Single Channel Safety Relay

The BT51 is designed to connect safety devices, such as emergency stops, directly in the voltage supply circuit to the relay. Despite a maximum built-in width of only 22.5 mm, the relay is very powerful. With 4 NO safety outputs, test input and complete internal supervising, the BT51 is quite unique. In addition you can order delayed outputs (BT51T).

In order for the safety outputs to close, the supply voltage, by means of an emergency stop button, must be connected to A1 and A2 and the test input closed. After actuation of the relay the test input can be opened again. The test input is intended to supervise that contactors or valves have dropped/returned before a new start can be permitted. The test input can also be used for starting and the start button can be supervised (see Connection Examples).

More Outputs

By connecting BT51 to a safety relay/PLC it is easy to increase the number of safe outputs. This means that an unlimited number of dangerous machine operations and functions can be stopped from one safety relay/PLC.

Safety Level

The BT51 has a twin and supervised internal safety function. Power failure, internal component faults or external interference cannot result in dangerous functions. Input via A1 only is not protected from short circuiting and therefore installation is critical for the safety level to be achieved. To achieve a higher safety level, a screened cable can be used and/or connection made to both A1 and A2

Features

• Width 22.5 mm
• LED indication
• 4 NO relay outputs
• Test/reset input
• 24 VDC
• Single or dual channel
• BT51 - Additional power terminals
• Quick release connector blocks
• BT51T - 1 changeover relay with a double information output (Y14)
• BT51T - Delay times selectable from 0 to 1.5s

For further information including technical data and connection examples click here. BT51/BT51T Safety Relay

BT51/BT51T 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.

Applications

• Emergency Stops
• Interlocked Hatches
• Expansion of Pluto Outputs

Regulations and Standards

The BT51 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