Siemens 3RU21364RB0 Thermal Overload Relay S2 Class 10

Product Description

The SIEMENS 3RU21364RB0 is a thermal overload relay rated for Size S2 motor starters with Class 10 trip characteristics. Thermal overload relays protect three-phase motors from sustained overcurrent conditions that cause overheating and winding damage. This relay monitors motor current and trips the contactor circuit when current exceeds the set threshold for a sustained period. Class 10 tripping is standard for most general-purpose motor applications. Licensed electricians and industrial maintenance technicians install and configure this device as part of a motor starter assembly in commercial and industrial control panels.

The 3RU21364RB0 is suited for use in motor starter combinations where a Size S2 contactor is already installed or being assembled. It is appropriate for three-phase motor protection in HVAC equipment, pump systems, conveyor drives, and other industrial motor loads. Class 10 trip class covers the majority of standard induction motor applications where moderate starting currents are expected.

Key Features

• Class 10 trip characteristic for standard induction motor protection
• Size S2 frame matches directly to compatible Size S2 contactors
• Thermal bimetal overload detection without external power supply required
• Manual or automatic reset functionality typical of this relay family
• Compact design integrates directly onto matching contactor frames

Compatibility

Designed as an OEM-style overload relay for use with Size S2 motor starter contactors in three-phase motor protection applications.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NFPA 70 (NEC) and applicable local codes. De-energize and lock out the panel before installing or adjusting the overload relay. Set the current adjustment dial to match the full-load amperage of the motor being protected before energizing the circuit. Do not bypass or jumper the overload contacts during testing.

Technical Specifications

• Frame Size: S2
• Trip Class: Class 10
• Weight: 0.705 pounds
• UPC: 88762191980

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RU21364RB0