Last Updated: November 6, 2024 Reviewed by: Scott Orlosky, consulting engineer
Description
UL Listed terminal blocks are electrical connectors that are certified by Underwriters Laboratories (UL) to meet specific safety and performance standards. These terminal blocks are designed to connect electrical components in a safe and reliable manner, ensuring compliance with stringent regulatory requirements. They are commonly used in various industrial and commercial applications to provide organized, clean, and professional-looking control panels.
Working Principle
The primary function of UL Listed terminal blocks is to facilitate the connection of electrical wires in a secure and efficient manner. They achieve this by using various termination methods such as screw clamps, which tighten the wire to make an electrical connection. This ensures a reliable and stable connection, reducing the risk of loose or exposed wires that could lead to electrical faults or hazards. Terminal blocks can be mounted on DIN rails, screwed into panels, or placed on printed circuit boards (PCBs), depending on the specific application requirements.
Applications
UL Listed terminal blocks are widely used in industrial control cabinets, power distribution systems, and various types of electrical panels. They are essential for organizing and managing complex electrical systems, making it easier to troubleshoot and maintain the system. Specific types of terminal blocks, such as I/O blocks, sensor/actuator blocks, and power distribution blocks, are used to connect different types of devices and components, including proximity sensors, photoelectric sensors, and power cables.
Advantages
One of the main advantages of UL Listed terminal blocks is their ability to provide a safe and reliable connection for electrical components. They help in organizing electrical systems, making them easier to manage and maintain. The use of different housing colors and marking tags aids in the identification of specific circuits, further enhancing the ease of troubleshooting. Additionally, the certification by UL ensures that these terminal blocks meet high safety and performance standards, providing peace of mind to users.
Limitations
While UL Listed terminal blocks offer numerous benefits, they also have some limitations. For instance, the initial installation can be time-consuming, especially in complex systems with numerous connections. Additionally, the cost of UL Listed terminal blocks may be higher compared to non-certified alternatives, which could be a consideration for budget-conscious projects. However, the long-term benefits of safety and reliability often outweigh these initial drawbacks.
Considerations
When selecting UL Listed terminal blocks, it is important to consider factors such as the type of termination method, mounting options, and the specific requirements of the application. The choice of terminal block should align with the electrical specifications and environmental conditions of the system. Additionally, it is crucial to ensure that the terminal blocks are compatible with other components in the system to avoid any potential issues during installation and operation.
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Supplier: NSI Industries LLC
Description: STANDARD TYPE 22 AWG TO (2) 12 AWG WIRE SIZE UL APPROVAL DIN RAIL MOUNTING 15 AMPERE CURRENT RATING SNAP ON TERMINAL TYPE 1 CIRCUIT(S)
- Approvals: UL Listing Mark
- Conductor Size (North American): 12 to 22 AWG
- Current Rating: 15 amps
- Mounting Options: PCB Terminal Block, Other
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Supplier: NSI Industries LLC
Description: BLACK COLOR 1.5 INCH BLOCK WIDTH 2 TO 14 AWG WIRE SIZE UL APPROVAL 600 V VOLTAGE RATING 75 AMPERE CURRENT RATING 150 DEG C TEMPERATURE RATING THERMAL PLASTIC HOUSING MATERIAL 3 CIRCUIT(S) TERMINAL BLOKS
- Approvals: UL Listing Mark
- Conductor Size (North American): 2 to 14 AWG
- Current Rating: 75 amps
- Mounting Options: PCB Terminal Block
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Supplier: NSI Industries LLC
Description: BLACK COLOR 1.5 INCH BLOCK WIDTH 2 TO 14 AWG WIRE SIZE UL APPROVAL 600 V VOLTAGE RATING 75 AMPERE CURRENT RATING 150 DEG C TEMPERATURE RATING THERMAL PLASTIC HOUSING MATERIAL 2 CIRCUIT(S) TERMINAL BLOKS
- Approvals: UL Listing Mark
- Conductor Size (North American): 2 to 14 AWG
- Current Rating: 75 amps
- Mounting Options: PCB Terminal Block
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Supplier: NSI Industries LLC
Description: STANDARD TYPE WHITE COLOR 0.375 INCH BLOCK WIDTH 8 AWG STRANDED WIRE SIZE UL APPROVAL 600 V VOLTAGE RATING DIN RAIL, PANEL MOUNTING 50 AMPERE CURRENT RATING THERMAL PLASTIC HOUSING MATERIAL PLATE WITH SCREW TERMINAL TYPE OVERALL DIMENSION 1.75 INCH L X 1.625 INCH H DRTB MODEL
- Approvals: UL Listing Mark
- Conductor Size (North American): 8 AWG
- Current Rating: 50 amps
- Mounting Options: Panel Mount, PCB Terminal Block
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Supplier: Altech Corp.
Description: FEATURES Spring Clamp Technology CXVF: Accepts 5x20, 5x25 or 6.3x32mm Fuse types CXVF2.5: Accepts 5x20, 5x25 or 6.3x32mm Fuse types, 1 Input – 2 Outputs CXAF4/3: Accepts Automotive ATO Fuse APPLICATIONS Control systems with Fuse Protection Disconnect Applications
- Approvals: UL Listing Mark, Other
- Conductor Size (North American): 10 to 24 AWG
- Current Rating: 10 amps
- Number of Contacts: 2
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Supplier: OMEGA Engineering, Inc.
Description: necessary, even for stranded wire. A full line of accessories are available including end plates, end brackets, cross connectors for bridging and marking tags. The AVK terminal block plastic housing is made from polyamide 6.6 thermoplastic resin with a UL 94 V2 rating for 105°C.
- Approvals: CE Conformity Marks, CSA Mark (US, C and US, NRTL/C), UL Listing Mark, UL Recognized Component Mark (US and Canadian), VDE Component Mark, Other
- Conductor Size (North American): 0.0 to 26 AWG
- Current Rating: 20 to 192 amps
- Mounting Options: Universal Mounting Foot (Rail)
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Supplier: L-com, Inc.
Description: UL® Listed Enclosures... The NB141207-100T-UL is approved and listed with UL, meeting the stringent requires for Communication Enclosure System 40XX. The UL listing number is E326684. Use this enclosure when UL Listed products are
- Depth: 7 inch
- Length / Height: 14 inch
- Width/Diameter: 12 inch
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Supplier: OMEGA Engineering, Inc.
Description: The XB Series offers a complete terminal block system with a universal range of accessories. Marking, bridging and testing accessories are standardized across the different clamping technologies reducing inventory and logistics costs. The modular terminal block design
- Approvals: CE Conformity Marks, UL Listing Mark, UL Recognized Component Mark (US and Canadian), Other
- Conductor Size (North American): 0.0 to 26 AWG
- Current Rating: 20 to 150 amps
- Mounting Options: Universal Mounting Foot (Rail)
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Supplier: Altech Corp.
Description: FEATURES Screw Clamp Technology Universal Push-In Jumper System Snap-On Ground Blocks Additional Center Marking Area CYDL Series Multi-Function Terminal Blocks for more design options
- Approvals: UL Listing Mark, Other
- Conductor Size (North American): 10 to 24 AWG
- Current Rating: 10 amps
- Number of Contacts: 4
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Supplier: OMEGA Engineering, Inc.
Description: The XB Series offers a complete terminal block system with a universal range of accessories. Marking, bridging and testing accessories are standardized across the different clamping technologies -- reducing inventory and logistics costs. The modular terminal block design
- Approvals: CE Conformity Marks, UL Listing Mark, Other
- Conductor Size (North American): 4 to 28 AWG
- Current Rating: 20 to 125 amps
- Mounting Options: Universal Mounting Foot (Rail)
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Supplier: OMEGA Engineering, Inc.
Description: The superior design of the Insulation Displacement Connection (IDC) technology terminal blocks reduces wiring installation time and labor, especially in high-volume applications. IDC terminal blocks are suited for applications in automated equipment and machine tools,
- Approvals: CE Conformity Marks, UL Listing Mark, Other
- Conductor Size (North American): 10 to 26 AWG
- Current Rating: 10 to 24 amps
- Mounting Options: Universal Mounting Foot (Rail)
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Supplier: Altech Corp.
Description: FEATURES 2 connection grounding terminals Yellow/ Green Color as per Industry standard Snap-on feet APPLICATIONS Grounding Applications
- Approvals: UL Listing Mark, Other
- Conductor Size (North American): 6 to 24 AWG
- Number of Contacts: 2
- Terminal Block Type: Ground Circuit Terminal
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Supplier: Altech Corp.
Description: FEATURES 3 to 4 connections Up to 2 connection points on each side 2 jumper channels for individual potential distribution APPLICATIONS Connecting different type of wires with different wire sizes into single Terminal Block Simple distribution applications
- Approvals: UL Listing Mark, Other
- Conductor Size (North American): 10 to 24 AWG
- Current Rating: 30 to 32 amps
- Number of Contacts: 4
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Supplier: Eaton Corporation
Description: SWITCH TYPE 2 INCH W X 2.75 INCH H SIZE 18 TO 8 AWG WIRE SIZE UL APPROVAL 600 V VOLTAGE RATING DIN RAIL MOUNTING 15 AMPERE CURRENT RATING NYLON HOUSING MATERIAL NEMA CONSTRUCTION STANDARD NO INDICATOR TYPE STANDARD PACKAGE 10 C381 MODEL
- Approvals: UL Listing Mark
- Conductor Size (North American): 8 to 18 AWG
- Current Rating: 15 amps
- Mounting Options: Other
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Supplier: Mersen
Description: The Next Generation Power Distribution Block (PDB). Mersen power distribution blocks provide a safe and easy method of splicing cables, splitting primary power into secondary circuits and fulfilling requirements for fixed junction tap-off points. All blocks are UL and CSA
- Approvals: CSA Mark (US, C and US, NRTL/C), UL Listing Mark, Other
- Current Rating: 65 to 2260 amps
- Operating Temperature: 80 C
- Terminal Block Type: Power Distribution Block
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Supplier: Eaton Corporation
Description: FUSE TYPE 2 INCH W X 2.75 INCH H SIZE 18 TO 8 AWG WIRE SIZE UL APPROVAL 600 V VOLTAGE RATING NEMA RAIL MOUNTING 30 AMPERE CURRENT RATING NYLON HOUSING MATERIAL SCREW TERMINAL TYPE FERRULE, 0.406 INCH X 1.5 INCH FUSE PROVISION NO INDICATOR TYPE STANDARD PACKAGE 10 C381 MODEL
- Approvals: UL Listing Mark
- Conductor Size (North American): 8 to 18 AWG
- Current Rating: 30 amps
- Mounting Options: Other
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Supplier: Mersen
Description: FSPDBs introduce a new level of safety and ease for installing power distribution blocks. An IP20 level of finger safe protection is achieved using the FSPDBs and thus eliminates the need for special covers or custom Plexiglas sheets to protect your panels. FSPDBs (sizes 1 to 4) simply snap
- Approvals: CE Conformity Marks, CSA Mark (US, C and US, NRTL/C), UL Listing Mark, Other
- Current Rating: 175 to 840 amps
- Mounting Options: Other
- Operating Temperature: 80 C
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Supplier: LMI Components, Inc.
Description: PLUGGABLE TERMINAL BLOCKS
- Approvals: UL Listing Mark
- Contacts Pitch: 8.8 mm
- Current Rating: 30 amps
- Mounting Options: PCB Terminal Block
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Supplier: LMI Components, Inc.
Description: PLUGGABLE TERMINAL BLOCKS
- Approvals: UL Listing Mark
- Conductor Size (North American): 14 to 24 AWG
- Contacts Pitch: 3.81 mm
- Current Rating: 8 amps
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Supplier: LMI Components, Inc.
Description: PLUGGABLE TERMINAL BLOCKS
- Approvals: UL Listing Mark
- Conductor Size (North American): 12 to 30 AWG
- Contacts Pitch: 10 mm
- Current Rating: 12 amps
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Supplier: LMI Components, Inc.
Description: PLUGGABLE TERMINAL BLOCKS
- Approvals: UL Listing Mark
- Conductor Size (North American): 14 to 22 AWG
- Contacts Pitch: 5.08 mm
- Current Rating: 10 amps
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Supplier: LCSC Electronics Technology (HK) Limited
Description: 22~28 0.08~0.3 UL , RoHS , HF - Line Pressing Terminals ROHS
- Approvals: UL Listing Mark, Other
- Conductor Size (North American): 22 to 28 AWG
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Supplier: Schneider Electric, Automation & Control
Description: The complete ranges of Linergy TR (DIN rail Terminal blocks) and Linergy TB (Earth and neutral bar) bring simplicity of use to your installation. Linergy TB : Quick-clamp and screw-type solutions for ground and neutral cabling. Large choice of lengths for fitting to your enclosure
- Approvals: CSA Mark (US, C and US, NRTL/C), UL Listing Mark, Other
- Current Rating: 22 to 24 amps
- Mounting Options: Universal Mounting Foot (Rail)
- Operating Temperature: -40 to 130 C
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Supplier: Transtector Systems, Inc.
Description: protection from the outdoors. This NEMA waterproof cabinet enclosure has an IP66 rating. Industrial weatherproof outdoor NEMA IP66 enclosure TEF141207-100T-UL is built with 120V AC powered terminal block. TEF141207-100T-UL outdoor IP66 NEMA 4 enclosure cabinet datasheet
- Depth: 8.26 inch
- Features: Hinged Cover, Locking
- Ingress Protection(IP) Rating Against Foreign Objects: Type 6
- Ingress Protection(IP) Rating Against Moisture: Type 6
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Supplier: VAST STOCK CO., LIMITED
Description: Fixed Terminal Blocks MKKDSH 3/ 2 BK
- Approvals: UL Listing Mark, VDE Component Mark, Other
- Contacts Pitch: 5 mm
- Current Rating: 24 amps
- Mounting Options: PCB Terminal Block
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Supplier: TelephoneStuff.com
Description: Provides a convenient way to attach ground wires to racks or cabinets using (1) #12-24 screw (not included). Holds up to (2) #4 gauge wires. Features: - Zinc plated - UL Listed - One hole block
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Supplier: Marathon Special Products
Description: " BARRIER, STANDARD TYPE THERMOPLASTIC MATERIAL 14 TO 6 AWG (COPPER) WIRE SIZE UL 512, CSA, CE APPROVAL 2 POLE(S) BOX LUG TERMINAL TYPE CLASS R FUSE TYPE 30 AMPERE FUSE CURRENT RATING 250 V FUSE VOLTAGE RATING REINFORCED CLIP TYPE MARATHON. BRAND CLIP MATERIAL TIN PLATED COPPER ALLOY
- Approvals: CE Conformity Marks, CSA Mark (US, C and US, NRTL/C), UL Listing Mark
- Conductor Size (North American): 6 to 14 AWG
- Current Rating: 30 amps
- Mounting Options: Terminal Strip
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Supplier: BlockMaster Electronics, Inc.
Description: BlockMaster Electronics offer Screwless Terminal Blocks. These products are what they sound like – screwless! No screwdriver is needed for wire termination. These terminal blocks have a button, lever, slide, and poke-home versions that have a variety of
- Approvals: CE Conformity Marks, UL Listing Mark, UL Recognized Component Mark (US and Canadian)
- Contacts Pitch: 5 mm
- Current Rating: 10 amps
- Mounting Options: PCB Terminal Block
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Supplier: Weidmuller
Description: Weidmüller tension clamp connections - simple, quick and proven reliable: The universal screw-free connection with steel spring – ideal for PCB installation terminals. Wiring with demanding requirements for cost-effective connections with contact stability
- Approvals: UL Listing Mark
- Conductor Size (North American): 14 to 26 AWG
- Contacts Pitch: 5 to 10 mm
- Current Rating: 15 amps
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Supplier: Greaves Corporation
Description: MODULAR TYPE 4 INCH L X 1.7 INCH W X 2.6 INCH H SIZE COPPER/ALUMINUM CONDUCTOR MATERIAL UL APPROVAL 600 VAC VOLTAGE RATING 319 AMPERE CURRENT RATING SPD CM, CLEAR POLYCARBONATE COVER TYPE 90 DEG C TEMPERATURE RATING
- Approvals: UL Listing Mark
- Current Rating: 319 amps
- Operating Temperature: 90 C
- Terminal Block Type: Power Distribution Block
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Supplier: Hubbell Incorporated
Description: 1-PIECE TYPE 2-3/32 INCH L SIZE UL APPROVAL 600 V VOLTAGE RATING SURFACE MOUNTING 30 AMPERE CURRENT RATING NO COVER TYPE PHENOLIC HOUSING MATERIAL #10 STUD TERMINAL TYPE 2 CIRCUIT(S) NUMBER OF CIRCUITS 2
- Approvals: UL Listing Mark
- Current Rating: 30 amps
- Mounting Options: Terminal Strip
- Terminal Block Type: Single Feed Through
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Supplier: Radwell International
Description: TERMINAL BLOCK, UL LISTED POWER DIST., 1 POLE, 950 AMPS, 600V AC/DC, W/COVER. FREE 2 YEAR RADWELL WARRANTY
- Current Rating: 950 amps
- Number of Contacts: 1
- Terminal Block Type: Power Distribution Block
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Supplier: Mersen
Description: Mersen?s fusible disconnect switches are listed to UL 98 and bear the CE mark conforming to IEC 60947-3. They are ?service entrance? devices capable of fully rated load-break and load-make. While longterm safety, reliability, and functionality are always paramount in the design of
- Approvals: IEC, UL, CSA Mark, RoHS
- Current Rating: 30 amps
- Fuse Type: Class CC
- Mounting Style: Other
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Supplier: ILSCO Corporation
Description: HIGH STRENGTH 6061-T6 ALUMINUM ALLOY MATERIAL 9.875 INCH L X 2 INCH W X 2.5 INCH H SIZE COPPER/ALUMINUM CONDUCTOR MATERIAL UL APPROVAL 1/0 AWG TO 350 KCMIL CONDUCTOR SIZE PLASTISOL INSULATED INSULATION TYPE 6 TERMINAL(S) DOUBLE
- Approvals: UL Listing Mark
- Mounting Options: Terminal Strip
- Number of Contacts: 6
- Terminal Block Type: Dual Level
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Supplier: Marathon Special Products
Description: " ONE PIECE, SINGLE ROW TYPE 6.06 INCH L X 0.56 INCH W X 0.56 INCH H SIZE 16 AWG WIRE SIZE UL 1059, CSA, CE APPROVAL 150 V VOLTAGE RATING PCB MOUNTING 15 AMPERE CURRENT RATING NO COVER TYPE 150 DEG C TEMPERATURE
- Approvals: CE Conformity Marks, CSA Mark (US, C and US, NRTL/C), UL Listing Mark
- Conductor Size (North American): Up to 16 AWG
- Current Rating: 15 amps
- Operating Temperature: 150 C
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poles. Terminations include screw clamps and 0.250″ QCTerminals. All BlockMaster high and medium-power terminal blocks comply with UL and CSA standards as well as RoHS. (read more)
Browse Terminal Blocks Datasheets for BlockMaster Electronics, Inc. -
poles. Terminations include screw clamps and 0.250″ QCTerminals. All BlockMaster high and medium-power terminal blocks comply with UL and CSA standards as well as RoHS. (read more)
Browse Terminal Blocks Datasheets for BlockMaster Electronics, Inc. -
batteries based on UL recognized modules and the UL listing for their 48V battery family. This innovative product line continues Green Cubes’ legacy of pushing electrification forward, providing cutting-edge power solutions for material handling, ground support equipment, automated vehicles and other (read more)
Browse Batteries Datasheets for Green Cubes Technology -
poles. Terminations include screw clamps and 0.250″ QCTerminals. All BlockMaster high and medium-power terminal blocks comply with UL and CSA standards as well as RoHS. (read more)
Browse Wire Terminals Datasheets for BlockMaster Electronics, Inc. -
poles. Terminations include screw clamps and 0.250″ QCTerminals. All BlockMaster high and medium-power terminal blocks comply with UL and CSA standards as well as RoHS. BlockMaster Electronic’s High-Power Thru-Panel Terminal Blocks are available 20A and (read more)
Browse Wire Terminals Datasheets for BlockMaster Electronics, Inc. -
BlockMaster Electronic’s High-Power Thru-Panel Terminal Blocks are available 20A and 25A @ 300V. Also 50A-250A @ 600V. For added protection, we offer clear plastic covers for field installation. All of our products have UL approval and are RoHS compliant. (read more)
Browse Terminal Blocks Datasheets for BlockMaster Electronics, Inc. -
BlockMaster Electronic’s High-Power Terminal Blocks series start at 30A @ 300V and are available up to 130A @ 600V. For added protection, we offer clear plastic covers for field installation. All of our products have UL approval and are RoHS compliant. (read more)
Browse Terminal Blocks Datasheets for BlockMaster Electronics, Inc. -
BlockMaster Electronic’s High-Power Terminal Blocks series start at 30A @ 300V and are available up to 130A @ 600V. For added protection, we offer clear plastic covers for field installation. All of our products have UL approval and are RoHS compliant. (read more)
Browse PCB Terminal Blocks Datasheets for BlockMaster Electronics, Inc. -
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BlockMaster Electronic’s High-Power Terminal Blocks series start at 30A @ 300V and are available up to 130A @ 600V. For added protection, we offer clear plastic covers for field installation. All of our products have UL approval and are RoHS compliant. (read more)
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More Information Top
Indicates content that may require registration and/or purchase.
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Silicon-Film(TM) Solar Cells by a Flexible Manufacturing System: Final Report, 16 April 1998 -- 31 March 2001
Solar electric modules are typically supplied with electrical junction boxes that contain a 600V UL - listed terminal block for the electrical connection.
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Popular Products In Video Surveillance - Big Bruin
Allen Sports Allen Tel Products AT219-6 Wall Single Gang, 1 Port, 6 Position, 6 Conductor Telephone Outlet Jack, Plastic, Ivory Mounts a modular wall telephone set Internal screw- terminal connecting block UL Listed Ivory color CSA Listed, Manufacturer: Allen Tel Products …
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Popular Products In Video Surveillance - Big Bruin
Allen Sports - Allen Tel Products AT219-6 Wall Single Gang, 1 Port, 6 Position, 6 Conductor Telephone Outlet Jack, Plastic, Ivory Mounts a modular wall telephone set Internal screw- terminal connecting block UL Listed Ivory color CSA Listed, Manufacturer: Allen Tel Products …
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https://customer.honeywell.com/resources/techlit/TechLitDocuments/95-0000s/95-7525.pdf
Verify ac voltage source connected to the inside of the main line voltage terminal block is from a UL 1481 listed uninterruptible power supply.
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https://customer.honeywell.com/resources/techlit/TechLitDocuments/95-0000s/95-7509.pdf
VERIFY AC VOLTAGE SOURCE CONNECTED TO INSIDE OF MAIN LINE VOLTAGE TERMINAL BLOCK IS FROM A UL 1481 LISTED UNINTERRUPTIBLE POWER SUPPLY.
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Large-area Silicon-Film{trademark} panels and solar cells. Final technical report, July 1995--March 1998
The new box design eliminates the expensiveprinted circuit card and terminal block which are presently used and is based instead on low-cost, readily available terminal blocks that are already UL - listed for operation at 600 Volts.
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Find more space in your control panel
Typically, power terminal blocks are used in UL 508A– listed industrial control panels and NEC installations for tapping circuits.
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https://customer.honeywell.com/resources/techlit/TechLitDocuments/95-0000s/95-7763.pdf
Verify that the AC voltage source connected to the inside of the main line voltage terminal block is from a UL -1481 listed uninterruptible power supply.
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https://customer.honeywell.com/resources/techlit/TechLitDocuments/85-0000s/85-3112.pdf
24VDC connectors to power terminal block - polarity of each wire designated with flag label power terminal block 24VDC connections to UL - Listed power supply monitored by FACP.
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https://customer.honeywell.com/resources/techlit/TechLitDocuments/95C-00000s/EN1B-0410GE51.pdf
Verify that the AC voltage source connected to the inside of the main line voltage terminal block is from a UL -1481 listed uninterruptible power supply.