Product Description
Siemens 3RU1146-4DB0 class 10 thermal overload relay for direct mounting on size S3 contactors (3RT1044, 3RT1045, and 3RT1046), is adjustable from 18A to 25A and has phase loss protection. The manual or automatic reset feature on this Sirius series relay helps handle nuisance tripping when automatic reset is enabled and prevents potential motor damage when set to manual. The 3RU1146-4DB0 overload comes with screw terminals for easy installation and can be separately mounted from the contactor with a DIN rail or base mounted bracket.
| AMP range | 18 to 25A |
| Protection | Class 10 (trips in 10 seconds or less) |
| Phase Loss Protection | Yes |
| Reset type | Manual or Automatic |
| Mounts to | 3RT1044, 3RT1045, 3RT1046 |
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The 3RU11 thermal overload relays up to 100A are designed for current-dependant protection of applications with normal start-up conditions against impermissably high rises in temperature as a result of overload or phase failure. An overload or phase failure causes the motor current to rise above the set rated motor current. Resetting takes places manually or automatically after a recovery time has elapsed. The 3RU11 thermal overload relays are electrically and mechanically optimised to the 3RT1 contactors such that, in addition to individual mounting, they can also be directly mounted onto the contactors to save space. The 3RU11 thermal overload relays are designed for the protection of three-phase and single-phase AC and DC motors. If single-Phase AC or DC loads are to be protected using the 3RU11 thermal overload relays, all three bimetal strips should be heated. The 3RU11 thermal overloads relay is available for normal start up conditions in Class 10.
