Siemens 3RW4424-1BC44 SIRIUS Soft Starter 47A 22kW
Introduction:
The 3RW4424-1BC44 is a SIRIUS soft starter from Siemens. It delivers 47A (22kW) standard or 81A (45kW) inside-delta for high-feature motor starting applications.
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Product Overview
The Siemens 3RW4424-1BC44 is a SIRIUS soft starter. This device belongs to the high-feature applications product family. It provides controlled motor starting and stopping for three-phase squirrel cage motors.
The soft starter includes an integrated bridging contact system and thyristors. Furthermore, it offers both standard and inside-delta circuit configurations. Therefore, this single device serves multiple motor power requirements.
General Specifications
The 3RW4424-1BC44 offers robust motor starting capabilities.
Manufacturer: Siemens.
Product Brand Name: SIRIUS.
Product Designation: Soft starter for high feature applications.
Product Equipment: Integrated bridging contact system, thyristors.
Item Designation (DIN EN 61346-2): Q.
Item Designation (DIN 40719): G.
Product Functions
The 3RW4424-1BC44 includes comprehensive protection and control features.
Intrinsic Device Protection: Yes.
Motor Overload Protection: Yes.
Evaluation of Thermal Resistor Motor Protection: Yes.
External Reset: Yes.
Adjustable Current Limitation: Yes.
Inside-Delta Circuit: Yes.
Outlet for Engine Brake: Yes.
Current Ratings
The 3RW4424-1BC44 delivers different current ratings based on temperature and configuration.
Standard Circuit Operating Current:
At 40°C: 47 A.
At 50°C: 42 A.
At 60°C: 37 A.
Inside-Delta Circuit Operating Current:
At 40°C: 81 A.
At 50°C: 73 A.
At 60°C: 64 A.
Continuous Operating Current:
115% of Ie at 40°C.
Minimum Load:
8% of I_M.
Adjustable Rated Current (Motor Overload Protection):
Minimum: 9 A.
Power Ratings
The 3RW4424-1BC44 delivers substantial mechanical power in both configurations.
Standard Circuit (40°C):
At 230V: 11 kW.
At 400V: 22 kW.
Inside-Delta Circuit (40°C):
At 230V: 22 kW.
At 400V: 45 kW.
UL/CSA Ratings (Standard Circuit at 50°C):
At 220/230V: 15 hp.
At 460/480V: 25 hp.
UL/CSA Ratings (Inside-Delta Circuit at 50°C):
At 200/208V: 20 hp.
At 220/230V: 25 hp.
At 460/480V: 50 hp.
Control Electronics
The 3RW4424-1BC44 requires a separate control supply.
Control Supply Voltage Type: AC.
Control Supply Voltage Value: 230 V AC.
Control Supply Voltage Frequency: 50/60 Hz.
Control Supply Voltage Tolerance (50/60 Hz): -15% / +10%.
Frequency Tolerance: -10% / +10%.
Power Loss
The 3RW4424-1BC44 operates efficiently with low power loss.
Active Power Loss (at operating current, 40°C, operating phase): 32 W typical.
Mechanical Dimensions
The 3RW4424-1BC44 has a compact footprint for panel mounting.
Width: 170 mm.
Height: 192 mm.
Depth: 270 mm.
Type of Mounting: Screw fixing.
Number of Poles (Main Current Circuit): 3.
Mounting Position:
±90° rotatable on vertical mounting plane.
±22.5° tiltable forward and backward on vertical mounting plane.
Clearance Distances:
Upwards: 100 mm.
Downwards: 75 mm.
Sidewards: 5 mm.
Installation Altitude:
Up to 5,000 meters above sea level.
Maximum Cable Length:
500 meters.
Electrical Connections
The 3RW4424-1BC44 provides flexible wiring options.
Main Current Circuit:
Connection Type: Box terminals.
Conductor Cross-Section (Front Clamping Point):
Solid: 2.5 to 16 mm².
Finely stranded (with end processing): 2.5 to 35 mm².
Finely stranded (without end processing): 4 to 50 mm².
Stranded: 4 to 70 mm².
Conductor Cross-Section (Back Clamping Point):
Solid: 2.5 to 16 mm².
Finely stranded (with end processing): 2.5 to 50 mm².
Stranded: 10 to 70 mm².
Auxiliary and Control Current Circuit:
Connection Type: Screw-type terminals.
Number of NC Contacts: 0.
Number of NO Contacts: 3.
Number of Changeover Contacts: 1.
Conductor Cross-Section (Auxiliary Contacts):
Solid: 2x (0.5 to 2.5 mm²).
Finely stranded (with end processing): 2x (0.5 to 1.5 mm²).
AWG: 2x (20 to 14).
UL/CSA Contact Rating (Auxiliary Contacts):
B300 / R300.
Display and Indication
The 3RW4424-1BC44 provides clear fault indication.
Type of Display for Fault Signal: Display (visual indication).
Ambient Conditions
The 3RW4424-1BC44 withstands typical industrial environments.
Operating Ambient Temperature: 60°C maximum.
Derating Temperature: 40°C (above this, current ratings derate).
Storage Temperature: -25°C to +80°C.
Protection Class: IP00.
Certifications and Approvals
The 3RW4424-1BC44 meets international standards.
UL/CSA Ratings: Yes (as specified above).
Key Features
The 3RW4424-1BC44 offers several advantages for motor starting applications.
Dual Configuration Flexibility:
The soft starter operates in standard circuit (47A, 22kW at 400V) or inside-delta circuit (81A, 45kW at 400V). Therefore, one device suits two different motor power requirements.
Integrated Motor Protection:
Provides motor overload protection and thermal resistor evaluation. Consequently, external overload relays may not be required.
Adjustable Current Limitation:
Limits starting current to reduce line disturbance. Hence, it protects both the motor and the electrical supply.
External Reset Capability:
Allows remote reset after a fault condition. Thus, operators can clear faults without opening the panel.
Wide Operating Voltage Range:
Operates from 200V to 460V AC with ±15%/-10% tolerance. Therefore, it accommodates line voltage variations.
High Continuous Overload Capacity:
Rated for 115% of Ie continuous at 40°C. Consequently, it handles temporary overloads without tripping.
UL/CSA Certified:
Approved for North American installations. Hence, it simplifies global machine certification.
Flexible Mounting Orientation:
Mounts at various angles (±90° rotation, ±22.5° tilt). Thus, it fits into tight enclosures.
Typical Applications
The 3RW4424-1BC44 suits various motor starting applications.
Pumps and compressors in industrial facilities.
Conveyor systems in material handling.
Fans and blowers in HVAC systems.
Mixers and agitators in processing plants.
Centrifuges and extruders in manufacturing.
Installation Guidelines
Install the 3RW4424-1BC44 on a vertical mounting plane using screw fixing. Ensure the mounting plane can support the device weight. Maintain minimum clearances: 100 mm upwards, 75 mm downwards, and 5 mm sidewards.
Connect the main circuit wiring using box terminals. Select conductor cross-sections based on the operating current and temperature. For 47A operation at 40°C, use appropriately rated cables. For inside-delta operation at 81A, use larger conductors (up to 70 mm² stranded).
Connect the control supply voltage of 230V AC (50/60 Hz). The control supply tolerance is -15%/+10%. Connect the auxiliary contacts (3 NO, 1 changeover) for status signaling.
For motor overload protection, set the adjustable rated current between 9A and the motor FLA. Configure the soft starter for standard or inside-delta operation based on the motor winding configuration.
What is in the Box
Please inspect all items upon delivery.
Siemens 3RW4424-1BC44 SIRIUS soft starter.
Screw terminals for main and auxiliary connections.
Installation instruction manual.
Frequently Asked Questions (FAQ)
1. What is the difference between standard and inside-delta operation?
In standard operation, the 3RW4424-1BC44 connects in series with each motor phase (47A, 22kW at 400V). In inside-delta operation, it connects inside the motor's delta winding (81A, 45kW at 400V). Therefore, inside-delta allows a smaller soft starter to control a larger motor.
2. What is the maximum cable length for this soft starter?
The 3RW4424-1BC44 supports a maximum cable length of 500 meters between the soft starter and the motor.
3. Does this soft starter provide motor overload protection?
Yes. The 3RW4424-1BC44 includes motor overload protection. It also evaluates thermal resistor motor protection inputs.
4. What is the control supply voltage requirement?
The 3RW4424-1BC44 requires 230V AC control supply voltage. The frequency can be 50 Hz or 60 Hz with a tolerance of -15%/+10%.
5. What is the ambient temperature rating of this device?
The 3RW4424-1BC44 operates at 60°C maximum. However, current ratings derate above 40°C. At 50°C, the standard circuit current reduces to 42A. At 60°C, it reduces to 37A.