Siemens SIRIUS 3RW55 - 1.7 Selection Using Simulation Tool

1)
For the pxb applications, pressure and 󹪞ow rate monitoring are additionally required for the
overpressure encapsulation systems.
Type of motor connection "Standard" (inline)
Note that operation of a 3RW55 soft starter in the motor connection type "Standard" without
implementing one of the two following remedial measures for the following line voltages results
in loss of certi󹪝ed motor overload protection according to ATEX/IECEx (does not apply to 3RW55
Failsafe soft starters):
• Soft starter 200 - 480 V: for line voltage > 440 V (+10%)
• Soft starter 200 - 600 V: for line voltage > 500 V (+10%)
• Soft starter 200 - 690 V: for line voltage > 560 V (+10%)
Depending on the structure of the circuit, choose one of the following possibilities for ensuring
certi󹪝ed motor overload protection according to ATEX / IECEx:
• Use an additional line contactor in the main circuit.
Connect the line contactor at outputs 95, 96 and 98 (output 3).
You will 󹪝nd more information in chapter Type of motor connection "Standard" (inline) in Ex
operation (Page 305).
• For a motor feeder con󹪝guration with a circuit breaker, use an additional undervoltage trip
unit.
Connect the undervoltage trip unit at outputs 95, 96 and 98 (output 3).
You will 󹪝nd more information in chapter Connecting (Page 71).
The motor connection type "Automatic detection" is not approved for ATEX/IECEx applications.
Type of motor connection "Inside delta"
Note that operation of a 3RW55 or 3RW55 Failsafe soft starter with motor connection type
"Inside-delta" without implementing one of the two following remedial measures results in loss
of certi󹪝ed motor overload protection according to ATEX/IECEx:
Depending on the structure of the circuit, choose one of the following possibilities for ensuring
certi󹪝ed motor overload protection according to ATEX / IECEx:
• Use an additional line contactor in the main circuit (in the supply cable or in the delta
connection).
Connect the line contactor at outputs 95, 96 and 98 (output 3).
You will 󹪝nd more information in chapter Type of motor connection "inside delta" in Ex
operation (Page 307).
• For a motor feeder con󹪝guration with a circuit breaker, use an additional undervoltage trip
unit.
Connect the undervoltage trip unit at outputs 95, 96 and 98 (output 3).
You will 󹪝nd more information in chapter Connecting (Page 71).
The motor connection type "Automatic detection" is not approved for ATEX/IECEx applications.
Safety information
2.6 ATEX / IECEx
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006 19