Siemens Power Contactor 3RT2337-1AP00

Main Product Series – Function & Application Comparison

Typical Applications & Industries:
✓ Motor switching and control ✓ Pump and compressor control
✓ Conveyor systems and material handling ✓ Industrial automation panels
✓ Heating and power distribution (AC-1) ✓ Heavy industrial and high-power applications

Detailed Description – Siemens SIRIUS 3RT Power Contactor Portfolio

1. Series Overview – The Complete Motor Switching Solution

The Siemens SIRIUS 3RT series is a comprehensive range of power contactors designed for switching motors and other loads in industrial applications. They are part of the SIRIUS modular system, offering coordinated products for load feeders and control circuits. The 3RT portfolio spans from compact S00 size contactors for small motors up to large S12 contactors rated for 2,650A.

Key Family Features:

• ✓ Wide power coverage – From 3 kW up to 250 kW (AC-3) and 2,650A (AC-1)

• ✓ Flexible connection options – Screw terminals or spring-loaded terminals for maintenance-free, vibration-proof connection

• ✓ Integrated auxiliary contacts – 1 NO + 1 NC as standard on S0 and above

• ✓ Worldwide approvals – IEC, UL/CSA, CCC, CE certified

• ✓ Climate-resistant design – Suitable for global use

• ✓ IE3/IE4 ready – Optimised for modern high-efficiency motors

• ✓ Modular system – Seamless integration with 3RU2/3RB3 overload relays, 3RA2 load feeders, and 3RR2 monitoring relays

2. 3RT2 Series – The Proven Workhorse

The 3RT2 series forms the core of the SIRIUS contactor portfolio, available in sizes S00 to S3. These contactors replace the well-proven 3RT1 series and offer:

Key Specifications:

Connection Types:

• Screw terminals – Standard for all sizes

• Spring-loaded terminals – Available for S00 and S0 (main and auxiliary circuits) 

Technical Features:

• Operating temperature: -25°C to +60°C 

• IP20 protection class (front) 

• Mechanical endurance: up to 30 million operating cycles 

• Surge suppressors (varistors, RC elements, diode assemblies) available as accessories

3. 3RT7 Series – Modern, Compact, Reliable

Introduced in 2021, the SIRIUS 3RT7 series is the newest addition to the portfolio, offering a modern, compact solution for motor control applications.

Key Features:

• ✓ Modern design – Compact dimensions for efficient panel assembly

• ✓ Simplified wiring – Strip-length indicators reduce installation time

• ✓ Wide operating ranges – Stable performance across varying temperature and voltage conditions

• ✓ Modular integration – Seamless connection with 3RU7 thermal overload relays (0.11–100A) and 3RH7 intermediate relays

• ✓ Expandable contacts – Flexible system configuration 

Applications: Modern control panels, OEM equipment, flexible motor control solutions.

4. 3RT10 Series – High-Power Contactors (S6 to S12)

For high-power applications up to 250 kW (AC-3), the 3RT10 series provides robust switching solutions with advanced operating mechanism options.

Key Specifications:

• ✓ Sizes: S6 to S12

• ✓ AC-1 current: Up to 2,650A

• ✓ AC-3 power: Up to 250 kW at 400V

• ✓ Operating mechanisms:

  • 3RT10…A – Standard AC/DC operation, reduced power consumption

  • 3RT10…N – Solid-state, direct control or PLC input (24V DC)

  • 3RT10…P – Solid-state, PLC input with remaining lifetime indicator (RLT)

  • 3RT10…S – Solid-state, fail-safe PLC input for simplified safety applications 

Connection:

• Busbar connections with screw terminals for auxiliary and control circuits

• Box terminals available as accessories 

Applications: Heavy industry, high-power motor control, demanding switching environments, safety-critical applications (with -S variants).

5. 3RT.4 Series – AC-1 Special Applications

The SIRIUS 3RT.4 contactors are specialised for switching low or non-inductive loads (AC-1), offering 3-pole configurations up to 2,650A.

Key Features:

• ✓ Designed for resistive loads and power distribution

• ✓ High current ratings up to 2,650A

• ✓ 3-pole configuration

• ✓ Suitable for heating loads and low-inductive applications

Applications: Power distribution, heating control, resistive load switching, power factor correction capacitors.

Key Technology Features Across 3RT Portfolio

Selection Guide – Understanding the Naming Convention (Siemens 3RT Series)

Part Number Format: 3RT2 □ □ □ - □ □ □ □ - □ □ □ □ 

Example: 3RT2025-1BB40 

Model Decoder Examples: