Technical Data

Fuse Block Specifications Bulletin Number 1491 Topic

Page

1491 Specifications

this page

Fuse Size 1…30 A — Approximate Dimensions

2

Fuse Size 31…60 A — Approximate Dimensions

3

Fuse Size 61…100 A — Approximate Dimensions

4

Fuse Size 101…200 A — Approximate Dimensions

5

Fuse Size 201…400 A — Approximate Dimensions

6

Fuse Size 401…600 A — Approximate Dimensions

6…7

Specifications Electrical UL Fuse Type Maximum Fuse Cartridge Size Maximum Voltage

AC/DC

Thermal Current Rating Maximu Short Circuit Prospective Fault Current

Class H

Class J

Class R

Class C

30…600 A

30…600 A

30…600 A

30…600 A

Class CC 30 A

600V/250V

600V/250V

600V/250V

600V/250V

600V/250V

30…600 A

30…600 A

30…600 A

30…600 A

30 A

10 kA

200 kA

200 kA

100 kA

200 kA

Construction Fuse Clips

Tin-plated copper

Terminals

Tin-plated copper

Fuse Block Base

Phenolic or porcelain Environmental

Ambient Temperature

Open Enclosed Storage

-20…+55 °C (-4…+131 °F) -20…+40 °C (-4…+104 °F) -40…+65 °C (-40…+149 °F)

Altitude (per IEC 947-5) Relative Humidity (per IEC 947-3)

2000 m 90% @ 20 °C (68 °F) and 50% @ 40 °C (104 °F)

Additional Resources These documents contain additional information concerning related products from Rockwell Automation. Resource

Description

Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

Provides general guidelines for installing a Rockwell Automation industrial system.

Product Certifications website, http://www.ab.com

Provides declarations of conformity, certificates, and other certification details.

You can view or download publications at http://www.rockwellautomation.com/literature/. To order paper copies of technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales representative.

1491 Fuse Blocks

Approximate Dimensions

Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.

Fuse Size 1…30 A

9/32 (7.1) Dia. Drill & Tap 2 Holes for #10…32 Screws

2 Holes 0.172 (4.37) Dia. Rejection Feature

4 Terminals Combination of: Double Quick-Connect (0.250x0.032) 20 A Max., and Pressure Plate Screw (10…32 Sems). (Ref.) Wire: #10 AWG Max. Cu Only

1…30 A, Single Pole, 600V Cat. No. 1491-N161 Shipping Weight — 1 lb (0.45 kg)

Cat. No. 1491-R162

Drill & Tap 2 Holes for #10…32 Screws

1…30 A, 2-Pole, 250V Cat. No. 1491-N122 Shipping Weight — 2 lb (0.91 kg)

Drill & Tap 4 Holes for #10…32 Screws

Drill & Tap for #10…32 Screws

Rejection Members

1…30 A, 3-Pole, 250…600V Cat. No. 1491-N125 (250V) Cat. No. 1491-N126 (600V) Shipping Weight — 1 lb (0.45 kg) Class H

1…30 A, 250…600V Cat. No. 1491-R125 (250V) Cat. No. 1491-R126 (600V) Shipping Weight — 1 lb (0.45 kg) Class J

Voltage [V]

A

250

2-1/8 (54.0)

3 (76.2)

—

—

600

2-3/8 (60.3)

5-3/4 (146.1)

2-3/8 (60.3)

3 (76.2)

 Alternate mounting holes.

B

A

B

Fuse Size [A] 1…30

B Ref.

Cat. No.

250

1491-R125

2.94 (74.68)

2-1/8 (53.97)

600

1491-R126

5.72 (145.29)

2-3/8 (60.33)

‡ Dimension “A” must be held to insure fuse block rejection function.

Note: When fuse blocks are installed in a vertical plane, the block with the rejection numbers must be on the bottom.

2

A‡ ±0.020

Maximum Volts [V]

Rockwell Automation Publication 1491-TD001A-EN-P

Approximate Dimensions

1491 Fuse Blocks

Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.

Fuse Size 31…60 A Drill & Tap 4 Holes for #10…32 Screws

Drill & Tap for #10…32 Screws

Rejection Members

31…600 A, 3-Pole, 250…600V Cat. No. 1491-N226 (250V) Shipping Weight — 1 lb (0.45 kg)

31…60 A, 250…600V Cat. No. 1491-R226 (250V) Shipping Weight — 1 lb (0.45 kg) Cat. No. 1491-R266 (600V) Shipping Weight — 2 lb (0.91 kg)

Cat. No. 1491-N266 (600V) Shipping Weight — 2 lb (0.91 kg) Voltage [V]

Class H A

Class J B

A

B

250

2-3/8 (60.3)

3-3/4 (95.3)

—

—

600

2-11/16 (68.3)

6-1/4 (158.8)

2-11/16 (68.3)

3-1/8 (79.4)

Fuse Size [A] 31…60

A‡ ±0.020

B Ref.

Maximum Volts [V]

Cat. No.

250

1491-R226

3.72 (94.49)

2-3/8 (60.33)

600

1491-R266

6.22 (157.99)

2-11/16 (68.26)

‡ Dimension “A” must be held to insure fuse block rejection function.

 Alternate mounting holes.

Drill & Tap 6 Holes for 1/4-20 Screws

Drill & Tap 4 Holes for 1/4-20 Screws

Single Pole Application Use (1) of Cat. No. 1491-N321 Approximate Shipping Weight — 2 lb (0.91 kg)

2-Pole Application Use (2) of Cat. No. 1491-N321 Approximate Shipping Weight — Approx. 2 times wt. of 1-Pole

Drill & Tap 8 Holes for 1/4-20 Screws

Drill & Tap 10 Holes for 1/4-20 Screws

3-Pole Application Use (3) of Cat. No. 1491-N321 Approximate Shipping Weight — Approx. 3 times wt. of 1-Pole

4-Pole Application Use (4) of Cat. No. 1491-N321 Approximate Shipping Weight — Approx. 3 times wt. of 1-Pole

Class H

Class J

Voltage [V]

A

B

A

B

250

82.6 (3-1/4)

174.6 (6-7/8)

—

—

600

85.7 (3-3/8)

225.4 (8-7/8)

82.6 (3-1/4)

142.9 (5-5/8)

Notes: 1. When fuse blocks are installed in a vertical plane, the block with the rejection numbers must be on the bottom. 2. When using Cat. No. 1491-N321, install fiber washers between fuse blocks and mounting plates. Discard extra screws, washers, and clamps on multiple pole applications.

Rockwell Automation Publication 1491-TD001A-EN-P

3

1491 Fuse Blocks

Approximate Dimensions

Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.

Fuse Size 61…100 A Drill & Tap 4 Holes for 1/4-20 Screws

3-Pole Cat. No. 1491-N333 Approximate Shipping Weight — 3 lb (1.36 kg) Class H

Class J

Voltage [V]

A

B

A

B

250

2-15/16 (74.6)

5-7/8 (149.2)

—

—

600

3-1/8 (79.4)

7-7/8 (200.0)

3 (76.2)

4-5/8 (117.5)

Drill & Tap for 1/4-20 Screws

Rejection Members

13/32 max. (10.32 max.)

61…100 A, 250…600V Cat. No. 1491-R333 Shipping Weight — 3 lb (1.36 kg) Fuse Size [A] 61…100

Maximum Volts [V] 250 600

Cat. No. 1491-R333

A ±0.020

B Ref.

5.88 (149.35)

2-15/16 (74.61)

7.88 (200.15)

3-1/8 (79.38)

 Dimension “A” must be held to insure fuse block rejection function. Notes 1. When fuse blocks are installed in a vertical plane, the block with the rejection numbers must be on the bottom. 2. Fuse blocks with wedge type clamps (61 A and above) can be oriented to mount all fuses either to the left or to the right of fuse clamp centers.

4

Rockwell Automation Publication 1491-TD001A-EN-P

Approximate Dimensions

1491 Fuse Blocks

Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.

Fuse Size 101…200 A

Fuse Size [A]

Drill & Tap for 5/16-18 Screw

101…200

Maximum Volts [V] 250

1491-R433

600

A ±0.020

B Ref.

7.25 (184.15)

4-3/16 (106.36)

9.75 (247.60)

4-5/16 (109.54)

Cat. No.

 Dimension “A” must be held to insure fuse block rejection function.

Rejection Members

Drill for 5/16-18 Screw 19/32 max. (15.1 max.)

101…200 A, 250…600V Cat. No. 1491-R433 Shipping Weight — 7 lb (3.2 kg)

Drill for 5/16-18 Screw

3-Pole Application Use Three of Cat. No. 1491-N521 Shipping Weight — 19 lb (8.6 kg) Single Pole Cat. No. 1491-N521 Shipping Weight — 7 lb (3.2 kg)

Drill for 5/16-18 Screw

Drill for 5/16-18 Screw

2-Pole Application Use Two of Cat. No. 1491-N521 Shipping Weight — 6kg (13 lb)

4-Pole Application Use Four of Cat. No. 1491-N521 Shipping Weight — 25 lb (11.4 kg) Class H or R

Class J

Voltage [V]

A

B

A

B

250

4-3/4 (120.7)

9 (228.6)

—

—

600

4-61/64 (125.8)

12 (304.80)

4-5/8 (117.5)

7-1/2 (190.5)

Note: When fuse blocks are installed in a vertical plane, the block with the rejection numbers must be on the bottom. Rockwell Automation Publication 1491-TD001A-EN-P

5

1491 Fuse Blocks

Approximate Dimensions

Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.

Fuse Size 201…400 A

Drill & Tap for 5/16-18 Screws

Rejection Members

1/4 max. (6.35 max.)

201…400 A, 250…600V Cat. No. 1491-R523 Shipping Weight — 19 lb (8.6 kg) Maximum Volts [V]

Fuse Size [A]

Cat. No.

250

201…400

1491-R523

600

A ±0.020

B Ref.

9 (228.60)

4-3/4 (120.70)

12 (304.80)

4-61/64 (125.81)

 Dimension “A” must be held to insure fuse block rejection function.

Fuse Size 401…600 A

Single Pole 600 A Terminations Only Cat. No. 1491-N621 Shipping Weight — 6 lb (2.7 kg) Class H or R

Class J

Voltage [V]

A

B

A

B

250

8-1/8 (206.38)

4-5/8 (117.47)

—

—

600

11-1/8 (282.57)

7-5/8 (193.68)

6 (127.00)

2-1/2 (63.50)

Notes 1. When fuse blocks are installed in a vertical plane, the block with the rejection numbers must be on the bottom. 2. Fuse blocks with wedge type clamps (61 A and above) can be oriented to mount all fuses either to the left or to the right of fuse clamp centers.

6

Rockwell Automation Publication 1491-TD001A-EN-P

Approximate Dimensions

1491 Fuse Blocks

Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes.

Fuse Size 401…600 A, Continued

401…600 A 250V 401…600 A 600V

Drill for 5/16-18 Screw

401…600 A 250V 401…600 A 600V

2-Pole 400 A Terminations Only Cat. No. 1491-N621 (Amt. 2) Shipping Weight — 11 lb (5 kg)

401…600 A 250V 401…600 A 600V

401…600 A 250V Drill for 5/16-18 Screw

401…600 A 600V

3-Pole 400 A Terminations Only Cat. No. 1491-N621 (Amt. 3) Shipping Weight — 16 lb (7.3 kg)

401…600 A 250V 401…600 A 600V

Drill for 5/16-18 Screw

401…600 A 250V 401…600 A 600V

4-Pole 400 A Terminations Only Cat. No. 1491-N621 (Amt. 4) Shipping Weight — 21 lb (9.5 kg)

Rockwell Automation Publication 1491-TD001A-EN-P

7

Important User Information Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards. Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of practice. If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment. The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams. No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual. Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.

Documentation Feedback Your comments will help us serve your documentation needs better. If you have any suggestions on how to improve this document, complete this form, publication RA-DU002, available at http://www.rockwellautomation.com/literature/.

Allen-Bradley, Rockwell Software, Rockwell Automation, and LISTEN. THINK. SOLVE are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies.

Rockwell Otomasyon Ticaret A.Ş., Kar Plaza İş Merkezi E Blok Kat:6 34752 İçerenköy, İstanbul, Tel: +90 (216) 5698400

Publication 1491-TD001A-EN-P - August 2014 Copyright © 2014 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.