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The JSBT4 has two inputs, both of which have to be closed in order to keep the safety output contacts closed. A short circuit between inputs A and B will cause the output contacts to open. The inputs can be continuously short circuit without damaging the safety relay. For the outputs to close, the test input must be closed. The test input is intended to monitor that contactors or valves have dropped or returned before a new start is permitted.
This test input must not be confused with the reset function required for gates that a person can walk through and where there is a high safety requirement (see JSBR4). If the JSBT4 is used for Safety Mats and Safety Strips, the "stop" condition is given following detection of a short circuit. Neither the Safety Mat, Safety Strip or the relay will be damaged by a continuous short circuit. This also provides the advantage that if there is a failure between inputs A and B in the installation, the safety relay will not be damaged.
Safety Level
The JSBT4 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. Category 3 or 4 depending on use. The true two channel safety function has the advantage that the cabling installation demands for safety can be reduced due to the fact that a short circuit between the inputs will directly open the relays safety outputs.
Applications
- Emergency Stops
- Three Position Devices
- Interlocked Gates/Hatches
- Safety Mats
- Contact Strips
- Foot-Operated Switches
Features
- Dual channel input synchronism 0.5 s
- Test input
- Width 45 mmLED indication of power on, 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.  JSBT4 Safety Relay
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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 JSBT4 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.
Approvals
  
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JSBT4 Safety Relay
