TB12

What does this terminal block do?

This terminal block is used to wire compatible B&R X20 24 VDC modules. It provides a detachable connection point between field wiring and the module, helping make installation and replacement more straightforward.

How many connections does it provide?

It provides 12 pins in a compact X20-format terminal block. In the B&R range, the X20TB12 is the 12-pin option intended for applications that need more connection points than the 6-pin version.

Is it a push-in terminal design?

Yes. It uses push-in terminal technology, so conductors can be inserted without specialised tooling for the connection itself. Wires can then be released using the integrated lever.

Do I need any special tools to wire it?

No special connection tool is required for normal wiring. The design supports tool-free push-in termination, which can help speed up panel assembly and routine module changes.

What wire sizes can be used with it?

It accepts solid wires from 0.08 to 2.50 mm², fine-strand wires from 0.25 to 2.50 mm², and wires with end sleeves from 0.25 to 1.50 mm². Double wire end sleeves can be used up to 2 x 0.75 mm².

How much insulation should be stripped from the wire?

The recommended stripping length is 7 to 9 mm. Keeping within that range helps achieve a secure connection in the push-in terminals.

Can ferrules be used with this terminal block?

Yes, ferrules can be used. For the best cable retention, the ferrule should be fully inserted, not cut shorter, and should not have stray strands protruding from the end.

Is it possible to label the terminals?

Yes. Each terminal can be labelled, and plain-text labelling is also possible. This is useful where clear identification is needed during panel build or later inspection.

Can it be coded to prevent incorrect installation?

Yes. The terminal block can be customer-coded, and it is also described as 24 VDC keyed. This helps reduce the chance of mismatching terminal blocks and modules within an X20 assembly.

Can test probes be used on the terminals?

Yes. Each contact includes an additional opening for test access, suitable for standard probes up to 2 mm in diameter.

What are the electrical ratings?

The terminal block is rated for a nominal voltage of 240 VAC, with a maximum voltage of 300 VAC, and a nominal current of 10 A per contact. The limits of the connected I/O module should also be taken into account.

What type of wire material is suitable?

Only copper conductors should be used. Aluminium wires are not specified for use with this terminal block.

What ingress protection and approvals does it have?

It is rated IP20 and carries approvals including CE and cULus. It is also listed for ATEX Zone 2 applications under the stated conditions in the manufacturer documentation.

Where is this terminal block typically used?

It is typically used in B&R X20 automation systems, especially where compact modular I/O or controller assemblies require a detachable 12-pin field wiring connection. It is also supplied with certain B&R X20 CPU assemblies that use a TB12 terminal block.