Overview
The Siemens 3TF3300-0A contactor is a 3-phase IEC-compliant power contactor engineered for frequent motor starting, stopping, and reversing control in industrial automation systems. This Size 1 contactor is rated for 30A continuous duty and operates at 600V, making it suitable for controlling motors up to 15 HP at 460V or 7.5 HP at 230V. The unit features robust contact design and proven reliability for harsh industrial environments.
Key Features
- 3-phase AC power contactor for IEC and NEMA-compatible installations
- 30A rated current with 600V insulation voltage rating
- AC-3 utilization category for frequent motor starting duty
- Compact Size 1 frame for DIN rail or panel mounting
- High electrical and mechanical endurance with long contact life
- Low coil power consumption for energy-efficient operation
- Compatible with 3TX4 auxiliary contact blocks for expanded control logic
Technical Specifications
- Manufacturer: Siemens
- Part Number: 3TF3300-0A
- Contactor Size: Size 1 (Frame 1)
- Poles: 3-pole (3P)
- Rated Current: 30A AC-3 at 400/380V
- Voltage Rating: 600V (660V) insulation voltage
- Frequency: 50/60 Hz compatible
- Utilization Category: AC-3 (frequent starting duty)
- Power Output: Up to 15 HP @ 460V, 7.5 HP @ 230V
- Auxiliary Contacts: Expandable via 3TX4 blocks (up to 4 blocks)
- Mounting: DIN rail or direct panel mounting (vertical orientation)
- Standards: IEC 60947-4-1, IEC 60946, VDE 0660
- Operating Temperature: -25°C to +60°C
- Condition: Used — fully functional, tested
Typical Applications
The 3TF3300-0A is widely used for:
- Motor starter and contactor panels in industrial machinery
- Pump and compressor motor control systems
- HVAC equipment motor switching and protection
- Power distribution and load switching in control centers
- Reversing starters and soft-start system integration
- OEM automation equipment and production line control
Compatibility & Replacements
The 3TF3300-0A is part of Siemens’ SICOP 3TF power contactor family, a mature platform with global availability and field-proven reliability since the 1990s. This Size 1 contactor integrates seamlessly with Siemens overload relays (3UA series), auxiliary contact blocks (3TX4 series), and standard motor starters. For upgrades or parallel control, equivalent contactors include the SIRIUS/3RT series; however, mounting adapters may be required. Original Siemens spare parts and service support are readily available through authorized distributors worldwide.
