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SIEMENS 3RU21 THERMAL OVERLOAD RELAYS SIZE S0
Siemens 3RU21. SIZE S0.
Thermal Overload Relays for mounting onto a connector with screw-type terminal connection.(image illustrative only, device may differ from image)
Siemens thermal overload relays are designed to disconnect an appliance(e.g. motors & generators) from its power supply where otherwise damage would occur due to impermissible load conditions.
The 3RU21 thermal overload relays are suitable for customers from all industries who want to guarantee optimum inverse-time delayed protection of their electrical loads (e.g. motors) under normal starting conditions (CLASS 10).
The 3RU21 thermal overload relays have been 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 by the 3RU21 thermal overload relays, all three bimetal strips must be heated. For this purpose, all main current paths of the relay must be connected in series.