3RU1146-4FB0 - Siemens Thermal Overload Relay 28-40A Class 10 Size S3 Screw Terminal Motor Protection

3RU1146-4FB0

3RU1146-4FB0 is a Siemens thermal overload relay designed for motor protection with an adjustable current range of 28 to 40 amps and Class 10 trip rating.

This overload relay features a Size S3 frame and is intended for contactor mounting with screw terminals for both main and auxiliary circuits. It provides phase loss sensitivity and manual-automatic reset functionality. The relay supports a rated insulation voltage of 1000 V and a surge voltage resistance of 8 kV. It includes one normally closed and one normally open auxiliary contact, with short-circuit protection requiring specific fuse links. The device is rotatable +/-135° on a vertical mounting surface and has an IP20 front protection class.

• Adjustable current range: 28 to 40 A
• Trip class: 10
• Size: S3
• Number of poles: 3
• Main circuit connection: Screw terminal
• Auxiliary circuit connection: Screw terminal
• Rated insulation voltage: 1000 V
• Surge voltage resistance: 8 kV
• Auxiliary contacts: 1 NC, 1 NO
• Mounting: Contactor mounting, rotatable +/-135°
• Short-circuit protection: Requires gG fuse links (80 A or 160 A depending on coordination)
• Protection class: IP20 (front)

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Specifications

• Part Number: 3RU1146-4FB0
• Manufacturer : Siemens
• Brand : Siemens
• Category : Motor Control
• Item Subcategory : Overload Relay
• Family : Sirius
• Type : 3RU11
• Relay Style : Thermal
• Amperage Maximum : 40
• Amperage Minimum : 28

Product Data

• UPC : 754554412559
• GTIN : 00754554412559
• Weight : 10