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Siemens SIRIUS 3RU21264CB0 Thermal Overload Relay, 1NC-1NO Contact

Selected 3RU21261JB0Siemens SIRIUS 3RU21261KB0 Thermal Overload Relay, 1NC-1NO Contact
3RU21261JB0Siemens SIRIUS 3RU21261KB0 Thermal Overload Relay, 1NC-1NO Contact

Documents

Short Description

The 3RU21 thermal overload relays up to 40 A have been designed for inverse time delayed protection of loads with normal starting against excessive temperature rises due to overload or phase failure. An overload or phase failure results in an increase of the motor current beyond the set rated motor current. Via heating elements, this current rise heats up the bimetal strips inside the device which then bend and as a result trigger the auxiliary contacts by means of a tripping mechanism. The auxiliary contacts then switch off the load by means of a contactor. The break time depends on the ratio between the tripping current and current setting Ie and is stored in the form of a long term stable tripping characteristic. The "tripped" status is signaled by means of a switch position indicator. Resetting takes place either manually or automatically after a recovery time has elapsed.

Features

  • Overload and phase failure protection
  • Manual and automatic reset
  • Switch position indicators
  • TEST function
  • STOP button
  • Size S0
  • Class 10
  • Optimized to the 3RT contactors such that in addition to individual mounting they can mounted directly mounted onto the contactors to save space
  • -50 to 80 deg C environmental condition
  • B600/R300 contact

Specification

Frequency Rating
50/60 Hz
Mounting Type
Contactor
Number Of Poles
3
Minimum Order Qty
1
Order Interval
1
Video
https://www.youtube.com/watch?v=n2AKmVUVH7Y
Contact Form
1NC-1NO
Dimensions
85 mm H x 45 mm W x 85 mm D
Enclosure Type
IP20
Temperature Rating
-20 to 70 deg C
Terminal Type
Threaded
Application
For protection of three phase and single phase AC and DC motors
Standard & Approvals
CCC Certified, CE Certified, CSA Certified, EAC Approved, UL Listed
Contact Rating
22 A at 690 VAC
Catalog ID
SIE3RU21264CB0
EANUCC13
4011209780958

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