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Terminal blocks provide easy connection of panel-mounted electronic components to device power and field wiring. A wide variety of modular terminal blocks are available in various styles and specialized purposes to make quick, clean, safe and efficient installations.
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Terminal Blocks
Category Selection
- Single-level Feed-through Terminal Blocks
- Double-level Feed-through Terminal Blocks
- Triple-level Feed-through Terminal Blocks
- Mini Terminal Blocks
- Common Point Terminal Blocks
- Grounding Terminal Blocks
- Circuit Protection Terminal Blocks
- Disconnect Terminal Blocks
- Plug-In Terminal Blocks
- Thermocouple Terminal Blocks
- Mini Supplementary Protectors
- Terminal Plugs
- End Brackets
- End Covers
- Separators
- Top Covers
- Jumpers
- Marking Tags
- Terminal Block Accessories
Terminal blocks are insulated modular blocks that connect two or more wires together. Basic terminal blocks consist of a wire clamping mechanism for each wire with a conductive metal strip between them. Terminal blocks provide secure connections, easier wire installation/removal, and better organization than other connection methods. Several varieties of terminal blocks are available, many for specific purposes, across the brand/series offered.
- Konnect-It screw-type terminal blocks offer cost-effective components that fit on a 35mm DIN rail (standard terminal blocks), or 15mm DIN rail (mini terminal blocks)
- DINnectors screw-type terminal blocks offer the most expansive selection of terminal block styles and connection options. They are internationally approved by national and international standards organizations such as UL, CSA, VDE, SEV, RINA and IEC.
- DINnectors screwless type terminal blocks use a spring clamping system for wire connection. They offer a quick and easy clamping system that is secure and maintenance free. Just push the spring clamp, insert the wire and release. This series offers a functional set of block types that support most applications.
Terminal blocks are sold in cost-saving multi-packs of up to 100, or in convenience packs of lower quantities, depending on part number.
For part listings and specifications, go to Shop Now
Single-level Feed-through Terminal Blocks
Single-level feed-through terminal blocks are the simplest type of terminal block, designed to support one input and one output connection. They are available in various colors, wire size options, and other features, depending on series.
- Konnect-It KN series screw type: up to 175A, wire sizes up to 2/0 AWG
- DINnectors DN series screw type: up to 185A, wire sizes up to 3/0 AWG
- DINnectors DN series screwless type: up to 45A, wire sizes up to 8 AWG
Double-level Feed-through Terminal Blocks
Double-level feed-through terminal blocks allow space savings by providing two independent connection terminals in a single block. They are available in various colors and wire size options, depending on series. Certain series are available with an optional LED indicator and other features.
- Konnect-It KN series screw type: up to 30A, wire sizes up to 10 AWG
- DINnectors DN series screw type: up to 30A, wire sizes up to 10 AWG
- DINnectors DN series screwless type: up to 20A, wire sizes up to 12 AWG
Triple-level Feed-through Terminal Blocks
Triple-level feed-through terminal blocks provide three connection terminals for even more space savings, available in various colors, wire size accommodation and other options, depending on series.
- Konnect-It KN series screw type: up to 24A, wire sizes up to 12 AWG
- DINnectors DN series screw type: up to 10A, wire sizes up to 14 AWG
Mini Terminal Blocks
Mini terminal blocks are used in areas with extremely limited space requirements and are only mountable on 15mm DIN rails.
- Konnect-It KN series screw type: up to 30A, wire sizes up to 10 AWG
- DINnectors DN series screw type: up to 10A, wire sizes up to 10 AWG
Common Point Terminal Blocks
Common point terminal blocks are designed for applications requiring multiple wires to be tied together. They are available in one-to-two or two-to-two configurations and utilize multiple spring clamps that are all connected to a singular internal conductive strip. LED and diode variations are also available.
- DINnectors DN series screwless type: up to 20A, wire sizes up to 12 AWG
Grounding Terminal Blocks
Grounding terminal blocks are used to electrically connect wires to the DIN rail by means of a conducting clamping foot. In this way, the DIN rail can function as a ground bus bar. Grounding terminal blocks offer low contact resistance, corrosion-free connection points, and feature an easily identified yellow-green colored housing.
- Konnect-It KN series screw type: wire sizes up to 8 AWG
- DINnectors DN series screw type: wire sizes up to 1/0 AWG
- DINnectors DN series screwless type: wire sizes up to 8 AWG
Circuit Protection Terminal Blocks
Circuit protection terminal blocks, sometimes referred to as fused terminal blocks, utilize replaceable fuses or circuit breakers/disconnects for the connection between the attached wires. Various models are available for fuses, circuit disconnects, or supplementary circuit breakers.
- Konnect-It KN series screw type: up to 6.3A, wire sizes up to 8 AWG
- DINnectors DN series screw type: up to 10A, wire sizes up to 6 AWG
Disconnect Terminal Blocks
Disconnect terminal blocks are a simple solution when the circuit wired to the terminal block needs to be opened on occasion for maintenance, etc. or to perform tests while the system is powered. Disconnection may be via moveable jumper bar or pivoting knife blade, depending on series.
- Konnect-It KN series screw type: up to 16A, wire sizes up to 8 AWG
- DINnectors DN series screw type: up to 25A, wire sizes up to 10 AWG
- DINnectors DN series screwless type: up to 20A, wire sizes up to 12 AWG
Plug-In Terminal Blocks
Plug-in terminal blocks support connectors/plugs (sold separately) that can be removed, wired with the desired connections, and inserted back into the terminal block.
- DINnectors DN series screw type: up to 12A, wire sizes up to 12 AWG
- DINnectors DN series screwless type: up to 12A, wire sizes up to 12 AWG
Thermocouple Terminal Blocks
Thermocouple terminal blocks are designed with only one screw clamp to provide suitable connections for thermocouple sensors. These clamping yoke terminal blocks will accept any type of thermocouple lead connection within their rated wire size range, providing excellent continuity without the need for any other compensation metals/contacts.
- DINnectors DN series screw type: 50V AC/DC or 300V ratings, wire sizes up to 18 AWG
Mini Supplementary Protectors
Mini supplementary protectors are used with select circuit protection terminal blocks to add supplementary protection to any circuit quickly and easily.
- 0.25 to 10A amperage rating
- UL 1077 single pole push ON, push OFF, push to reset versions
- For DINnectors screw-type terminal blocks
Terminal Plugs
Terminal plugs (aka terminal plugs) are used for plug-in terminal blocks to provide various terminal connections.
- Available with up to 12 terminal connections
- 300V / 12A rated
- Wire sizes 14 to 22 AWG
- For DINnectors screw-type and screwless terminal blocks
End Brackets
End brackets prevent terminal blocks and other DIN rail mount components and devices from moving laterally on the rail.
- Constructed from polyamide 66
- Available for 35mm and 15mm DIN rails, depending on series
- Available for Konnect-It and DINnectors series terminal blocks
End Covers
End covers are used to cover the open side of DIN-rail mounted terminal blocks, providing a protection barrier from potential electrical hazard. They should be used at the end of an assembly of identical terminal blocks or whenever there is a change in the physical size of the terminal block.
- Constructed from polyamide 66
- Selection of shapes and colors, depending on series
- Available for Konnect-It and DINnectors series terminal blocks
Separators
Separators are used to segment banks of terminal blocks, making it possible to maintain a single row of terminal blocks while having separate power source clusters.
- Selection of colors and dimensions, depending on series
- Available for Konnect-It and DINnectors series screw-type terminal blocks
Top Covers
Top covers snap on top of terminal blocks to prevent accidental contact with personnel or other equipment.
- Available in various designs with printed symbols or blank to allow labeling or marking, depending on series
- Available for Konnect-It and DINnectors series screw-type terminal blocks
Jumpers
Jumpers provide quick and easy connections between terminal blocks.
- Styles include screw-down connection or screwless comb-style jumpers
- Various pole quantities and configurations
- Available for Konnect-It and DINnectors series screw-type terminal blocks
Marking Tags
Marking tags provide identification of terminal blocks and wires. Tags are available either blank or in various preprinted designs.
- Available for Konnect-It and DINnectors series terminal blocks
Terminal Block Accessories
Terminal block accessories to aid in installation include:
- Label holders
- Disconnect knife blade inserts
- Wire tag holders
- A selection of special cutting pliers
- Terminator block tool kit
- Test plugs
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