Nidec Digistart D4 User Manual

System Design
3.10 Short Circuit Protection Devices (SCPD)
Fuses may be installed to protect the soft starter or the installation.
Type 1 Coordination
Type 1 coordination requires that, in the event of a short circuit on the output side of a soft
starter, the fault must be cleared without risk of injury to personnel. There is no requirement
that the soft starter must remain operational after the fault.
HRC fuses (such as Ferraz/Mersen AJT fuses) can be used for Type 1 coordination
according to IEC 60947-4-2 standard.
Type 2 Coordination
Type 2 coordination requires that in the event of a short circuit on the output side of a soft
starter, the fault must be cleared without risk of injury to personnel or damage to the soft
starter.
Semiconductor fuses for Type 2 circuit protection are additional to HRC fuses or MCCBs
that form part of the motor branch circuit protection.
CAUTION
Integral solid state short circuit protection does not provide branch circuit protection.
Branch circuit protection must be provided in accordance with the National Electrical
Code and any additional local codes.
3.11 IEC Coordination with Short Circuit Protection Devices
These fuses were selected based on start current of 300% FLC for 10 seconds.
Model
Nominal
Rating (A)
SCR I
2
t (A
2
s)
Type 1
coordination
480 VAC, 65 kA
Bussmann
NH fuse links
Type 2
coordination
600 VAC, 65 kA
Bussmann
DIN 43 653
0024B
24
1150
40NHG000B
170M3010
0042B
42
7200
63NHG000B
170M3013
0052B
52
80NHG000B
0064B
64
15000 100NHG000B 170M3014
0069B
69
0105B
105
80000 170M3015
0115B
115
160NHG00B
0135B
135
125000
170M3016
0184B
184
320000
250NHG2B
0200B
200
170M3020
0229B
229
315NHG2B
0250B
250
170M3021
0352B
352
202000
355NHG2B
170M6009
0397B
397
400NHG2B
0410B
410
320000
425NHG2B
170M6010
0550B
550
781000 630NHG3B 170M6012
0580B
580
13

Nidec Digistart D4 Specifications

General

Brand	Nidec
Model	Digistart D4
Category	Controller
Language	English