Siemens 3RU2116-4AB0 Thermal Overload Relay, 1.1-1.6 A, Class 10, S00, Screw Terminals, 1NO+1NC

Electric motors often face the risk of overheating due to overloads, phase failure, or stalled rotors. The Siemens 3RU2116-4AB0 thermal overload relay provides dependable protection for three-phase motors up to 1.6 A, ensuring long service life and reduced downtime. This compact S00-size relay mounts directly onto Siemens contactors, creating a space-saving motor starter solution.

Who is it for

This relay is ideal for panel builders, maintenance engineers, and OEMs who need reliable motor protection in industrial control systems, conveyor drives, pumps, and fans. It suits applications where motors operate within the 1.1–1.6 A range and require class 10 tripping characteristics.

Main features

• Adjustable current setting from 1.1 A to 1.6 A for precise overload protection.
• Class 10 tripping curve offers fast response to overloads while allowing normal motor starting.
• Direct mounting onto S00 contactors saves wiring and panel space.
• Screw terminals for both main and auxiliary circuits ensure secure, vibration-resistant connections.
• 1 NO + 1 NC auxiliary contacts for status signaling and control interlocking.
• Manual/automatic reset selectable to match application requirements.
• Phase failure sensitivity protects against single-phasing conditions.
• IP20 terminal protection for safe operation in enclosed panels.

Specifications

• Current setting range: 1.1–1.6 A
• Tripping class: Class 10
• Size: S00
• Mounting: Direct contactor mounting
• Number of poles: 3
• Main circuit connection: Screw terminals
• Auxiliary circuit connection: Screw terminals
• Auxiliary contacts: 1 NO + 1 NC
• Rated operational voltage (Ue): 690 V AC
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Ambient operating temperature: -20 to +60 °C
• Overload release type: Thermal
• Reset function: Manual/automatic selectable
• Protection class: IP20 (terminals)
• Standard: IEC 60947-4-1

Tips

Set the current adjustment dial to the motor's full load current for optimal protection. For automatic restart after a trip, select automatic reset; for manual intervention, choose manual reset. Always install the relay in a suitable enclosure to maintain IP20 protection and prevent accidental contact with live terminals.