Fuse Selection, Class 20 W39 Heater, Fuse Selection Chart, 3 Phase Motor Fuse Selection Table
Tech Tip
NEMA STARTER and FUSE SELECTION
Type "2" Protection (UL Verified)
| Motor HP 3 phase | Allen-Bradley Starter |
Allen-Bradley Starter |
Heater Element | Bussmann Low-Peak Yellow™ Fuse Max. Ampere |
Bussmann Low-Peak Yellow™ Fuse 125% FLA˛ |
Bussmann Low-Peak Yellow™ Fuse 125% FLA˛ |
|
| 460V | 575V | NEMA Size | Basic Cat. # * | Cat. # ** | Type 2 | ||
| - | 5 | 0 | 509-A | W47 | 12 | LPS-RK-8SP | LPJ-8SP |
| 5 | - | 0 | 509-A | W49 | 15 | LPS-RK-10SP | LPJ-10SP |
| - | 7-1/2 | 1 | 509-B | W51 | 20 | LPS-RK-12SP | LPJ-12SP |
| 7-1/2 | 10 | 1 | 509-B | W53 | 20 | LPS-RK-15SP | LPJ-15SP |
| 10 | - | 1 | 509-B | W56 | 30 | ||
| - | 15 | 2 | 509-C | W58 | 35 | LPS-RK-25SP | LPJ-25SP |
| 15 | 20 | 2 | 509-C | W61 | 50 | LPS-RK-30SP | LPJ-30SP |
| 20 | 25 | 2 | 509-C | W63 | 60 | LPS-RK-35SP | LPJ-35SP |
| 25 | - | 2 | 509-C | W66 | 60 | LPS-RK-45SP | LPJ-45SP |
| - | 30 | 3 | 509-D | W64 | 70 | LPS-RK-40SP | LPJ-40SP |
| 30 | - | 3 | 509-D | W66 | 90 | LPS-RK-50SP | LPJ-50SP |
| - | 40 | 3 | 509-D | W66 | 90 | LPS-RK-60SP | LPJ-60SP |
| 40 | 50 | 3 | 509-D | W69 | 100 | LPS-RK-70SP | LPJ-70SP |
| 50 | - | 3 | 509-D | W72 | 100 | LPS-RK-90SP | LPJ-90SP |
| - | 60 | 4 | 509-E | W71 | 100 | LPS-RK-80SP | LPJ-80SP |
| 60 | 75 | 4 | 509-E | W74 | 125 | LPS-RK-100SP | LPJ-100SP |
| 75 | - | 4 | 509-E | W77 | 175 | LPS-RK-125SP | LPJ-125SP |
| - | 100 | 4 | 509-E | W78 | 175 | LPS-RK-125SP | LPJ-125SP |
| 100 | - | 4 | 509-E | W82 | 200 | LPS-RK-175SP | LPJ-175SP |
| - | 125 | 5 | 509-F | W35 | 200 | LPS-RK-175SP | LPJ-175SP |
| - | 150 | 5 | 509-F | W36 | 200 | LPS-RK-200SP | LPJ-200SP |
| 125 | - | 5 | 509-F | W37 | 200 | LPS-RK-200SP | LPJ-200SP |
| 150 | - | 5 | 509-F | W39 | 250 | LPS-RK-225SP | LPJ-225SP |
| - | 200 | 5 | 509-F | W40 | 300 | LPS-RK-250SP | LPJ-250SP |
| 200 | - | 5 | 509-F | W42 | 400 | LPS-RK-300SP | LPJ-300SP |
* Catalog number is not complete.
Refer to Bulletin 509 section of A-B Industrial Control Catalog to
specify complete catalog starter number.
** Class 20 heater elements have been selected for motors with a marked service factor of 1.15 or
greater, with the same ambient temperature at the controller and the motor. For other applications,
refer to Element Selection section of A-B Industrial Control Catalog.
˛ Refer to Bussmann "Electrical Protection Handbook" (SPD) for more information on motor circuit
protection.
For applications below 460V, single phase systems, and larger HP ratings, contact Bussmann.
Testing per IEC Standard 947-4-1.
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BUSS_AB (orig.-8/1/02)
