Brand: Allen-Bradley

Allen-Bradley 1492-JD3 2.5 mm2 Double-Level Terminal Block

Name: Allen-Bradley 1492-JD3 Double-Level Block | Seven Star LLC
Brand: Allen-Bradley
SKU: 1492-JD3

Description

Double-level block that halves rail length

The Allen-Bradley 1492-JD3 is a two-level, two-circuit terminal block for 2.5 mm2 conductors. Two independent circuits share one housing, one above the other, so a given number of circuits needs about half as much DIN rail as single-level blocks. The product page gives 5.1 mm width, 69 mm height and 55.5 mm depth.

Wire sizes printed are #22 to #12 AWG (UR), #26 to #12 AWG (CSA) and #20 to #14 AWG (ATEX), with an IEC rating of 2.5 mm2. The origin is Germany.

The catalog family includes related double-level variants, for example with ground or fuse functions; the JD3 is the plain version, and any additional function is a different catalog number. If you need a specific variant, tell us the full catalog number in the quotation request so that the correct item is quoted.

Density, fuse and SCCR data

At 5.1 mm width per two circuits, the effective spacing is 2.55 mm per circuit (derived). That is useful for I/O-heavy panels where signal conductors, sensor supplies and returns are wired in pairs.

The SCCR table lists the JD3 for 14 to 12 AWG with 30 A of Class J, T, G or CC protection, 600V and 100,000 A symmetrical.

Technical specifications

Parameter	Specification
Catalog number	1492-JD3
Type	Double-level, two-circuit terminal block, 2.5 mm2
Size (W x H x D)	5.1 x 69 x 55.5 mm
Wire size UR	#22 to #12 AWG
Wire size CSA	#26 to #12 AWG
IEC	2.5 mm2
ATEX	#20 to #14 AWG
Fuse/SCCR table	14-12 AWG; 30 A Class J/T/G/CC; 600V; 100 kA SCCR
Country of origin	Germany
Document	1492-TD015A

Practical use

Double-level blocks are common for sensors, where one level carries the signal and the other the supply, and for instruments that need two conductors per point. Because the two circuits are not linked internally, use jumpers if they need to be connected.

Check the end barriers and markers needed, which are ordered separately, and confirm that two-level wiring is acceptable under your panel standard and in the available depth: this block is deeper than the single-level J3 or J4.

Ordering and documents

Quote 1492-JD3 in full. Hosted document: 1492-TD015A. Dimensions and ratings above are as printed in that document and on the Rockwell product page.

Seven Star LLC is an independent supplier in Muscat and quotes on request; please confirm every rating against the current Rockwell documents before ordering.

Planning example, derived arithmetic only: 40 sensor points each with a signal and a supply line need 40 circuit pairs, which is 20 JD3 blocks, and these occupy about 102 mm of rail at 5.1 mm each, against roughly 204 mm if two single-level 5.1 mm blocks were used per point. Allow for the larger depth of 55.5 mm when you check the enclosure and wiring duct clearances.

A good inquiry for 1492-JD3 lists the number of points, the cable sizes, the panel standard and all accessories. We will check the list against the Rockwell documents and tell you if anything common, such as end barriers or jumpers, seems to be missing (2.5 mm2 double-level terminal block, 5.1 mm wide, 14-12 AWG, 600V, 100 kA SCCR).

Browse more items in Automation Accessories on our site, or send us the part number for a quotation.

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.