SIEMENS Overload Relay 11-16 A, Class 10, S0, 3-Pole, 1NO+1NC, Screw Terminals, 3RU2126-4AB0

In motor control panels, the SIEMENS 3RU2126-4AB0 thermal overload relay protects three-phase motors up to 16 A. It mounts directly onto S0 contactors or stands alone with an adapter. The current setting range of 11–16 A and CLASS 10 trip curve suit standard industrial motors with normal starting conditions.

Key specifications

• Current setting range: 11–16 A
• Size: S0, suitable for contactors like 3RT202
• Trip class: CLASS 10
• 3-pole, thermal overload release
• Auxiliary contacts: 1 NO + 1 NC
• Reset: manual and automatic
• Phase failure sensitivity: yes
• Ambient temperature compensation: yes
• Rated insulation voltage: 690 V
• Rated impulse withstand voltage: 6 kV
• Connection: screw terminals
• Degree of protection: IP20 terminals, IP00 main circuit
• Operating temperature: -20 to +60 °C
• Standards: IEC 60947-4-1, IEC 60947-5-1

Why choose it

The thermal overload release reacts to phase unbalance and overloads, preventing motor damage. Manual or automatic reset adapts to the application. Direct contactor mounting saves wiring and space in motor starters.

Ideal use cases

• Motor starters with S0 contactors
• Conveyor, pump, and fan drives
• Stand-alone overload protection with adapter

Good to know

The relay requires no auxiliary supply and operates reliably across a wide temperature range. Screw terminals accept standard conductors.