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Safety
Rating
Mechanical
Information
Data
Installation
Model
IS4x0700B
IS4x0820B
IS4x0920B
IS4x1000B
IS3x0255N
IS4x0360N
IS4x0430N
IS4x0650N
IS4x0790N
IS4x0930N
IS561200N
IS561410N
IS561600N
4.4.2
Control supply fuses
The following table lists the recommended control supply fuses. It is recommended that you use slow blow fuses which allow a 10A,
0.01 second surge.
Fuse type
Ferraz Shawmut
Bussman
4.5
Bypass contactor
Some Digistart IS soft starters are internally bypassed and do not require an external bypass contactor.
Non-bypassed soft starters may be installed with an external bypass contactor. Select a contactor with an AC1 rating greater than or
equal to the full load current rating of the connected motor.
Internally bypassed models:
IS1x0023B, IS1x0043B, IS1x0053B, IS1x0076B, IS1x0097B, IS1x0105B, IS2x0145B, IS2x0170B, IS2x0200B, IS2x0220B,
IS3x0255B, IS4x0350B, IS4x0425B, IS4x0500B, IS4x0700B, IS4x0820B, IS4x0920B, IS4x1000B
Non-bypassed models:
IS3x0255N, IS4x0360N, IS4x0430N, IS4x0650N, IS4x0790N, IS4x0930N, IS561200N, IS561410N, IS561600N
4.6
Main contactor
A main contactor must be installed if the Digistart IS is connected to the motor in inside delta format and is optional for in-line
connection. Select a contactor with an AC3 rating greater than or equal to the full load current rating of the connected motor.
4.7
Circuit breaker
A shunt trip circuit breaker may be used instead of a main contactor to isolate the motor circuit in the event of a soft starter trip. The
shunt trip mechanism must be powered from the supply side of the circuit breaker or from a separate control supply.
4.8
Power factor correction
If power factor correction is used, a dedicated contactor should be used to switch in the capacitors.
Power factor correction capacitors must be connected to the input side of the soft starter. Connecting power factor
correction capacitors to the output side will damage the soft starter.
CAUTION
30
Electrical
Keypad
Quick Start
Installation
and
Commissioning
Status
2
2
SCR I
t (A
s)
Supply Voltage
781000
1200000
2530000
2530000
320000
320000
320000
1200000
2530000
4500000
A4BQ1200 / A4BT1100
4500000
6480000
12500000
A4BQ2500 / A4BT1800
Class J 1A
IEC aM 1A
Class J 1A
IEC aM 1A
www.controltechniques.com
Operation Programming Diagnostics Application
Supply Voltage
(< 440 Vac)
(< 575 Vac)
A4BQ800
A4BQ800
A4BQ1200
A4BQ1200
A4BQ1200
A4BQ1200
A4BQ1200
A4BQ1200
AJT300
AJT300
AJT400
AJT400
AJT450
AJT450
A4BQ800
A4BQ800
A4BQ1200
A4BQ1200
A4BQ1200 / A4BT1100
A4BQ1600
A4BQ1600
A4BQ2000
A4BQ2000
A4BQ2500 / A4BT1800
AJT1 (North America)
16511-G (10x38)
17511-G (14x51)
15511-G (8x31)
LPJ-1SP (North America)
C08M1 (8x32)
C10M1 (10x38)
C14M1 (14x51)
Technical
Maintenance Options
Examples
Data
Supply Voltage
(< 690 Vac)
Not suitable
Not suitable
Part Number
Digistart IS User Guide
Issue: 4
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