The Siemens SIRIUS 3RU2 series thermal overload relay is designed for motor protection with a current setting range of 9 to 12.5 A and a trip class of 10. It is sized S0 and mounts on contactors with screw terminals for both main and auxiliary circuits. The relay features one normally closed and one normally open auxiliary contact, operates at up to 690 V AC, and supports voltages from 24 V to 400 V AC in auxiliary circuits. It is rated for an ambient temperature of -40 to +70 °C and an installation altitude up to 2,000 m. Dimensions are 85 mm height, 45 mm width, and 85 mm depth, with an IP20 protection rating on the front and terminals. The device meets IEC 60068-2-27 for shock resistance and holds ATEX certification for hazardous locations.
The thermal overload relay 3RU21261KB0 from Siemens is used for current-dependent overload protection in the main circuit. Thanks to its wide setting range of 9-12.5 A, the SIRIUS overload relay 3RU21261KB0 provides optimum protection for motors and systems up to 5.5 kW. One normally closed and one normally open contact are available as auxiliary contacts. Due to its size S0 and a convenient screw connection, the thermal overload relay 3RU21261KB0 can be perfectly integrated into the load feeder. Monitoring relays are used in all areas of electrical switchgear technology.
| Automation24, Inc. | |
|---|---|
| Product Category | Electromechanical Relays |
| Product Name | Overload relay Siemens SIRIUS 3RU21261KB0 |
| Mounting | Screw terminals |
