Siemens 3RW4422-1BC44 SIRIUS Soft Starter Overview

The Siemens 3RW4422-1BC44 is a SIRIUS soft starter with an integrated bypass contact system. This device uses thyristors for controlled motor starting and stopping. It operates at 200 to 460V AC with a control supply voltage of 230V AC. In addition, the 3RW4422-1BC44 includes screw terminals for easy wiring connections. It features motor overload protection and thermistor motor protection evaluation. An external reset function and adjustable current limitation are also provided. Furthermore, this soft starter includes a motor brake output for additional control flexibility.

Current & Power Ratings

The Siemens 3RW4422-1BC44 offers two connection configurations for different power requirements. In standard circuit at 400V and 40°C, operating current is 29A with mechanical power output of 15kW. Meanwhile, inside-delta circuit at 400V and 40°C provides 50A operating current with 22kW mechanical power output. At 50°C, the standard circuit current derates to 26A while inside-delta current derates to 45A. Similarly, at 60°C, standard circuit current becomes 23A and inside-delta current becomes 40A.

Turning to UL/CSA ratings for North American applications, several configurations are available. For 460/480V with standard circuit, output is 15 hp at 50°C. In contrast, the same voltage with inside-delta circuit reaches 30 hp at 50°C. For 220/230V standard circuit, output measures 7.5 hp at 50°C. By comparison, 220/230V with inside-delta circuit delivers 15 hp at 50°C. Consequently, the 3RW4422-1BC44 adapts to various global power systems.

Control & Protection Features

The Siemens 3RW4422-1BC44 provides comprehensive motor protection features. For example, intrinsic device protection prevents damage to the soft starter itself. Likewise, motor overload protection is built-in for the connected motor. Additionally, evaluation of thermistor motor protection (PTC) is supported for thermal monitoring. An external reset function allows remote fault clearing from a control room. Adjustable current limitation lets you set the maximum starting current as needed.

Moreover, the integrated bypass contact system reduces power dissipation during continuous operation. As a result, power loss is only 8W at rated operating current. The 3RW4422-1BC44 also supports inside-delta circuit connection for higher power output from the same frame size. Therefore, you get more power without increasing panel space.

Electrical Specifications

The Siemens 3RW4422-1BC44 operates reliably on standard industrial power systems. Operating frequency ranges from 50 to 60 Hz with ±10% tolerance. Similarly, operating voltage tolerance spans -15% to +10% for both standard and inside-delta circuits. Minimum load requirement is 8% of rated current for proper switching operation. Adjustable motor current for overload protection starts at 5A minimum. Furthermore, continuous operating current capacity reaches 115% of Ie at 40°C for temporary overloads.

Control supply voltage is 230V AC at both 50 Hz and 60 Hz frequencies. Control supply voltage tolerance is -15% to +10% for reliable operation despite fluctuations. Consequently, the 3RW4422-1BC44 works in facilities with unstable power quality.

Mechanical & Mounting Specifications

The Siemens 3RW4422-1BC44 features a compact design for efficient panel installation. Width measures 170 mm, height measures 192 mm, and depth measures 270 mm. Mounting type is screw fixing with vertical mounting surface orientation. The unit can rotate ±90° and tilt ±22.5° to the front and back for installation flexibility. Required spacing for side-by-side mounting is 100 mm upward, 75 mm downward, and only 5 mm to the side. Therefore, multiple units can be mounted closely together to save panel space.

Maximum wire length reaches 500 m between the soft starter and the motor. The 3RW4422-1BC44 has 3 poles for the main current circuit connection. Auxiliary contacts include 3 NO contacts and 1 CO contact with no NC contacts. As a result, external signaling and interlocking are well supported.

Terminal & Wiring Specifications

The Siemens 3RW4422-1BC44 uses box terminals for main current connections. Screw-type terminals are used for auxiliary and control circuits. Main contact wiring options include solid wire from 2.5 to 16 mm². Meanwhile, finely stranded wire with core end processing accepts 2.5 to 35 mm². Finely stranded wire without processing accepts 4 to 50 mm². In addition, stranded wire accepts 4 to 70 mm². AWG conductors from 10 to 2/0 are supported for North American installations. Dual wire connections are also possible for many wire types.

Turning to auxiliary contact wiring, solid wire up to 2x (0.5 to 2.5 mm²) is supported. Finely stranded wire with core end processing accepts 2x (0.5 to 1.5 mm²). AWG conductors for auxiliary contacts accept 2x (20 to 14) for solid wire. Finally, contact rating of auxiliary contacts according to UL is B300/R300.

Environmental & Ambient Conditions

The Siemens 3RW4422-1BC44 withstands demanding industrial environments. Operating ambient temperature reaches 60°C maximum for reliable performance. Derating begins at 40°C as shown in the current ratings table. Storage temperature ranges from -25°C to +80°C for warehouse conditions. Installation altitude can reach 5000 m above sea level without performance loss. Protection class is IP00 for open panel mounting applications.

Environmental categories meet IEC 60721 standards for transport, storage, and operation. These include 3K6 (no ice or condensation), 3C3 (no salt mist), and 3S2 (sand protection). Furthermore, 3M6 mechanical condition ratings ensure vibration resistance. Consequently, the 3RW4422-1BC44 suits most industrial environments.

Key Features & Benefits

• Integrated bypass contactor – The 3RW4422-1BC44 reduces heat generation during continuous running.

• Dual connection modes – Standard circuit offers 29A, while inside-delta offers 50A at 400V.

• Comprehensive motor protection – Includes overload, thermistor, and adjustable current limitation.

• External reset capability – Allows remote fault clearing for operator convenience.

• Motor brake output – Provides direct control of external braking devices.

• Flexible mounting options – Rotates ±90° and tilts ±22.5° for panel installation ease.

Installation Guidelines

Follow these steps to install the Siemens 3RW4422-1BC44 correctly. First, mount the unit vertically on a flat surface using screw fixing. Second, maintain minimum spacing of 100 mm above and 75 mm below for cooling. Third, connect the 3-phase mains supply to the input terminals with proper torque. Fourth, connect the motor leads to the output terminals according to your circuit type. Fifth, wire the 230V AC control supply to the appropriate terminals. Finally, configure the adjustable parameters for your specific motor application.

For inside-delta connection, follow the dedicated wiring diagram in the manual. Do not exceed the maximum operating current ratings at your ambient temperature. Likewise, use the correct wire sizes from the specifications table. The 3RW4422-1BC44 requires no external bypass contactor due to the integrated bypass system.

Package Contents

Your shipment includes the following items:

• 1 x Siemens 3RW4422-1BC44 SIRIUS soft starter

• 1 x Installation manual with wiring diagrams and settings

• 1 x Terminal label sheet for connection identification

• 1 x Mounting screw kit for panel installation

No external bypass contactor is needed since the 3RW4422-1BC44 includes an integrated bypass. Similarly, no communication modules are provided with this base model.

Frequently Asked Questions (FAQ)

1. What is the advantage of inside-delta connection?
Inside-delta connection allows the 3RW4422-1BC44 to handle higher motor current. At 400V, it increases from 29A (15kW) to 50A (22kW) using the same device.

2. Does this soft starter require an external bypass contactor?
No. The Siemens 3RW4422-1BC44 has an integrated bypass contactor. Therefore, no external contactor is needed for continuous operation.

3. What type of motor protection is included?
The 3RW4422-1BC44 includes motor overload protection and thermistor (PTC) evaluation. Additionally, adjustable current limitation is also provided.

4. Can this device be used for reversing applications?
No. The 3RW4422-1BC44 is a non-reversing soft starter. For reversing applications, add external reversing contactors to the circuit.

5. What is the power loss during operation?
The Siemens 3RW4422-1BC44 has only 8W power loss at rated current. As a result, the integrated bypass system keeps energy consumption low.

Why Choose the Siemens 3RW4422-1BC44?

This SIRIUS soft starter delivers reliable motor starting with advanced protection features. For starters, the Siemens 3RW4422-1BC44 offers two connection modes for application flexibility. Standard circuit provides 29A (15kW) for normal applications. In contrast, inside-delta circuit provides 50A (22kW) for higher power requirements. The integrated bypass contactor reduces heat and power loss to only 8W. Furthermore, comprehensive protection features include motor overload and thermistor evaluation. Adjustable current limitation lets you optimize starting performance for your specific motor. The 3RW4422-1BC44 also includes a motor brake output for additional control. External reset capability allows remote fault clearing from a control room. In addition, the compact dimensions with minimal side spacing save valuable panel space. UL/CSA ratings up to 30 hp make this soft starter suitable for North American installations.

Order the Siemens 3RW4422-1BC44 today for your motor starting needs. Specifically, this soft starter is perfect for conveyors, pumps, fans, compressors, and other industrial applications requiring controlled acceleration and deceleration.