3UA50-40-0K Siemens Bimetal Thermal Overload Relay With Terminal Bracket JRS2-F418 (3UX1418)
The Siemens 3UA50 40-0K is an industrial-grade, three-pole bimetallic thermal overload relay designed to provide accurate and reliable current-dependent protection for electric motors. Operating on the proven bimetallic principle, this relay monitors current values and safely disconnects downstream machinery under prolonged overload conditions or phase failures.
Engineered with a versatile adjustable current dial scaling from 0.8 to 1.25 Amps, the 3UA50 40-0K features an integrated Trip Class 10A profile for responsive fault handling. It is built for seamless direct-mounting installation below standard Siemens World Series contactors (including 3TF30, 3TF31, 3TF40, and 3TF41 setups) or can function as a standalone component via an independent terminal adapter.
Feature | Specification |
|---|---|
Model | 3UA50 40-0K (3UA5040-0K) |
Brand | Siemens |
Relay Technology Type | Thermal Bimetallic (Current Dependent) |
Number of Poles | 3-Pole (3-Phase Protection) |
Current Adjustment Range | 0.8 Amps to 1.25 Amps |
Tripping Curve Class | Class 10A (Standard Inverse-Time Delay) |
Integrated Auxiliary Contacts | 1 NO + 1 NC (Normally Open + Normally Closed) |
Rated Insulation Voltage ($U_i$) | 690V AC |
Rated Operational Voltage ($U_e$) | Up to 600V AC |
Reset Mode Configurations | Manual Reset / Automatic Reset (Selector Switch) |
Phase Failure Protection | Yes (Built-in Phase Drop Compensation) |
Contactor Compatibility | Fits 3TF30, 3TF31, 3TF40, 3TF41, 3TB40, 3TB41 |
Terminal Mounting Styles | Direct Plug-In / Standalone (with 3UX adapter) |
Ssaoco Dammam
- Started from: Jul 10, 2025
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