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Brand: Allen-Bradley
Allen-Bradley 1492-L4 Spring Clamp Feed-Through Block 4 mm
Description
A 6.1 mm wide, spring-clamp DIN-rail terminal block for 4 mm2 wire
The Allen-Bradley 1492-L4 is a one-circuit, gray, feed-through terminal block with a spring clamp connection. It takes wire from #26 up to #10 AWG, and Rockwell lists it as a 4 mm2 block (20 to 10 AWG rated cross section). The housing is only 6.1 mm wide, which is why it is used where many circuits must fit on a short rail.
Spring clamps hold the wire with constant pressure, so there is no screw to loosen from vibration and no retightening at maintenance time. That is a real advantage on pump skids, compressors and other machinery that shakes.
Technical specifications
| Parameter | Specification |
|---|---|
| Catalog number | 1492-L4 |
| Type | One-circuit feed-through terminal block, standard, gray |
| Connection | Spring clamp |
| Rated cross section | 4 mm2 (20 to 10 AWG) |
| Wire range | #26 to #10 AWG |
| Voltage rating | 600V AC/DC (CSA); 800V AC/DC (IEC); 550V AC/DC (ATEX) |
| Maximum current (CSA / IEC) | 33 A / 35 A |
| Wire strip length | 12 mm (0.47 in.) |
| Width (pitch) | 6.1 mm (0.24 in.) |
| Density | 49 pcs per ft (163 per m) |
| Housing temperature range | -50 to +120 C (-58 to +248 F) |
| Jumper (feed-in, up to 76 A) | 1492-CJK6-1 |
| End barrier | 1492-EBL4 (gray), -B (blue), -Y (yellow) |
| Related variants | 1492-L4T (3 connection points), 1492-L4Q (4 connection points) |
Using the block
Strip the wire to 12 mm and push a solid or ferruled conductor into the clamp, then open the spring with a screwdriver to release it. Because the maximum current is 33 A on the CSA rating and 35 A to IEC, it suits control circuits and moderate power feeds rather than large motor feeders.
The table in 1492-TD015 shows that when a jumper is used to distribute supply to neighbouring blocks, the L4 can feed up to 76 A in total using the 1492-CJK6-1 jumper, as long as the limit of each single block is not exceeded.
Spring-clamp blocks are popular in marine, oil and gas and process plants because installation is quick and the connection does not depend on an installer’s torque setting. Ferrules are recommended for stranded wire, since they give a clean, repeatable contact. For field-wired instruments with many cores, a 6.1 mm pitch lets a 32-point row occupy only about 20 cm of rail, which keeps junction boxes compact.
Planning a terminal row
End barriers close the row at either end, and the L4 has three colour choices to mark circuits, namely gray, blue and yellow. The barrier measures 2 x 34.85 x 62 mm, and a pack contains 50 pieces.
Group circuits by voltage and function, leave spare terminals for future changes, and mark every block with its circuit number. For ATEX or marine applications check the certificate list in the technical data, because the approvals depend on the voltage and the current rating used.
Related Allen-Bradley products: Allen-Bradley 1492-J4 4 mm2 Feed-Through Terminal Block, Allen-Bradley 1492-J10 10 mm2 Feed-Through Terminal Block, Allen-Bradley 1492-W4 4 mm2 Screw Terminal Block, Allen-Bradley 1734-TOPS POINT I/O Spring-Clamp Wiring Base, Allen-Bradley 1794-TB3 FLEX I/O Cage-Clamp Terminal Base and Allen-Bradley 1492-JD3 2.5 mm2 Double-Level Terminal Block.
Ordering and documents
Order 1492-L4 exactly as printed. The hosted document is the Bulletin 1492 terminal block specifications 1492-TD015A, and the photo is the official Rockwell product photograph of this part. More wiring products are listed in the Automation Accessories category.
Seven Star LLC is an independent supplier in Muscat and quotes on request. Please confirm the catalog number, ratings and the current product status against the latest Rockwell Automation documents before ordering.
Datasheets & Documents
- Datasheet Terminal Block Specifications, Bulletin 1492 (1492-TD015A-EN-P) Download
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About brand
Allen-Bradley is the brand of Rockwell Automation for industrial control: ControlLogix and CompactLogix controllers, I/O systems, PanelView operator terminals, PowerFlex drives, motor control and industrial network equipment. The company began in Milwaukee in 1903, when Lynde Bradley and Dr. Stanton Allen formed the Compression Rheostat Company to make the motor speed controller Bradley had invented in 1901. It took the name Allen-Bradley in 1909 and was bought by Rockwell International in 1985. Since 2001 its owner has been Rockwell Automation, which is still headquartered in Milwaukee, Wisconsin.
Allen-Bradley company profile
| Founded | 1903, Milwaukee, Wisconsin, USA, as the Compression Rheostat Company |
|---|---|
| Founders | Lynde Bradley (inventor of the compression rheostat, 1901) and Dr. Stanton Allen (investor); Harry Bradley joined in 1904 |
| Name | Allen-Bradley Company from 1909 |
| Ownership | Acquired by Rockwell International in 1985 for about USD 1.65 billion; a brand of Rockwell Automation (NYSE: ROK) since 2001 |
| Headquarters | Milwaukee, Wisconsin, USA |
| Product families | Logix programmable automation controllers (ControlLogix, CompactLogix), legacy SLC 500 and MicroLogix PLCs, Micro800 controllers, POINT, FLEX and Compact I/O, PanelView HMIs, PowerFlex AC drives, contactors, motor starters and soft starters, safety components, Stratix Ethernet switches |
Milestones
- 1901: Lynde Bradley invents the compression rheostat to control the speed of electric motors.
- 1903: The Compression Rheostat Company is formed in Milwaukee with an initial investment of USD 1,000.
- 1904: Harry Bradley joins; a crane controller is shown at the St. Louis World's Fair.
- 1909: The company is renamed Allen-Bradley.
- 1985: Rockwell International acquires Allen-Bradley.
- 2001: Rockwell Automation becomes the company's name; the Allen-Bradley brand marks 100 years in 2003.
Reading Allen-Bradley catalogue numbers
The first digits of an Allen-Bradley catalogue number identify the platform, which tells you what is compatible with what. 1756 is ControlLogix (chassis-based, used for large process and plant control), 1769 is CompactLogix 5370 with Compact I/O, 5069 is CompactLogix 5380 with Compact 5000 I/O, 1734 is POINT I/O, 1794 and 5094 are FLEX and FLEX 5000 distributed I/O, 1746 and 1747 belong to the older SLC 500 family, 1766 is MicroLogix 1400 and 2080 is Micro800. For drives, 25B is PowerFlex 525 and 22B is PowerFlex 40; in a code such as 25B-D010N114, "D" means 380–480 V, "010" is the output current rating, and N114 instead of N104 means the drive has an integrated EMC filter. Many plants in the region still run SLC 500 and older MicroLogix systems, which Rockwell has discontinued, so exact spares and migration to CompactLogix are both common requests.
Where Allen-Bradley products are used
In Oman and the GCC, Allen-Bradley controllers and drives run on oil and gas facilities, water treatment and pumping stations, cement, food and beverage and packaging plants, and on machines supplied by American OEMs. ControlLogix is often the platform for plant control systems, while PowerFlex drives are used on pumps, fans and conveyors.
Allen-Bradley products we list
| Family | Examples |
|---|---|
| ControlLogix | 1756-L85E, 1756-EN2T, 1756-EN2TR, 1756-IF16, 1756-IB32, 1756-PA75, 1756-A10 |
| CompactLogix and Micro controllers | 5069-L320ER, 5069-L340ERM, 1769-L33ER, 1769-L16ER, MicroLogix 1400, Micro820, SLC 500 (1746) |
| Distributed I/O | 1734-AENTR, 1734-IB8, 1734-IE2C, 1734-IB8S safety, 1794-AENTR, 5094-AENTR, 5069-IF8 |
| Operator terminals | PanelView Plus 7 10-inch, PanelView Plus 7 15-inch, PanelView 800, PanelView 5310 |
| Drives, motor control and networking | PowerFlex 525, PowerFlex 755, PowerFlex 4, 150-A180NBD SMC, Stratix 2000, 1783-NATR |
Ordering Allen-Bradley products: what we need
Send the full catalogue number and the series letter from the label (for example 1756-EN2T Series D), because firmware and compatibility can change between series. For drives, add the motor power, voltage and filter option. For a discontinued SLC 500 or MicroLogix part, tell us whether you need the exact spare or a migration proposal.
Facts checked against Rockwell Automation's published company history, October 2026.
Browse Allen-Bradley products by category: PLC & I/O Cards, AC Drives.
FAQ
Questions about the Allen-Bradley 1492-L4 Spring Clamp Feed-Through
Answers from our engineering team on installation, compatibility and integration.
01What is 1492-L4?
A one-circuit spring-clamp feed-through terminal block for wire up to #10 AWG.
02How wide is it?
6.1 mm.
03What is the current rating?
33 A for CSA and 35 A for IEC.
04What jumper fits?
1492-CJK6-1.
05What is the temperature range?
-50 to +120 C for the housing.
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