The Siemens 3TE74952AR0 is an industrial automatic star-delta motor starter assembly from the Siemens 3TE series, designed for efficient and safe starting of 3-phase induction motors.
It is used in motor control applications up to approximately 50 HP (37 kW), helping reduce high inrush current during motor startup by switching from star mode to delta mode automatically.
This unit is widely used in MCC panels, pump systems, compressors, conveyors, HVAC systems, and heavy industrial machinery, where smooth motor starting and protection are required.
Although it is sometimes referred to as a “power relay”, the 3TE74952AR0 is NOT a simple relay.
✔ It is a star-delta motor starter system (power control assembly)
✔ Designed for high-power motor switching, not signal-level control
• Siemens 3TE series motor starter
• Model: 3TE74952AR0
• Automatic Star-Delta starting system
• Suitable for ~50 HP (37 kW) 3-phase motors
• 415V AC industrial operation
• Reduces starting current and mechanical stress
• Built-in switching sequence (star → delta transition)
• Heavy-duty industrial design
• Screw terminal connection system
• High reliability under continuous operation
• Suitable for MCC and automation systems
• Designed for harsh industrial environments
• Long service life and low maintenance
• Compact panel mounting design
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Series | 3TE |
| Part Number | 3TE74952AR0 |
| Product Type | Star-Delta Motor Starter (Power Relay Assembly) |
| Motor Rating | ~50 HP / 37 kW |
| Voltage | 415V AC (3-phase) |
| Function | Motor starting & protection |
| Type | Automatic Star-Delta Starter |
| Application | Industrial motor control |
| Mounting Type | Panel mounting |
| Brand | Siemens |
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