failure, short circuit or external disturbances (power loss, etc.) will prevent the safe function of the relay. This is valid both for the inputs A and B as well as for the reset input. The JSBR4 operates at the highest safety level for safety relays (category 4).
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Regulations and Standards
The JSBR4 is designed and approved in accordance with appropriate standards. Examples of such are: EN 292-1/2, EN 60204-1, EN 954-1.
The JSBR4 complies with the highest safety level for connection of a two-handed control device of type IIIc in accordance with EN574.
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Connection Examples
For examples of how our safety relays can solve various safety problems, please see the page of "Connection Examples".
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Approvals
   
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