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: Allied Electronics, Inc.
Description: Terminal Block, Nominal Current 30 A, Nominal Voltage 600 V Sturdy housings with an extremely precise pitch. Polyamide Insulating Material Voltage: 600, Amps: 30, AWG: 30-10 Screw Connection Blocks
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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 required by
- Length / Height: 14 inch
- Width/Diameter: 12 inch
- Depth: 7 inch
- Type: Terminal and Junction Boxes
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Supplier: LMI Components, Inc.
Description: PLUGGABLE TERMINAL BLOCKS
- Number of Contacts: 36
- Contacts Pitch: 5.08 mm
- Conductor Size (North American): 14 to 22 AWG
- Voltage Rating: 300 volts
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Supplier: Allied Electronics, Inc.
Description: Female Disconnects Terminal, Vinyl Insulation Fully Insulated Nylon Female - 187 Series Disconnects For Wire Range 16-14 Length 0.89, Tab Size .187 x .020 , Blue Features: Quick, reliable method of connection to terminal blocks and boards without the use of tools Unique
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Supplier: VAST STOCK CO., LIMITED
Description: Fixed Terminal Blocks MKKDSH 3/ 2 BK
- Number of Contacts: 2
- Contacts Pitch: 5 mm
- Voltage Rating: 400 volts
- Current Rating: 24 amps
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Supplier: Allied Electronics, Inc.
Description: Terminal Block
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Supplier: Allied Electronics, Inc.
Description: ceramic terminal blocks
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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 centerlines.
- Number of Contacts: 2 to 24
- Contacts Pitch: 5 mm
- Conductor Size (North American): 22 to 18 AWG
- Voltage Rating: 250 volts
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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[TM] BRAND NUMBER OF TERMINALS 4 MOUNTING HOLE SIZE 0.17 INCH OVERALL
- Number of Contacts: 2
- Conductor Size (North American): 2 to 14 AWG
- Voltage Rating: 600 volts
- Current Rating: 75 amps
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Supplier: OMEGA Engineering, Inc.
Description: The AVK Series Feed Through Terminal Blocks offer savings in cost, space and time. These terminal blocks mount on standard 35 x 15mm and 35 x 7.5 mm DIN rails and are design to meet world wide standards. The AVK terminal blocks come in all wire ranges and no
- Number of Contacts: 2
- Conductor Size (North American): 26 to 0 AWG
- Voltage Rating: 600 to 1,000 volts
- Current Rating: 20 to 192 amps
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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
- Number of Contacts: 2
- Conductor Size (North American): 26 to 0 AWG
- Voltage Rating: 600 to 8,000 volts
- Current Rating: 20 to 150 amps
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Supplier: BlockMaster Electronics, Inc.
Description: 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.
- Number of Contacts: 2 to 25
- Contacts Pitch: 11 mm
- Conductor Size (North American): 12 to 10 AWG
- Voltage Rating: 300 volts
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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
- Number of Contacts: 2
- Conductor Size (North American): 24 to 10 AWG
- Voltage Rating: 600 to 1,000 volts
- Current Rating: 10 amps
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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
- Number of Contacts: 2 to 5
- Conductor Size (North American): 28 to 4 AWG
- Voltage Rating: 550 to 8,000 volts
- Current Rating: 20 to 125 amps
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Supplier: Transtector Systems, Inc.
Description: 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 with details of
- Length / Height: 15.5 inch
- Width/Diameter: 13.32 inch
- Depth: 8.26 inch
- Height: 15.5 inch
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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
- Number of Contacts: 2
- Conductor Size (North American): 24 to 10 AWG
- Voltage Rating: 600 to 1,000 volts
- Terminal Block Type: Ground Circuit Terminal
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Supplier: Newark, An Avnet Company
Description: Surface-Mount Closed Loop MagenticContact with quick-connect terminal block. 1" Gap. UL, CUL Listed. Brown. Sold in multiples of 10 (price is for 1 pc).
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Supplier: Newark, An Avnet Company
Description: Surface-Mount Closed Loop MagenticContact with quick-connect terminal block. 1" Gap. UL, CUL Listed. White. Sold in multiples of 10 (price is for 1 pc).
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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
- Number of Contacts: 4
- Conductor Size (North American): 24 to 10 AWG
- Voltage Rating: 600 to 1,000 volts
- Terminal Block Type: Ground Circuit Terminal
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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 ADDER POLE(S) BOX LUG TERMINAL TYPE CLASS J FUSE TYPE 30 AMPERE FUSE CURRENT RATING 600 V FUSE VOLTAGE RATING MARATHON. BRAND CLIP MATERIAL TIN PLATED COPPER ALLOY 6J30A MODEL "
- Conductor Size (North American): 14 to 6 AWG
- Voltage Rating: 600 volts
- Current Rating: 30 amps
- Approvals: CE Conformity Marks, CSA Mark (US, C and US, NRTL/C), UL Listing Mark
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Supplier: OMEGA Engineering, Inc.
Description: The XRAPLCESK power terminal block has the same shape as the relay modules and is used to feed in the bridging potentials. The nominal current is 32 A. When the total current is less than or equal to 6 A, supply can take place directly at the connecting terminal blocks of
- Number of Contacts: 5
- Conductor Size (North American): 26 to 14 AWG
- Voltage Rating: 24 to 120 volts
- Current Rating: 0.0035 to 32 amps
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Supplier: Marathon Special Products
Description: " STANDARD TYPE 1.653 INCH W X 1.496 INCH H SIZE GRAY COLOR 0.236 INCH BLOCK WIDTH 22 TO 10 AWG (UL/CSA), 0.5 TO 6 SQ MM (VDE) WIRE SIZE SINGLE TIER 1 CIRCUIT CONFIGURATION UL, CSA APPROVAL 600 V (UL/CSA), 750 V (VDE) VOLTAGE RATING 35 MM DIN 3 RAIL MOUNTING 30 AMPERE
- Conductor Size (North American): 22 to 10 AWG
- Voltage Rating: 600 to 750 volts
- Current Rating: 30 to 40 amps
- Mounting Options: 35 mm DIN Rail
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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
- Conductor Size (North American): 8 to 18 AWG
- Voltage Rating: 600 volts
- Current Rating: 15 amps
- Terminal Block Type: Disconnect or Switch Block
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Supplier: Schneider Electric, Automation & Control
Description: Linergy TRR Spring terminal blocks: Fast and easy solution with high vibration resistance and extensive accessories range. Linergy TRV Screw terminal blocks: Terminal blocks solution that suits the widest range of applications, with extended range of
- Voltage Rating: 690 to 1,000 volts
- Current Rating: 22 to 24 amps
- Operating Temperature: -40 to 130 C
- Approvals: CSA Mark (US, C and US, NRTL/C), UL Listing Mark
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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
- Voltage Rating: 1,000 volts
- Current Rating: 65 to 2,260 amps
- Operating Temperature: 80 C
- Approvals: CSA Mark (US, C and US, NRTL/C), UL Listing Mark
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Supplier: Newark, An Avnet Company
Description: " Rare-Earth, Stubby Press-Fit Mount Closed Loop MagenticContact with quick-connect terminal block. 1" Gap. 18" leads. UL, CUL Listed. White. Sold in multiples of 10 (price is for 1 pc).
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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: TelephoneStuff.com
Description: Chatsworth's Two Mounting Hole Ground Terminal Block provides a convenient way to attach ground wires to racks or cabinets and meets BICSI and ANSI/EIA/TIA two-hole mounting recommendations. Constructed of extruded, high-strength aluminum and accepts conductors ranging from #14 AWG
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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
- Number of Contacts: 1
- Current Rating: 950 amps
- Terminal Block Type: Power Distribution Block
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Supplier: Greaves Corporation
Description: MODULAR TYPE 2.9 INCH L X 1 INCH W X 2.3 INCH H SIZE COPPER/ALUMINUM CONDUCTOR MATERIAL UL APPROVAL 600 VAC VOLTAGE RATING 175 AMPERE CURRENT RATING NO COVER TYPE 90 DEG C TEMPERATURE RATING HIGH DIELECTRIC HIGH IMPACT TOUGH FIBERGLASS HOUSING MATERIAL 1 POLE(S) 14 TO 4 AWG SECONDARY OPENING
- Voltage Rating: 600 volts
- Current Rating: 175 amps
- Operating Temperature: 90 C
- Terminal Block Type: Power Distribution Block
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Supplier: Hubbell Incorporated
Description: 1-PIECE TYPE 3-7/32 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 4 CIRCUIT(S) NUMBER OF CIRCUITS 4
- Voltage Rating: 600 volts
- Current Rating: 30 amps
- Terminal Block Type: Single Feed Through
- Mounting Options: Terminal Strip
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Supplier: LCSC Electronics Technology (HK) Limited
Description: 22~28 0.08~0.3 UL , RoHS , HF - Line Pressing Terminals ROHS
- Conductor Size (North American): 22 to 28 AWG
- Features: Other
- Approvals: UL Listing Mark
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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. Tension Clamp Connection The
- Number of Contacts: 2 to 12
- Contacts Pitch: 5 to 10 mm
- Conductor Size (North American): 26 to 14 AWG
- Voltage Rating: 300 volts
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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 our
- Current Rating: 60 amps
- Operating Voltage: 250 volts
- Short Circuit Interrupt Capacity: 200 kiloamps
- Poles: 4 Poles
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Supplier: Weidmuller
Description: The innovative quick connection – simple, safe, and cost-effective: PCB terminals with the PUSH IN direct-wire-insert spring connection. A milestone in connection technology. Compact dimensions yet surprisingly powerful; SMD technology, 3.5 mm (0.138 inch) pitch Compact spring connection that
- Number of Contacts: 2 to 24
- Contacts Pitch: 3.5 to 7.62 mm
- Conductor Size (North American): 26 to 16 AWG
- Voltage Rating: 800 volts
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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. -
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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)
Browse PCB Terminal Blocks Datasheets for BlockMaster Electronics, Inc. -
Altech Power Distribution Blocks are designed for efficient, reliable power routing in panels, solar systems, and control equipment. The line includes one-phase and three-phase options, IP20 finger-safe protection, DIN rail or panel mounting, and hybrid connection (read more)
Browse Power Distribution Units (PDU) Datasheets for Altech Corp.
More Information Top
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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.