Bulletin 1491 Fuse Blocks 2 Bulletin 1491 30 A Fuse Blocks with Spring-Type Fuse Clips and Self-Lifting Wiring Terminal Clamps 30 A Fuse Blocks with Spring-Type Fuse Clips Class R Rejection Feature and Self-Lifting Wiring Terminal Clamps 60 A Fuse Blocks with Spring-Type Fuse Clips and Tang-Type Connections on the Wiring Terminals 100 A Fuse Blocks with Wedge-Type Fuse Clamps and Tang-Type Connections on the Wiring Terminals • Fuse Blocks • Available from 30…600 A • Can be Used with Class H, J, and R Fuses TABLE OF CONTENTS Description Page Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Description Page Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 Approximate Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 Description These Bulletin 1491 Fuse Blocks have been designed for general purpose applications. The bases of these blocks, either phenolic or porcelain, are rugged in construction and provide ease in mounting and wiring. Conformity to Standards: Approvals: NEMA 512 CSA Certified (File No. LR 1234) UL Listed (File No. E 34648) 2-31 Bulletin 1491 Fuse Blocks Product Selection Fuse Blocks Maximum Voltage (V) No. of Poles Class CC Cat. No. Class H Cat. No. Class J Cat. No. Class R Cat. No. Class C (HRC Form II) Cat. No. 250 1 2 3 — 1491-N121 1491-N122 1491-N125 — — — 1491-R125 — 600 1 2 3 — 1491-R162 — 1491-N161 — 1491-N126 — — 1491-N126 — — 1491-R126 — — 1491-E126 250 3 — 1491-N226 — 1491-R226 — 600 3 — 1491-N266 1491-N266 1491-R266 1491-E126 61…100 250…600 1 2 3 — 1491-N321 ➊ ➋ 1491-N333 1491-N321 ➊ ➋ 1491-N333 — — 1491-R333 — — 1491-E333 101…200 250…600 1 2 3 — 1491-N421 ➌ 1491-N433 1491-N421 ➌ 1491-N433 — — 1491-R433 — — 1491-E433 201…400 250…600 1 2 3 — 1491-N521 ➍ ➎ 1491-N521 ➍ ➎ 1491-R523 — — 1491-E521 — — 401…600 250…600 1 2 3 — 1491-N621 ➏ ➐ 1491-N621 — ➐ 1491-R621 ➑ ➒ — Fuse Size (A) 0…30 31…60 ➊ ➋ ➌ ➍ ➎ ➏ ➐ ➑ ➒ These fuse blocks have porcelain bases. For 2-pole applications use two of Cat. No. 1491-N321. For 2-pole applications use two of Cat. No. 1491-N421. For 2-pole applications use two of Cat. No. 1491-N521. For 3-pole applications use three of Cat. No. 1491-N521. For 2-pole applications use two of Cat. No. 1491-N621. For 3-pole applications use three of Cat. No. 1491-N621. For 2-pole applications use two of Cat. No. 1491-R621. For 3-pole applications use three of Cat. No. 1491-R621. Specifications — Page 2-34 Approximate Dimensions — Page 2-35 2-32 Bulletin 1491 Fuse Blocks Accessories Fuse Clip Kits Includes six clips and mounting hardware Fuse Class H H, J H, J H, J H, J H, J R R R R R R Fuse Clip Rating (A) 250V 600V 30 60 — 100 200 400 30 60 — 100 200 400 — 30 60 100 200 400 — 30 60 100 200 400 Cat. No. 1401-N41 1401-N42 1401-N43 1401-N44 1401-N45 1401-N46 ➊ 1401-N50 1401-N51 1401-N52 1401-N53 1401-N54 1401-N55 Lugs Description Lug Connectors (3 per package) Cat. No. 1494R-N3 For Use with Cat. No. Cat. No. Disconnect Size (A) Wire Size 30 #14…#8 AWG Wire ➊ 60 #14…#4 AWG Wire 1494R-N1 100 #8…#1/0 AWG Wire 1491 Fuse Blocks 1494R-N2 200 #6…#4/0 AWG Wire 400 2 of #1/0…350 MCM Wire 1494R-N10 600 2 of #1/0…350 MCM Wire 1494R-N11 1494R-N3 ➊ All terminals of the 30 A switches are furnished with self-lifting pressure plate connectors as standard. 2-33 Bulletin 1491 Fuse Blocks Specifications Fuse Blocks Electrical UL Fuse Type Class C Class CC Class H Class J Class R CSA Fuse Type HRCI-C HRCI-Misc. HRCI-H HRCI-J HRCI-R Maximum Fuse Cartridge Size Maximum Voltage 30…600 A 30 A 30…600 A 30…600 A 30…600 A AC 600V 600V 600V 600V 600V DC 250V 250V 250V 250V 250V 30…600 A 30 A 30…600 A 30…600 A 30…600 A 100 kA 200 kA 10 kA 100 kA 200 kA IP00 Thermal Current Rating Maximum Short Circuit Prospective Fault Current Mechanical Degree of Protection Terminal Capacity IP00 IP00 IP00 IP00 mm 2 10 6 10 10 10 AWG #8 (–500 MCM) #10 #8 (–500 MCM) #8 (–500 MCM) #8 (–500 MCM) Construction Fuse Clips Tin-plated copper alloy Terminals Tin-plated copper alloy Fuse Block Base Phenolic or Porcelain Environmental Ambient Temperature Altitude (per IEC 947-5) Relative Humidity (per IEC 947-3) Product Selection — Page 2-32 2-34 Open –20…+55°C (–4…+131°F) Enclosed –20…+40°C (–4…+104°F) Storage –40…+65°C (–40…+149°F) 2000m 90% at 20°C and 50% at 40°C Bulletin 1491 Fuse Blocks Approximate Dimensions Fuse Size 1…30 A Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. 1…30 A, Single Pole, 600V Cat. No. 1491-N161 Shipping Weight — 1 lb (0.45 kg) Cat. No. 1491-R162 1…30 A, 2-Pole, 250V Cat. No. 1491-N122 Shipping Weight — 2 lb (0.91 kg) 1…30 A, 250…600V Cat. No. 1491-R125 (250V) Cat. No. 1491-R126 (600V) Shipping Weight — 1 lb (0.45 kg) 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 Class J Voltage (V) A B 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) B — 3 (76.2) Fuse Size (A) 1…30 A➋ ±0.020 B Ref. 1491-R125 2.94 (74.68) 2-1/8 (53.97) 1491-R126 5.72 (145.29) 2-3/8 (60.33) Maximum Volts (V) Cat. No. 250 600 ➊ Alternate mounting holes. ➋ 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. 2-35 Bulletin 1491 Fuse Blocks Approximate Dimensions, Continued Fuse Size 31…60 A Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. 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-N266 (600V) Shipping Weight — 2 lb (0.91 kg) Voltage (V) 250 600 Class H A B 2-3/8 (60.3) 3-3/4 (95.3) 2-11/16 (68.3) 6-1/4 (158.8) Cat. No. 1491-R266 (600V) Shipping Weight — 2 lb (0.91 kg) Class J A B — — 2-11/16 (68.3) 3-1/8 (79.4) 3-Pole Application Use Three of Cat. No. 1491-N321 Approximate Shipping Weight — Approx. 3 times wt. of 1-Pole 250 600 31…60 Maximum Volts (V) 250 600 Cat. No. 1491-R226 1491-R266 B Ref. 2-3/8 (60.33) 2-11/16 (68.26) 4-Pole Application Use Four of Cat. No. 1491-N321 Approximate Shipping Weight — Approx. 3 times wt. of 1-Pole Class H A 82.6 (3-1/4) 85.7 (3-3/8) A➋ ±0.020 3.72 (94.49) 6.22 (157.99) 2-Pole Application Use Two of Cat. No. 1491-N321 Approximate Shipping Weight — Approx. 2 times wt. of 1-Pole Single Pole Application Use One of Cat. No. 1491-N321 Approximate Shipping Weight — 2 lb (0.91 kg) Voltage (V) Fuse Size (A) Class J B 174.6 (6-7/8) 225.4 (8-7/8) A — 82.6 (3-1/4) B — 142.9 (5-5/8) ➊ Alternate Mounting Holes. ➋ 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. 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. 2-36 Bulletin 1491 Fuse Blocks Approximate Dimensions, Continued Fuse Size 61…100 A Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. 3-Pole Cat. No. 1491-N333 Approximate Shipping Weight — 3 lb (1.36 kg) Voltage (V) Class H Class J 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) 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 A➊ ±0.020 B Ref. 5.88 (149.35) 2-15/16 (74.61) 7.88 (200.15) 3-1/8 (79.38) ➊ 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. 2-37 Bulletin 1491 Fuse Blocks Approximate Dimensions, Continued Fuse Size 101…200 A Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. Fuse Size (A) 101…200 Maximum Volts (V) 250 600 Cat. No. 1491-R433 A➊ ±0.020 B Ref. 7.25 (184.15) 4-3/16 (106.36) 9.75 (247.60) 4-5/16 (109.54) 101…200 A, 250…600V Cat. No. 1491-R433 Shipping Weight — 7 lb (3.2 kg) 2-Pole Application Use Two of Cat. No. 1491-N521 Shipping Weight — 6kg (13 lb) Single Pole Cat. No. 1491-N521 Shipping Weight — 7 lb (3.2 kg) 3-Pole Application Use Three of Cat. No. 1491-N521 Shipping Weight — 19 lb (8.6 kg) Voltage (V) 4-Pole Application Use Four of Cat. No. 1491-N521 Shipping Weight — 25 lb (11.4 kg) Class H or R Class J 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) ➊ 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. 2-38 Bulletin 1491 Fuse Blocks Approximate Dimensions, Continued Fuse Size 201…400 A Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. 201…400 A, 250…600V Cat. No. 1491-R523 Shipping Weight — 19 lb (8.6 kg) Fuse Size (A) 201…400 Maximum Volts (V) Cat. No. 250 1491-R523 600 A➊ ±0.020 B Ref. 9 (228.60) 4-3/4 (120.70) 12 (304.80) 4-61/64 (125.81) Fuse Size 401…600 A Single Pole 600 A Terminations Only Cat. No. 1491-N621 Shipping Weight — 6 lb (2.7 kg) Voltage (V) Class H or R Class J 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) ➊ 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. 2-39 Bulletin 1491 Fuse Blocks Approximate Dimensions, Continued Fuse Size 401…600 A, Continued Dimensions are shown in inches (millimeters). Dimensions are not intended to be used for manufacturing purposes. 2-Pole 400 A Terminations Only Cat. No. 1491-N621 (Amt. 2) Shipping Weight — 11 lb (5 kg) 3-Pole 400 A Terminations Only Cat. No. 1491-N621 (Amt. 3) Shipping Weight — 16 lb (7.3 kg) 4-Pole 400 A Terminations Only Cat. No. 1491-N621 (Amt. 4) Shipping Weight — 21 lb (9.5 kg) 2-40