NEMA Terminal Block Accessories
AccessoriesMounting Rails
Mounting rails allow many blocks to be fastened in a panel with only a few screws to anchor the rail to the panel. Mounting rails allow easy installation and removal of a block in a row.
End Anchor/End Retainers
End anchors and end retainers mount at both ends of a group of terminal blocks to add rigidity to the terminal assembly and prevent sliding along the rails.
End Barriers
End barriers are required to provide the necessary insulation for the last terminal block in a group.
Fanning Strips
Fanning strips, used with the Cat. No. 1492-CA1, -CA2, and -CAM2 terminal blocks, keep wires in an orderly row and allow easy disconnect and reconnect of multiple adjacent wires.
Side Jumpers
Side jumpers use the terminal block wire openings. Muli-pole jumpers can be cut into a smaller number of poles. 2-pole jumpers are also available for some blocks. All jumpers except the 1492-N21 carry 100% of rated terminal block current. The 1492-N21 carries 100 A. The backs of IEC-style jumpers are insulated with plastic. An adjacent partition plate provides the necessary electrical spacings between adjacent jumpers or between exposed ends of cut jumpers.
Marking Systems
Various marking systems are available to simplify circuit identification. NEMA blocks come with a painted surface; IEC blocks use snap-in markers. Markers are available in blank form for hand writing, pre-printed in ascending number format, or custom printed for unique requirements. Extended marking strips and adhesive labels are available for long circuit identifications. A group marking carrier for easy group terminal block identification is also available. Marking rods can be used with QuickClamp style terminal blocks to simplify mass solutions. Pre-printed, single-digit, alphanumeric marker tabs are also available.
Specifications/Agency Approvals
In general, accessories for terminal blocks are not eligible for recognition by UL, CSA, or other third-party approval agencies. The suitability of the installation must be judged in the end use application due to the wide variety of possible uses. However, accessories are designed to meet, and are tested to, the terminal block assembly requirements such as electrical spacings, etc.
Product Selection
DIN Mounting Rails
| Cat. No. | Description | Pkg Qty. | Dimensions¬ |
| 199-DR1 | DIN (#3) Symmetrical Rail 35 mm x 7.5 mm x 1 m long Zinc-plated, yellow chromated EN50022 DIN #3 |
10 |
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| 199-DR2 | Same as 199-DR1, but length = 2 m | 100 | |
| ¬ Dimensions shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. | |||
Allen-Bradley Mounting Rails
NEMA/EEMAC Mounting Rails
| Cat. No. | Description | Pkg. Qty. | Dimensions¬ |
| 1492-N1 | Breakaway Mounting Rail — 3 ft (0.91 m) long; scored every 0.203 in. (5.2 mm) so it will break off to the desired length | 20 |
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| 1492-N22 | Rigid Mounting Rail — 3 ft (0.91 m) long | 20 |
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| 1492-N25 | Mounting Rail Standoff Brackets — Used with Cat. No. 1492‑N22 rigid mounting rail | 20 |
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| ¬ Dimensions shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. | |||
Stacking Bridge Kits
| 1492-N26 | 1492-N32 | 1492-N27 | 1492-N28 | 1492-N29 | |||||
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| Description | Description | Description | Description | Description | |||||
| External Mounting Feet | Internal Mounting Feet | Side Plate Extensions | 18 in Bridge | 12 in Bridge | |||||
| Cat. No. | Pkg. Quantity | Cat. No. | Pkg. Quantity | Cat. No. | Pkg. Quantity | Cat. No. | Pkg. Quantity | Cat. No. | Pkg. Quantity |
| 1492-N26 | 1 Kit | 1492-N32 | 1 Kit | 1492-N27 | 1 Kit | 1492-N28 | 1 | 1492-N29 | 1 |
Description — Stacking bridges are used with Style C, F, and H rail-mounted terminal blocks. They are designed to save panel space and increase terminal accessibility. Stacking bridge kits allow stacking of up to four terminal block strips. A stacking bridge consists of mounting feet, side plate extensions, and 12 in. or 18. in bridges.
Note:Rigid mounting rail is attached to the bridge. Five kits are available to custom build stacking bridges as listed in the above table. Fuse blocks, disconnect blocks, large Style C terminal blocks (Cat. No. 1492-CE2) and circuit breakers should only be mounted on the upper-most bridge of any assembly.
Ordering Example — A typical ordering example for a Two-Level 18 in. Stacking Bridge is as follows:
Both 12 in. and 18 in. stacking bridges are built in this manner with up to four levels maximum.
Stacking Bridge
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| Stacking Bridge Size | A | B | C | D | E | F | G | H | |||
| No. of Levels | |||||||||||
| 1 | 2 | 3 | 4 | ||||||||
| 12 in. | 12.06 (306.3) | 18.06 (458.7) | 17 (431.8) | 15.19 (385.8) | 12.69 (322.3) | 10.97 (278.6) | 14.53 (369.1) | 2.34 (59.5) | 4.50 (114.3) | 6.63 (168.4) | 8.78 (223.0) |
| 18 in. | 18.63 (473.2) | 24.06 (611.1) | 23 (584.2) | 21.19 (538.2) | 18.69 (474.7) | 16.97 (431.0) | 20.53 (521.5) | 2.34 (59.5) | 4.50 (114.3) | 6.63 (168.4) | 8.78 (223.0) |
| Note:Dimensions in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. | |||||||||||
End Anchors
1492-EAH35
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1492-N2
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1492-N23
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1492-N47
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1492-15A, 1492-25A
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1492-15E, 1492-25E
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| Cat. No. | A | B | C | D | E |
| 1492-15A | 1.5 in. (38.1 mm) | 1.03 in. (26.2 mm) | 0.594 in. (15.1 mm) | 0.234 in. (5.9 mm) | 0.75 in. (19.1 mm) |
| 1492-15E | 1.5 in. (38.1 mm) | 1.03 in. (26.2 mm) | 0.594 in. (15.1 mm) | 0.234 in. (5.9 mm) | — |
| 1492-25A | 1.88 in. (47.8 mm) | 1.19 in. (30.2 mm) | 0.688 in. (17.5 mm) | 0.203 in. (5.2 mm) | 0.97 in. (24.6 mm) |
| 1492-25E | 1.88 in. (47.8 mm) | 1.19 in. (30.2 mm) | 0.688 in. (17.5 mm) | 0.234 in. (5.9 mm) | — |
Side Jumpers/Fanning Strip/General Accessories¬
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¬ The 1492-SJS Insulating Sleeve reduces exposure to live parts on the 1492-N39 and 1492-N49. The 1492-SJS used with the 1492-N39 and 1492-H1 or 1492-HM1 provides IEC 947 IP2X finger protection.
Fuse Puller
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Screwdriver and Marking Pen
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Isolation Switch Plugs Cat. No. 1492-ISOSW-1
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Test Plug/Test Sockets
Cat. No. 1492-TP28
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Test Plug/Test Sockets, Continued
Cat. No. 1492-TA285
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Cat. Nos. 1492-TA40, 1492-TA40L
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Cat. No. 1492-TP15
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Cat. No. 1492-TP23
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Marking Systems
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Note:The center and the corners of Cat. No. 1492-R terminal blocks may be labelled using a Cat. No. 1492-MR9 marking rod, or Cat. No. 1492-AL9 label, or both. For maximum marking space, Cat. No. 1492-MR15 can be used with or without Cat. No. 1492-AL15 in the center of the block (this will cover the center jumper area).
Placement of Label on Holder
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| Cat. No. | Pkg Qty. |
| 1492-ALHFB | 1 |
| 1492-ALWFB | 1 |
| 1492-N4 | 1 |
| 1492-N5 | 1 |
| 1492-N8 | 25 |
| 1492-N41 | 50 |
| 1492-N43 | 1 |
| 1492-N45 | 20 |
| 1492-N901 | 50 |
| 1492-N4350 | 1 |
| 1492-N43100 | 1 |
| 1492-MR9 (Not Shown) | 25 |
| 1492-MR15 (Not Shown) | 25 |
Marker Cards
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| Cat. No. | No. of Labels/Card |
| 1492-MS8X12 | 70 |
| 1492-MN81 | — |
| 1492-MN83 | — |
Specifications/Agency Approvals
Multiple Wire Connection Combination for Stranded Copper Conductors of the Same Gross Section for Allen-Bradley Terminal Blocks
| Terminal Blocks | ||||||
| Cat. No. | Wire Size AWG (mm2) | |||||
| #22 | #20 (0.5) | #18 (0.75) | #16 (1.5) | #14 (2.5) | #12 (4) | |
| Number of the Same-Size Wires Per Terminal | ||||||
| 1492-H4, -H5, -H6, -H7 | 4 | 4 | 3 | 2 | 2 | 1 |
| Fingersafe Terminal Blocks | |||||||||
| Cat. No. | Fingersafe Terminal Blocks | ||||||||
| #22 | #20 (0.5) | #18 (0.75) | #16 (1.5) | #14 (2.5) | #12 (4) | #10 (6) | #8 (10) | ||
| Number of the Same-Size Wires Per Terminal | |||||||||
| ¬ | 1492-HM1 | 4 | 4 | 3 | 2 | 2 | 1 | — | — |
| ¬ | 1492-HM2 | 4 | 4 | 3 | 2 | 2 | 1 | — | — |
| 1492-HC6 | 4 | 4 | 3 | 2 | 2 | 1 | — | — | |
| ¬ | 1492-HM3 | 4 | 4 | 4 | 3 | 2 | 2 | 1 | 1 |
| ¬ Dimensions for other colors are identical. | |||||||||
NEMA and IEC Terminal Block Component Specifications¬
Tie Point Terminal Blocks — Type HM2C and WD4C
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The total current flow through these terminal blocks (the sum of all inputs or the sum of all outputs) must not exceed the rated current for the device. |
| Description | Type | Rating |
| Maximum Total Current Flow Through the Terminal Block | H2C, HM2C | 10 A |
| Maximum Working Voltage | H2C, HM2C | 600V |
| Operating Ambient Temperature Range | All | -4…+104 °F (-20…+40 °C) |
| Storage Temperature Range | All | -40…+167 °F (-40…+75 °C) |
Diode Terminal Blocks — Types H2D, HHM2D, WD2D, WD2DR, RD3DF and RD3DR
| Description | Symbol | Type | Rating |
| Peak Repetitive Reverse Voltage | V (RRM) | H2D, HM2D | 600V |
| Working Peak Reverse Voltage | V (RWM) V (R) |
RD3DF, RD3DR WD4DF, WD4DR |
300V |
| Non-Repetitive Peak Reverse Voltage (Halfwave, single-phase, 60 Hz) | V (RSM) | H2D, HM2D | 600V |
| RMS Reverse VoltageT | V (Rms) | H2D, HM2D | 600V |
| Average Rectified Forward Current Single-Phase, Resistive Load, 60 Hz | I (O) | All | 1.0 A |
| Non-Repetitive Peak Surge Current (Surge applied at rated load) | I (FSM) | All | 30 A (1 cycle) |
| Maximum Forward Voltage Drop [I (f) = 1.0 A] | V (F) | All | 1.1V |
| Maximum Reverse Current | I (R) | All | 10 mA |
| Operating Ambient Temperature Range | T (A) | All | –4…+104 °F (–20…+40 °C) |
| Storage Temperature Range | T (S) | All | –40…+167 °F (–40…+75 °C) |
| T The maximum voltage rating of the diode terminal blocks listed in the above table should not be exceeded even through the maximum reverse voltage rating of the diode alone is 1000V. | |||
All parameters measured at 77 °F (25 °C).
Resistor Terminal Blocks — Types H2RA, H2RB, H2RC, HM2RA, HM2RB, HM3RB¬
| Description | Model Code Identifier | Rating |
| Resistor Type | A | Carbon Fixed Resistor‡ |
| B | Metal Film Resistor§ | |
| C | Wire Wound Precision Resistor | |
| Standard Resistance Range | A | 1.0 (W)…100 M (W) |
| B | 1.0 (W)…4.75 M (W) | |
| C | 249 (W) | |
| Resistance Tolerance | A | ± 5% |
| B | ± 1% | |
| C | ± 1% | |
| Power Rating (Resistor) Maximum Continuous Watts at 86 °F (30 °C) Ambient |
A | 0.5 W |
| B | 0.25 W | |
| C | 0.5 W | |
| Rated Continuous Working Voltage (Resistor) | A | 0.5 x R or 300V Max. |
| B | 0.25 x R or 250V Max. | |
| C | 0.5 x R or 250V Max. | |
| Operating Ambient Temperature Range | All | –4…+104 °F (–20…+40 °C) |
| Storage Temperature Range | All | –40…+167 °F (–40…+75 °C) |
| Dielectric Withstanding Voltage (Resistor) | A | 700V |
| B & C | 500V | |
| ¬ Performance Data — See this catalog, ImportantPerformance Data. | ||
| ‡ The power rating of the resistor block operating in ambient temperatures of 86…104 °F (30…40 °C) should be derated for maximum resistor life. The derating curve is linear between 86 °F (30 °C) and 104 °F (40 °C) where the power rating is 100% of specified power at 86 °F (30 °C) and 85% at 104 °F (40 °C). | ||
| § For further information on resistor performance, consult your local Rockwell Automation sales office or Allen-Bradley distributor. | ||
Resistor Codes for 1492-RD3RB…, -H2RB… and -HM2RB Terminal Blocks
Ordering Information
In order to complete the cat. no. for 1492-RD3RB…, 1492-H2RB, and 1492-HM2RB, add the desired resistor code from the table below.
Example: Cat. No. 1492-RD3RB101 is a resistor terminal block with a 100 (W) — 1/4 W resistor.
| Resistor Value W |
Resistor Code | Resistor Value W |
Resistor Code | Resistor Value W |
Resistor Code | Resistor Value W |
Resistor Code |
| 10 11 12.1 13 15 16 18.2 20 22.1 24.3 26.7 30.1 33.2 35.7 39.2 43.2 47.5 51.1 56.2 61.9 68.1 75 82.5 90.9 100 110 121 130 150 162 182 200 221 243 |
100 110 120 130 150 160 180 200 220 240 270 300 330 360 390 430 470 510 560 620 680 750 820 910 101 111 121 131 151 161 181 201 221 241 |
267 301 332 357 392 432 475 511 562 619 681 750 825 909 1000 1100 1210 1300 1500 1620 1820 2000 2210 2430 2670 2940 3320 3570 3920 4750 5110 5620 6810 7500 |
271 301 331 361 391 431 471 511 561 621 681 751 821 910 102 112 122 132 152 162 182 202 222 242 272 302 332 362 392 472 512 562 682 752 |
8250 9090 10 000 11 000 12 100 13 000 15 000 16 200 18 200 20 000 22 100 24 300 26 700 30 100 33 200 35 700 39 200 43 200 47 500 51 100 56 200 61 900 68 100 75 000 82 500 90 900 0.10M 0.11M 0.121M 0.13M 0.15M 0.162M 0.182M 0.20M |
822 912 103 113 123 133 153 163 183 203 223 243 273 303 333 363 393 433 473 513 563 623 683 753 823 913 104 114 124 134 154 164 184 204 |
0.221M 0.243M 0.267M 0.301M 0.332M 0.357M 0.392M 0.432M 0.475M 0.511M 0.562M 0.619M 0.681M 0.75M 0.825M 0.909M 1.0M 1.1M 1.24M 1.3M 1.5M 1.62M 1.82M 2.0M 2.21M 2.43M 2.67M 3.01M 3.32M 3.57M 3.92M 4.32M 4.75M 249 |
224 244 274 304 334 364 394 434 474 514 564 624 684 754 824 914 105 115 125 135 155 165 185 205 225 245 275 305 335 365 395 435 475 001 |
Resistor Codes for 1492-H2RA… and -HM2RA Terminal Blocks
Ordering Information
In order to complete the cat. no. for 1492-H2RA… and 1492-HM2RA, add the desired resistor code from the table below. Example: Cat. No. 1492-H2RA101 is a resistor terminal block with a 100 (W) — 1/2 W resistor.
| Resistor Value W |
Resistor Code | Resistor Value W |
Resistor Code | Resistor Value W |
Resistor Code | Resistor Value W |
Resistor Code | Resistor Value W |
Resistor Code |
| 1.0 1.1 1.2 1.3 1.5 1.6 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1 10 11 12 13 15 16 18 20 22 24 27 30 33 36 39 |
10G 11G 12G 13G 15G 16G 18G 20G 22G 24G 27G 30G 33G 36G 39G 43G 47G 51G 56G 62G 68G 75G 82G 91G 100 110 120 130 150 160 180 200 220 240 270 300 330 360 390 |
43 47 51 56 62 68 75 82 91 100 110 120 130 150 160 180 200 220 240 270 300 330 360 390 430 470 510 560 620 680 750 820 910 1000 1100 1200 1300 1500 1600 |
430 470 510 560 620 680 750 820 910 101 111 121 131 151 161 181 201 221 241 271 301 331 361 391 431 471 511 561 621 681 751 821 911 102 112 122 132 152 162 |
1800 2000 2200 2400 2700 3000 3300 3600 3900 4300 4700 5100 5600 6200 6800 7500 8200 9100 10 000 11 000 56 200 12 000 13 000 15 000 18 000 20 000 22 000 24 000 27 000 30 000 33 000 36 000 39 000 43 000 47 000 51 000 56 000 62 000 68 000 |
182 202 222 242 272 302 332 362 392 432 472 512 562 622 682 752 822 912 103 113 123 133 153 163 183 203 223 243 273 303 333 363 393 433 473 513 563 623 683 |
75000 82000 91000 0.10M 0.11M 0.12M 0.13M 0.15M 0.16M 0.18M 0.20M 0.22M 0.24M 0.27M 0.30M 0.33M 0.36M 0.39M 0.43M 0.47M 0.51M 0.56M 0.62M 0.68M 0.75M 0.82M 0.91M 1.0M 1.1M 1.2M 1.3M 1.5M 1.6M 1.8M 2.0M 2.2M 2.4M 2.7M |
753 823 913 104 114 124 134 154 164 184 204 224 244 274 304 334 364 394 434 474 514 564 624 684 754 824 914 105 115 125 135 155 165 185 205 225 245 275 305 |
3.3M 3.6M 3.9M 4.3M 4.7M 5.1M 5.6M 6.2M 6.8M 7.5M 8.2M 9.1M 10M 11M 12M 13M 15M 16M 18M 20M 22M 24M 27M 30M 33M 36M 39M 43M 47M 51M 56M 62M 68M 75M 82M 91M 100M |
335 365 395 435 475 515 565 625 685 755 825 915 106 116 126 136 156 166 186 206 226 246 276 306 336 366 396 436 476 516 566 626 686 756 826 916 107 |
Surge Suppressor Performance Characteristics and Electrical Component Data¬
| Surge Suppressor Terminal Blocks | |||
| Performance Characteristic |
Cat. No. | ||
| 1492-H2K024 1492-HM2K024 |
1492-H2K120 1492-HM2K120 |
1492-H2K240 1492-HM2K240 |
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| Nominal Working Voltage (Volts AC or DC) [V] | 24 | 120 | 240 |
| Maximum AC Working Voltage RMS Continuous (60 Hz) [V] | 30 | 140 | 275 |
| Maximum DC Working Voltage Continuous [V] | 38 | 160 | 369 |
| Maximum Clamping Voltage at Current lp (8/20 ms pulse) [V] | 92V Ip = 6 A | 360V Ip = 14 A | 710V Ip = 17 A |
| Maximum Voltage Rate of Rise Bulletin 100 Contactors Types A38…B180 Bulletin 500 Contactors & Starters, Size 0…5 Bulletin 700 Relays |
— | <10 V/ms | <10 V/ms |
| Peak Current (8/20 ms pulse) | 250 A | 150 A | 150 A |
| Typical Leakage Current at Nominal AC Working Voltage | 1.0 mA | 4.5 mA | 10.0 mA |
| Metal Oxide Varistor (MOV) Maximum Clamping Voltage at Current lp (8/20 ms Pulse) Maximum Transient Energy Maximum Power Dissipation |
— | — | — |
| ¬ Performance Data — See this catalog, ImportantPerformance Data. Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of accelerated testing at elevated stress levels and the user should correlate it to actual application requirements. Actual performance is subject to WARRANTY and LIMIT OF LIABILITY. |
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Component Specifications
| Characteristic | Suppressor Cat. No. | ||
| 1492-H2K024 1492-HM2K024 |
1492-H2K120 1492-HM2K120 |
1492-H2K240 1492-HM2K240 |
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| Capacitor Nominal Value Tolerance Maximum DC Working Voltage |
0.10 mF ±20% 500V DC |
0.10 mF ±20% 500V DC |
0.10 mF ±20% 500V DC |
| Metal Oxide Varistor (MOV) Maximum Clamping Voltage at Current Ip (8/20 ms Pulse) Maximum Transient Energy Maximum Power Dissipation |
92V Ip = 5 A 1.8 J 0.25 W |
360V Ip = 10 A 12 J 0.25 W |
710V Ip = 10 A 23 J 0.25 W |
| Resistor Nominal Value Tolerance Power Rating |
100 W ±20% 2 W at 104 °F (40 °C) |
100 W ±20% 2 W at 104 °F (40 °C) |
100 W ±20% 2 W at 104 °F (40 °C) |
Technical Specifications for Fuse PlugsT
| Characteristic | 1492-FP4 | 1492-FP424 | 1492-FP4250 |
| Indicator Type | Non-Indicating | LED | Neon |
| Leakage Current | — | 2 mA @ 24V | 1 mA @ 264V |
| Working Voltage | Per Fuse Rating | 10…57V AC/DC | 85…264V AC |
| Fuse Size (Not Supplied) | 5 x 20 mm | ||
| T Maximum current rating for the fuse plug is 10 A at 250V. IEC standards for 5 x 20 mm fuses do not include ratings above 6.3 A. | |||
UL/CSA File and Guide Numbers
| Base Cat. No. | UL Number | CSA Number | ||
| File | Guide | File | Class | |
| 1492-CA, -CE, -CD | E40735 | XCFR2 | LR67896 | 622801 |
| 1492-CB | E65138 | QVNU2 | LR37712 | 9091-01 |
| 1492-CE6 | E34648 | IZLT2 | LR67896 | 622801 |
| 1492-F | E40735 | XCFR2 | LR67896 | 622801 |
| 1492-FB | E34646 | IZLT | LR70915 | 622501 |
| 1492-H1, -H2, -HM1, -HM2, -HM3 | E40735 | XCFR2 | LR67896 | 622801 |
| 1492-H4, -H5, -H6, -H7 | E40735 | XCFR2 | LR67896 | 622801 |
| 1492-HC6, -HJ | E40735 | XCFR2 | LR67896 | 622801 |