Commoning Blocks

Commoning blocks are insulated modular parts that connect cables with equal electrical potential. These blocks are affixed to bases that connect them to DIN rail mountings. Each pole of the block is linked internally by a copper busbar, providing a low resistance connection path.

Commoning blocks have up to three connection levels, which allow for easy insertion of conductors. The connection bars are nickel plated to protect the component against corrosion.

What are commoning blocks used for?

Commoning blocks are often used in junction boxes, panel boards and equipotential earthing applications. They allow for the disconnection of branch wires without interrupting the main conductors and shutting down the circuit. They are typical in medical industries where potential (charge) equalisation is necessary to earth (ground) equipment and electrical instruments.

Types of commoning blocks

Commoning blocks come in a variety of types, with different physical attributes like pole length, size and number of poles. Blocks are categorised as double row, single pole, multi-pole or quick connect.

Commonning blocks are also distinguished by the level of potential they are compatible with in terms of voltage and ampere range.


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Description Price Number of Ways Wire Size Current Rating Rail Mounting Compatibility Termination Method Length Width Height Colour Voltage Rating Cable CSA Maximum Operating Temperature Series For Use With
RS Stock No. 388-2855
BrandRS Pro
TWD514
Each (In a Pack of 3)
units
12 10 → 5 AWG 100A - Screw Down 104.5mm 32.5mm 36.5mm Clear 450 V 6 mm², 16 mm² +85°C - -
RS Stock No. 880-6796
BrandRS Pro
TWD21
Each (In a Pack of 10)
units
- - - Yes - - - - Clear - - - - -
RS Stock No. 880-6815
BrandRS Pro
TWD22
Each (In a Pack of 10)
units
- - - Yes - - - - Clear - - - - -
RS Stock No. 880-6812
BrandRS Pro
TWD22
Each (In a Pack of 10)
units
- - - Yes - - - - Clear - - - - -
RS Stock No. 880-6809
BrandRS Pro
TWD22
Each (In a Pack of 10)
units
- - - Yes - - - - Clear - - - - -
RS Stock No. 880-6806
BrandRS Pro
TWD22
Each (In a Pack of 10)
units
- - - Yes - - - - Clear - - - - -
RS Stock No. 388-2861
BrandRS Pro
TWD442
Each (In a Pack of 3)
units
11 10 → 2 AWG 170A - Screw Down 58mm 43mm 42mm Clear 450 V 6 mm², 35 mm² +85°C - -
RS Stock No. 803-7805
Mfr. Part No.3210101
TWD48
Each (In a Pack of 50)
units
- - - - - - - - - - - - Clipline Modular Terminal Block
RS Stock No. 388-2833
BrandRS Pro
TWD337
Each (In a Pack of 3)
units
12 10 → 5 AWG 100A Yes Screw Down 104.5mm 50mm 42mm Clear 450 V 6 mm², 16 mm² +85°C - -