MD500 User Manual 13. EMC
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13.6 Breaker & Fuse Selection
The earth leakage current of the AC drive is larger than 3.5 A, requiring grounding protection.
The AC drive produces DC leakage current inside protective conductor, thus a B-type (delay-type) leakage breaker must be used.
When the leakage breaker acts accidentally, you can:
ƕ Use a leakage breaker of higher rated action current or use a delay-type leakage breaker.
ƕ Lower the carrier frequency of the AC drive.
ƕ Shorten the length of drive cables of the motor.
ƕ Take leakage current suppression measures.
The recommended leakage breaker manufacturers are CHINT and Schneider.
The following table is the selection guidance of the breaker, contactor and fuse.
AC Drive Model Recommended Fuse Bussmann FWH
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Contactor Breaker
Rated Current
(A)
Model Rated Current
(A)
Rated Current
(A)
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MD500T18.5G 80 FWH-80B 65 80
MD500T22G 100 FWH-100B 65 80
MD500T30G 100 FWH-100B 65 80
MD500T37G 125 FWH-125B 80 100
MD500T45G 150 FWH-150B 160
MD500T55G 200 FWH-200B 115 160
MD500T75G 250 FWH-250B 150 250
0'7* 275 FWH-275B 170 250
MD500T110G 325 FWH-325B 205 400
MD500T132 400 FWH-400B 245
MD500T160 500 FWH-500B 300
MD500T200 600 FWH-600B 410
MD500T220 700 FWH-700B 410
MD500T250 800 FWH-800B 475
MD500T280 800 FWH-800B 620
MD500T315 1000 FWH-1000B 620
MD500T355 1000 FWH-1000B 620
MD500T400 1200 FWH-1200B 800
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