Switch position indicator and test function
STOP button
Selector switch for manual/automatic reset
Screw connection or Spring-clamp versions
Impulse voltage resistance 6 kV
Insulation voltage 690V
Surface or DIN-rail stand-alone mounts available, see 706-1699 etc

The 3RU21 thermal overload relays up to 80 A have been designed for current-sensitive protection of loads with normal starting.
These thermal overload relays for use with Sirius Size S0 & S00 Contactors

Screw terminals can only be used with screw terminal overloads and spring terminals can only be used with spring terminal overloads.

CE, UL, CSA

This overload relay is vital for motor protection in various industrial settings. It prevents motor damage by ensuring operation within specified current limits. Featuring performance and adaptability, it supports both automatic and manual reset options for diverse operational needs.

• Thermal overload protection ensures motor safety under varying loads
• Adjustable current response value from 7A to 10A increases flexibility
• High-temperature operating range of -40°C to +70°C accommodates diverse environments
• Integrated auxiliary contacts provide immediate operational status feedback
• Screw terminal connections enable secure and straightforward installation
• Compact design allows use in limited spaces without compromising quality

• Designed for industrial motor protection in automation systems
• Suitable for requiring thermal overload protection
• Compatible with 3-phase AC motors in mechanical setups
• Applicable in environments with high ambient temperatures
• Utilised in electrical cabinets needing precise motor control

The device can be reset manually or automatically based on the configuration selected.

It is specifically designed for 3-phase AC motors up to 10A.

The maximum installation altitude is 2000m above sea level.

Yes, it operates effectively within a temperature range of -40°C to +70°C.

It employs screw-type terminals for both main and auxiliary circuits.