JSBR4 Safety Relay

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 or 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.

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).

Applications

Two-Handed Devices of Type lllc
Emergency Stops
Three Position Devices
Interlocked Gates/Hatches
Safety Mats
Contact Strips
Foot-Operated Switches

Features

Dual input channels synchronism 0.5s
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

For further information including technical data and connection examples click here. JSBR4 Safety Relay

If you're using Safety Relays, check out the Vital 1 Controller. Vital can monitor up to 30 Safety Devices and maintain Category 4 Safety Level.

Regulations and Standards

The JSBR4 is designed and approved in accordance with appropriate directives and standards. Examples of such are: 98/37/EC, EN ISO 12100-1/-2, EN 60204-1 and EN 954-1/EN ISO 13849-1.

The JSBR4 complies with the highest safety level for connection of a two-hand control device of type IIIc in accordance with EN574.