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| Selecting The Correct Motor Starter |
| Short Circuit Co-ordination |
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The back up fuses quoted give Type 2 co-ordination (as defined in BS EN 60947-4-1) such that after an extremely heavy short circuit the risk of welded contacts is accepted but the starter must be suitable for further service after the weld has been broken. In selected cases it is possible to use Memshield 2 miniature circuit breakers to provide similar back up protection for automatic starters. |
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Relay Current Range (A) |
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Fuse, Eaton MEM 'S' Types (A) |
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3-phase |
0.22-0.33 0.33-0.50 0.50-0.74 0.74-1.11 1.11-1.66 1.66-2.50 2.50-3.70 3.70-5.60 5.60-8.40 8.40-11.90 11.40-16.00 16.00-23.00 22.00-33.00 |
2 2 4 6 6 10 16 20 20M25 20M32 32M40 32M50 63M80 |
MCH306 MCH306 MCH306 MCH306 MCH306 MCH306 MCH310 MCH316 MCH320 MCH320 MCH340 MCH340 MCH363 |
MDH306 MDH306 MDH306 MDH306 MDH306 MDH306 MDH306 MDH310 MDH316 MDH320 MDH332 MDH332 MDH340 |
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single-phase |
1.11-1.66 1.66-2.50 2.50-3.70 3.70-5.60 5.60-8.40 8.40-11.90 11.40-16.00 |
6 10 16 20 20M25 20M32 32M40 |
MCH106 MCH110 MCH110 MCH116 MCH120 MCH132 MCH150 |
MDH106 MDH106 MDH106 MDH110 MDH116 MDH120 MDH132 |
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3-phase |
6.40-9.70 9.70-14.50 14.50-20.60 19.70-27.70 26.00-38.00 38.00-57.00 |
20 20M25 20M32 32M40 32M63 63M80 |
MCH316 MCH320 MCH340 MCH350 MCH363 - |
MDH316 MDH320 MDH332 MDH332 - - |
| Current range must be selected to include actual motor rated full load current. |
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Max. HRC Fuse Eaton MEM 'S' Type, (A) |
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30DSB 37DSB 55DSB 90DSB |
100M160 100M160 200 250 |
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45YSB 55YSB 75YSB 90YSB |
63M100 100M160 100M160 200 |
| Eaton MEM can provide type 2 co-ordination data for Eaton MEM fuses and other manufacturers motor starter combinations in accordance with the latest IEC recommendations. |
 Selecting The Correct Motor Starter - Main
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The Guide - Main Menu |
