Fuse Selection For Type 2 Coordination - Danfoss VLT MCD 600 Operating Manual

Operating Guide | VLT® Soft Starter MCD 600
Table 11: Circuit Breakers - High Fault Short-circuit Current
Model Nominal rating [A]
MCD6-0020B 24
MCD6-0034B 42
MCD6-0042B 52
MCD6-0063B 64
MCD6-0069B 69
MCD6-0086B 105
MCD6-0108B 115
MCD6-0129B 135
MCD6-0144B 184
MCD6-0171B 200
MCD6-0194B 229
MCD6-0244B 250
MCDF6-0287B 352
MCD6-0323B 397
MCD6-0410B 410
MCD6-0527B 550
MCD6-0579B 580
1
Suitable for use on a circuit capable of delivering not more than 65000 rms symmetrical amperes, 480 V AC maximum, when protected by circuit breaker models listed in this table.
2
For LS circuit breakers, xx represents FM, FT, or AT.

3.14 Fuse Selection for Type 2 Coordination

Type 2 coordination is achieved by using semiconductor fuses. These fuses must be able to carry motor start current and have a total
2 2
clearing I t less than the I t of the soft starter SCRs.
When selecting semiconductor fuses for VLT® Soft Starter MCD 600, use the I
For further information on selecting semiconductor fuses, contact the local distributor.
Table 12: SCR Values for Semiconductor Fuses
Model
MCD6-0020B
MCD6-0034B
MCD6-0042B
MCD6-0063B
MCD6-0069B
Danfoss A/S © 2018.10
Breaker 1: Eaton (rating, A)
HFD3030 (30 A)
HFD3050 (50 A)
HFD3060 (60 A)
HFD3100 (100 A)
HFD3125 (125 A)
HFD3150 (150 A)
HFD3250 (250 A)
HFD3300 (300 A)
HFD3400 (400 A)
HFD3600 (600 A)
(1) Breaker 2: GE (rating, A)
SELA36AT0060 (60 A)
SELA36AT0150 (150 A)
SELA36AT0250 (250 A)
SELA36AT0400 (400 A)
SELA36AT0600 (600 A)
2
t values in table 12.
2 2
SCR I t [A s]
1150
7200
15000
AQ262141844215en-000202 / 175R1174 | 23
System Design
(1) Breaker 3: LS (rating, A)
UTS150H-xxU-040 (40 A)
UTS150H-xxU-050 (50 A)
UTS150H-xxU-060 (60 A)
UTS150H-xxU-100 (100 A)
UTS150H-xxU-125 (125 A)
UTS150H-xxU-150 (150 A)
UTS150H-xxU-250 (250 A)
UTS150H-xxU-300 (300 A)
UTS150H-xxU-400 (400 A)
UTS150H-xxU-600 (600 A)
UTS150H-xxU-800 (800 A)
UTS150H-NG0-800
(1) (2)