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Screw Type vs Spring Clamp PLC Terminal Blocks
Terminal blocks offer flexible and clean wiring for the system with several components such as PLCs, Input/ output devices, etc. These blocks come with a closed frame with the sole purpose of connecting two or more wires.
This article discusses the specifications of Allen Bradley’s Bulletin 1492 of terminal blocks, which will enable you to choose terminal blocks according to your system requirements. Allen Bradley offers a wide range of terminal blocks, but this article will only focus on Bulletin 1492-J screw-type, 1492-W screw-type, and Bulletin 1492-L spring clamp IEC terminal blocks.
Screw-type PLC Terminal Blocks
In the screw terminal connection, the screw is used to hold the electrical wires. This terminal offers easy connection and removal of wires.
Allen Bradley offers a vast range of IEC screw-type terminal blocks with finger-safe housing and self-locking clamp design. We will discuss some important features such as application, voltage ratings, current ratings, temperatures, wire size, etc., which will help you select the terminal blocks for your applications.
A) Thermocouple Screw-type Terminal Blocks
These two-circuit blocks have current bars made of thermocouple material. They have zinc chromate steel screws, and tin-plated terminals and are temperature/heat sensitive. They are recommended for process control systems to prevent additional EMF voltage at terminal block connections.
Thermocouple Screw-type Terminal Blocks
| Specifications | IEC | ATEX |
| Wire Range | 30 AWG – 12 AWG | 30 AWG – 12 AWG |
| Voltage Rating | — | 55 Volts AC/DC |
| Dimensions (Width x Length x Height) | 0.40 inches x 2.36 inches x 1.69 inches | 0.40 inches x 2.36 inches x 1.69 inches |
| Wire Strip Length | 10 millimeters | 10 millimeters |
| Housing Temperature Range | – 50 to +120 degrees Celsius | – 50 to +120 degrees Celsius |
| Recommended Tightening Torque | 0.4 to 0.6 Newton-meter | 0.4 to 0.6 Newton-meter |
B) Feed-through Screw-type Terminal Blocks
Allen Bradley offers a wide range of feedthrough terminal blocks such as stab-connect, standard, and space-saver (compact) feedthrough blocks for single-circuit feedthrough applications. This family also offers specialty feedthrough blocks with test plugs and adapters to identify the voltage presence and perform a simple diagnostic.
Feed-through Terminal Blocks Specifications
| Category | Sub-Category | IEC Specifications (Voltage Rating, Maximum Current, Wire Range, Wire Strip Length, Recommended Tightening Torque, Housing Temperature Range) |
| Standard Feedthrough Blocks | One-Circuit Feedthrough blocks | 800 Volts AC/DC, 24 to 41 Amperes, 2.5 – 6mm², 10 to 12 millimeters, 0.5 to 1.6 Newton-meter, – 50 to +120 degrees Celsius |
| Standard Feedthrough Blocks | One-Circuit Feedthrough blocks | 1000 Volts AC/DC, 57 to 269 Amperes, 10 – 120mm², 12 to 27 millimeters, 2.3 to 16 Newton-meter, – 50 to +120 degrees Celsius |
| Standard Feedthrough Blocks | Single-circuit, space-saver Feedthrough Blocks | 800 Volts AC/DC, 24 to 76 Amperes, 0.5 – 16mm², 9 to 13 millimeters, 0.6 to 2.1 Newton-meter, – 40 to +90 degrees Celsius |
| Stab-connect Feed through Blocks | One-circuit feedthrough block | 500 Volts AC/DC, 16 Amperes, 2.5mm², 10 millimeters, 0.5 to 0.8 Newton-meter, – 50 to +120 degrees Celsius |
| Stab-connect Feed through Blocks | Two-circuit feedthrough block | 400 Volts AC/DC, 16 Amperes, 2.5mm², 10 millimeters, 0.5 to 0.8 Newton-meter, – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | One-circuit feedthrough, each side with 2 Connection points | 800 Volts AC/DC, 17.5 Amperes, 1.5mm², 7 millimeters, 0.5 Newton-meter, – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | One-circuit feedthrough, each side with 2 Connection points | 500 Volts AC/DC, 32 Amperes, 0.4 to 4mm², 10 millimeters, 0.7 Newton-meter, – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | One-circuit feedthrough with three Connection points (2 on one side) | 800 Volts AC/DC, 17.5 Amperes /single-side (24A /twin-side), 2.5mm²/ single-side( 2.5mm²/ twin-side), 10 millimeters /single-side (7 millimeters/twin-side), 0.8 Newton-meter /single-side (0.5 N.m/twin-side), – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | One-circuit feedthrough with three Connection points (2 on one side) | 500 Volts AC/DC, 32 Amperes, 4mm², 10 millimeters, 0.7 Newton-meter, – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | One-circuit feedthrough with three Connection points (2 on one side) | 800 Volts AC/DC, 32 Amperes, 0.5 to 4mm², 10 millimeters, 0.6 Newton-meter, – 40 to +90 degrees Celsius |
| Speciality Feedthrough Blocks | Circuit – break test or measurement plug capability | 500 Volts AC/DC, 6 Amperes, 0.5 to 4mm², 10 millimeters, 0.5 to 0.8 Newton-meter, – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | Motor connection block cluster, having 3 feeds and ground | 800 Volts AC/DC, 32 Amperes, #22…10 AWG (4mm²), 10 millimeters, 1.0 Newton-meter, – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | Single-circuit block, terminals on common side | 500 Volts AC/DC, 15 Amperes, 0.5 to 2.5mm², 10 millimeters, 0.6 Newton-meter, – 40 to +90 degrees Celsius |
C) Grounding Screw-type Terminal Blocks
These blocks are used to ground a circuit/controller to the DIN Rail. This family offers a wide range of terminals with specifications as mentioned below.
Grounding Screw-type Terminal Blocks Specifications
| Category | Sub-Category | Specifications (Wire Range, Wire Strip Length, Recommended Tightening Torque, Housing Temperature Range) |
| One-Circuit Feed-Through Grounding Blocks | Standard Feedthrough | #24 AWG to #1/0 AWG, 10 to 27 millimeters, 1.6 to 10 Newton-meter, – 50 to +120 degrees Celsius |
| One-Circuit Feed-Through Grounding Blocks | 2 Connection points on each side | #30 AWG to #10 AWG, 7 to 10 millimeters, 0.6 to 0.7 Newton-meter, – 50 to +120 degrees Celsius |
| One-Circuit Feed-Through Grounding Blocks | 3 Connection points, 2 on one side | #30 AWG to #10 AWG, 7 to 10 millimeters, 0.5 to 0.7 Newton-meter, – 50 to +120 degrees Celsius |
| Two-Circuit Feed-Through Grounding Blocks | Standard Feedthrough | # 26 AWG to # 10 AWG, 7 to 10 millimeters, 0.5 to 1.0 Newton-meter, – 50 to +120 degrees Celsius |
| Two-Circuit Feed-Through Grounding Blocks | 4 Connection points/Two-level block | #26 AWG to #10 AWG, 8 to 10 millimeters, 0.5 to 1.0 Newton-meter, – 50 to +120 degrees Celsius |
| Space-Saver Grounding Blocks | Single-circuit grounding | 22 AWG to 4 AWG, 11 to 13 millimeters, 0.7 to 2.1 Newton-meter, – 40 to +90 degrees Celsius |
D) Fuse Screw-type Terminal Blocks
These terminal blocks are used for overcurrent protection. They are available in a range of sizes for different types of fuses. They have nickel-plated terminals, stainless steel screws, and a status/neon fuse indicator light.
This family provides a diverse range of terminal blocks with the parameters listed below.
Fuse Screw-type Terminal Blocks Specifications
| Category | Sub-Category | IEC Specifications (Voltage Rating, Maximum Current, Fuse Size, Wire Size Range, Wire Strip Length, Recommended Tightening Torque, Housing Temperature Range) |
| One-Circuit Fuse Blocks | with or without blown fuse indication | 10 to 500 volts AC/DC, 6.3 Amperes, 1/4 x 5/4 inches, 6mm², 12 millimeters, 1.2 Newton-meter, – 50 to +120 degrees Celsius |
| One-Circuit Fuse Blocks, Type J | with or without blown fuse indication | 10 to 500 volts AC/DC, 6.3 Amperes, 5 x 20 millimeters, 6mm², 12 millimeters, 1.6 Newton-meter, – 50 to +120 degrees Celsius |
| One-Circuit Fuse Blocks, Type W | Non-Indicating | 500 volts AC/DC, 15 Amperes, 5 x 20 millimeters, 0.5 – 4mm², 8 millimeters, 0.3 to 0.6 Newton-meter, – 40 to +90 degrees Celsius |
| One-Circuit Fuse Blocks, Type W | Red LED indicator | 10 to 57 volts AC/DC, 15 Amperes, 5 x 20 millimeters, 0.5 – 4mm², 8 millimeters, 0.3 to 0.6 Newton-meter, – 40 to +90 degrees Celsius |
| One-Circuit Fuse Blocks, Type W | Neon indicator | 85…264 volts AC, 15 Amperes, 5 x 20 millimeters, 0.5 – 4mm², 8 millimeters, 0.3 to 0.6 Newton-meter, – 40 to +90 degrees Celsius |
| Two-Level Blocks | feedthrough and hinged-arm fuse circuit | 500 volts AC/DC, 6.3 Amperes, 5 x 20 millimeters, 0.5 – 4mm², 9 millimeters, 0.65 Newton-meter, – 50 to +120 degrees Celsius |
| Three-Level Blocks | ground point, feedthrough & hinged-arm fuse circuit | 500 volts AC/DC(IEC), 6.3 Amperes (IEC), 5 x 20 millimeters, 0.5 – 4 mm², 9 millimeters, 0.65 Newton-meter, – 50 to +120 degrees Celsius |
E) Internal Component Screw-type Terminal Blocks
These blocks come with electronic components such as a diode (Forward/Reverse mode), capacitor, surge suppressor, and resistor to permit the insertion of these components in control circuitry.
This family offers a wide variety of terminal blocks with the specifications stated below.
Internal Component Screw-type Terminal Blocks Specifications
| Category | Sub-Category | IEC Specifications (Voltage Rating, Maximum Current, Current through Busbar, Wire Size Range, Wire Strip Length, Recommended Tightening Torque, Housing Temperature Range) |
| One-Circuit Feedthrough Blocks | single-level forward diode with test plug ports | 500 volts AC/DC, 6 Amperes, 14 Amperes, 0.5 – 2.5mm², 10 millimeters, 0.5 – 0.7 Newton-meter, – 50 to +120 degrees Celsius |
| Two-Circuit Feedthrough Blocks | forward bias diode between the two levels | 400 volts AC/DC (1000 volts reverse voltage rating), 1 Ampere, 10 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.8 Newton-meter, – 50 to +120 degrees Celsius |
| Two-Circuit Feedthrough Blocks | reverse bias diode between the two levels | 400 volts AC/DC (1000 volts reverse voltage rating), 1 Ampere, 10 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.8 Newton-meter, – 50 to +120 degrees Celsius |
| Two-Circuit Feedthrough Blocks | 249-ohm precision wire wound resistor between the two levels | 400 volts AC/DC, — , 10 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.8 Newton-meter, – 50 to +120 degrees Celsius |
| Two-Circuit Feedthrough Blocks | a MOV between the two levels | 115 volts AC/DC, —, 24 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.8 Newton-meter, – 50 to +120 degrees Celsius |
F) Multi-circuit Feedthrough Screw-type Terminal Blocks
These blocks allow control signals to connect or distribute within the same block. This family offers a wide range of connectors with the following specifications.
Multi-circuit Feedthrough Screw-type Terminal Blocks Specifications
| Category | Sub-Category | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Recommended Tightening Torque, Housing Temperature Range) |
| Two-circuit feedthrough Blocks | Two-level | 400 volts AC/DC, 24 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.8 Newton-meter, – 50 to +120 degrees Celsius |
| Two-circuit feedthrough Blocks | Two-level | 800 volts AC/DC, 32 Amperes, 0.5 to 4mm², 8 millimeters, 0.5 Newton-meter, – 50 to +120 degrees Celsius |
| Three-circuit feedthrough Blocks | Three-level with ground point | 400 volts AC/DC, 24 Amperes, 0.5 to 2.5mm², 7 millimeters, 0.5 Newton-meter, – 50 to +120 degrees Celsius |
G) Double Level Plug-in Screw-type Terminal Blocks
These terminal Blocks double the circuit wiring density by allowing the plugging of discrete electronic components, including circuit isolation plugs or fuses, etc.
This family includes a variety of connectors with the following features.
Double Level Plug-in Screw-type Terminal Blocks Specifications
| Category | Sub-Category | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Recommended Tightening Torque, Housing Temperature Range) |
| Two-circuit feedthrough Blocks with Selectable component plug-in device | Internal Surge Suppression | 500 volts AC/DC, 24 Amperes, 2.5mm², 8 millimeters, 0.5 Newton-meter, – 50 to +120 degrees Celsius |
| Two-circuit feedthrough Blocks with Selectable component plug-in device | Internal Surge Suppression | 500 volts AC/DC, 24 Amperes, 2.5mm², 8 millimeters, 0.5 Newton-meter, – 50 to +120 degrees Celsius |
| Two-circuit feedthrough Blocks with Selectable component plug-in device | Internal Surge Suppression | 115 volts AC, 24 Amperes, 2.5mm², 8 millimeters, 0.5 Newton-meter, – 50 to +120 degrees Celsius |
H) Process IEC Screw-type Terminal Blocks
These small-size terminal blocks are specially designed for process marshaling. They save 45% or more space in the panel, offer integrated shielding connections and eliminate the necessity of a grounding terminal.
These blocks have the following subcategories and specifications.
Process IEC Screw-type Terminal Blocks Specifications
| Category | Sub-Category | Special Feature | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Recommended Tightening Torque, Housing Temperature Range) |
| One-circuit feedthrough Blocks | Standard | Standard Feedthrough | 800 volts AC/DC, 24 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.6 Newton-meter, – 50 to +120 degrees Celsius |
| One-circuit feedthrough Blocks | Disconnect style fusible block | With or Without Fuse Indication | 10 to 500 volts AC/DC, 6.3 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.6 Newton-meter, – 50 to +120 degrees Celsius |
| One-circuit feedthrough Blocks | Disconnect style fusible block with ground connection | With or Without Fuse Indication | 10 to 500 volts AC/DC, 6.3 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.6 Newton-meter, – 50 to +120 degrees Celsius |
| One-circuit feedthrough Blocks | Knife disconnect style block | Standard Feedthrough | 500 volts AC/DC, 20 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.6 Newton-meter, – 50 to +120 degrees Celsius |
| One-circuit feedthrough Blocks | Knife disconnect and ground connection | Standard Feedthrough | 500 volts AC/DC, 20 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.6 Newton-meter, – 50 to +120 degrees Celsius |
| One-circuit feedthrough Blocks | Knife disconnect and ground connection | Test Screws | 500 volts AC/DC, 20 Amperes, 2.5mm², 10 millimeters, 0.5 – 0.6 Newton-meter, – 50 to +120 degrees Celsius |
Spring-clamp Terminal Blocks
Allen Bradley’s spring-clamp terminal blocks are din rail-mounted blocks that offer time-saving, easy troubleshooting, secure, and durable connections compared to screw-type terminal blocks.
This product line offers a variety of terminal blocks. We will discuss their features and applications in this section to help you select a terminal block for your system.
A) Feed-Through Spring-clamp Terminal Blocks
This catalog offers standard feedthrough blocks for single-circuit applications and specialty feedthrough blocks with two levels to create a common link between two circuits.
This family provides a variety of connectors with the following specs.
Feed-Through Spring-clamp Terminal Blocks Specifications
| Category | Sub-Category | Special Feature | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Housing Temperature Range) |
| Standard Feedthrough blocks | One-circuit feedthrough Blocks | Standard Feedthrough | 500 to 800 volts AC/DC, 17.5 to 125 Amperes, 1.5 to 35mm², 10 – 25 millimeters, – 50 to +120 degrees Celsius |
| Standard Feedthrough blocks | One-circuit feedthrough Blocks | 2 Connection points on one side | 500 to 800 volts AC/DC, 17.5 to 41 Amperes, 1.5 to 6mm², 10 – 13 millimeters, – 50 to +120 degrees Celsius |
| Standard Feedthrough blocks | One-circuit feedthrough Blocks | 2 Connection points on each side | 500 to 800 volts AC/DC, 17.5 to 32 Amperes, 1.5 to 4mm², 10 – 12 millimeters, – 50 to +120 degrees Celsius |
| Standard Feedthrough blocks | One-circuit feedthrough Blocks | Center Jumper Connection /Feed based Power Distribution Block | 500 volts AC/DC, 76 Amperes, 16mm², 18 millimeters, – 50 to +120 degrees Celsius |
| Speciality Feedthrough Blocks | Two-Circuit Feed-Through Block | a commoning bar connecting two circuits. | 500-800 volts AC/DC, 17.5 – 32 Amperes, 1.5 to 4 mm², 10 millimeters, – 50 to +120 degrees Celsius |
B) Multi-circuit Feed-through Spring-clamp Terminal Blocks
These connectors offer a high-wiring density and allow the joining/splitting of control circuits within the same block.
The following connectors are available in this product range.
Multi-circuit Feedthrough Spring-clamp Terminal Blocks Specifications
| Category | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Housing Temperature Range) |
| Two-circuit feedthrough Blocks | 500-800 volts AC/DC, 17.5 – 32 Amperes, 1.5 to 4mm², 10 millimeters, – 50 to +120 degrees Celsius |
| Side-by-Side Two-circuit feedthrough Blocks | 800 volts AC/DC, 24 Amperes, 2.5mm², 10 millimeters, – 50 to +120 degrees Celsius |
| Three-circuit feedthrough Blocks | 500 volts AC/DC, 20 Amperes, 2.5mm², 10 millimeters, – 50 to +120 degrees Celsius |
C) Sensor Spring-clamp Terminal Blocks
These Plug-in style blocks allow coordination of three-wire sensor applications. They have status indicators for voltage ranges of 10 volts to 30 volts.
This product line offers a variety of connectors as tabulated below.
Sensor Spring-clamp Terminal Blocks Specifications
| Category | Special Feature | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Housing Temperature Range) |
| Three Conductor Sensor Block (3 circuits) | With or Without LED | 250 volts AC/DC without LED (5…30V AC/DC with LED) , 17.5 Amperes, 1.5mm², 8 millimeters, – 50 to +120 degrees Celsius |
| Three Conductor Sensor Block (4 circuits) | With or Without LED | 250 volts AC/DC without LED (5…30V AC/DC with LED) , 17.5 Amperes, 1.5mm², 8 millimeters, – 50 to +120 degrees Celsius |
| Plug-In Distribution Block – Internally Jumpered | Standard Feedthrough | 250 volts AC/DC without LED (5…30V AC/DC with LED) , 17.5 Amperes, 1.5mm², 8 millimeters, – 50 to +120 degrees Celsius |
| Plug-In Distribution Ground Block – Internally Jumpered | Standard Feedthrough | 250 volts AC/DC without LED (5…30V AC/DC with LED) , 17.5 Amperes, 1.5mm², 8 millimeters, – 50 to +120 degrees Celsius |
| Three Conductor Sensor Ground Block ( 3/4 circuits) | Standard Feedthrough | 250 volts AC/DC, 17.5 Amperes, 1.5mm², 8 millimeters, – 50 to +120 degrees Celsius |
D) Panel Mount Mini Spring-clamp Terminal Blocks
These terminal blocks are preferred in high-density wiring applications. They come with the following types and features.
Panel Mount Mini Spring-clamp Terminal Blocks Specifications
| Category | Special Feature | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Housing Temperature Range) |
| Mini Surface Mount Feedthrough Block | Standard Feedthrough | 800 volts AC/DC, 24 Amperes, 2.5 mm², 10 millimeters, – 50 to +120 degrees Celsius |
| Mini Surface Mount Feedthrough Block | End Block | 800 volts AC/DC, 24 Amperes, 2.5 mm², 10 millimeters, – 50 to +120 degrees Celsius |
| Mini Surface Mount Feedthrough Block | 4 Connection points | 800 volts AC/DC, 24 Amperes, 2.5 mm², 10 millimeters, – 50 to +120 degrees Celsius |
| Mini Surface Mount Feedthrough Block | 4 Connection points End Block | 800 volts AC/DC, 24 Amperes, 2.5 mm², 10 millimeters, – 50 to +120 degrees Celsius |
E) Neutral Disconnect & Installation Spring-clamp Terminal Blocks
These blocks operate through a sequence of feed-through circuits, ground circuits, and circuits connected directly to a bus bar. They offer additional safety by necessitating the use of a tool to open/close these circuits. These three-circuit blocks come with 1 neutral disconnect, 1 Feedthrough, and 1 ground connection.
Neutral Disconnect & Installation Spring-clamp Terminal Blocks Specifications
| Specifications | CSA | IEC |
| Height x Length x width | 41x 95 x 5.1 mm | |
| Voltage rating | 300V AC/DC | 400V AC/DC |
| Wire Range | 26 to 12 AWG | 2.5mm² |
| Current Rating | 10A | 24A |
| Wire strip length | 8mm | |
| Housing Temp range | -50 to 120o C |
F) Grounding Spring-clamp Terminal Blocks
These terminal blocks provide a grounding connection to the din rail. You may provide a grounding point in your system using these blocks to protect against earth or ground faults.
Grounding Spring-clamp Terminal Blocks Specifications
| Category | Sub-Category | Specifications (Wire Range, Wire Strip Length, Housing Temperature Range) |
| One-Circuit Feed-Through Grounding Blocks | Standard Feedthrough | 1.5 to 35mm² , 10 to 25 millimeters, – 50 to +120 degrees Celsius |
| One-Circuit Feed-Through Grounding Blocks | 2 Connection points on each side | 1.5 to 6mm² , 10 to 13 millimeters, – 50 to +120 degrees Celsius |
| One-Circuit Feed-Through Grounding Blocks | 3 Connection points, 2 on one side | 1.5 to 4mm² , 10 to 12 millimeters, – 50 to +120 degrees Celsius |
| One-Circuit Feed-Through Grounding Blocks | 1 fixed and 1 plug-in connection | 0.5 to 2.5mm² , 10 millimeters, – 50 to +120 degrees Celsius |
| Two-Circuit Feed-Through Grounding Blocks | Standard Feedthrough (17.5 to 32 Amperes @ 500 to 800 Volts AC/DC) | 1.5 to 4mm² , 10 millimeters, – 50 to +120 degrees Celsius |
| Two-Circuit Feed-Through Grounding Blocks | A commoning bar connecting two circuits | 1.5 to 4mm² , 10 millimeters, – 50 to +120 degrees Celsius |
G) Comb Connection Spring-clamp Terminal Blocks
These blocks have a standard cage-type clamp connection on one side and a comb-style connection on the other end. These connectors allow you to connect multiple connections quickly within one block.
Comb Connection Spring-clamp Terminal Blocks Specifications
| Category | Sub-Category | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Housing Temperature Range) |
| One-circuit feedthrough Blocks | Plug in comb connections on one side | 250 volts AC/DC, 16 Amperes, 2.5mm², 10 millimeters, – 50 to +120 degrees Celsius |
| Two-circuit feedthrough Blocks | Plug in comb connections on one side | 250 volts AC/DC, 16 Amperes, 2.5mm², 10 millimeters, – 50 to +120 degrees Celsius |
H) Interlocking Mini-block Spring-clamp Terminal Blocks
These rail/panel mount terminal blocks have 600 volts UL-rated springs. They are used for high-dense wring systems.
They come in a variety of types, as listed below.
Interlocking Mini-block Spring-clamp Terminal Blocks Specifications
| Category | Sub-Category | IEC Specifications (Voltage Rating, Maximum Current, Wire Size Range, Wire Strip Length, Housing Temperature Range) |
| Mini Rail Mount | Feedthrough Block | 800 volts AC/DC, 24 Amperes, 2.5mm², 10 millimeters, – 50 to +120 degrees Celsius |
| Mini Rail Mount | Feedthrough Ground Block | Grounding, Grounding, 2.5mm², 10 millimeters, – 50 to +120 degrees Celsius |
Final Remarks
While selecting the terminal blocks for your system, keep in mind the maximum current, ambient temperature, voltage rating, wire ratings, and purpose of using these blocks, such as grounding and fusing along-with space-saving connections.
| Screw Terminal Block | Spring Terminal Block |
| Using a screw to fix the connection | Using a spring to hold the connection |
| Old Technology | Advanced Technology |
| Screw driver is necessary | No need of screw driver |
| More wiring time | Less wiring time |
| Wires connect/Disconnect difficult | Plugin / Plug out easy |
| Wire damage chances during connection | 0 % Wire damage chances during plug in/out |
| Available in both din rail /panel mounted | Available in both din rail/panel mounted |
| Less reliable in harsh environments(vibrations) | Less reliable in harsh environments(vibrations) |
This entry was posted on April 19th, 2022 and is filed under Uncategorized. Both comments and pings are currently closed.
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