3RU2136-4BB0

The 3RU2136-4BB0 belongs to the SIRIUS 3RU2 thermal overload relay S2 size series, with a current setting range of 14...20A. It adopts a direct contactor mounting method and has 1 NO + 1 NC auxiliary contacts. It is the model with the lowest current adjustable range in this series.

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Siemens SIRIUS 3RU2136-4BB0 Thermal Overload Relay 14-20A Product Image

Product Positioning

The 3RU2136-4BB0 is a Siemens SIRIUS 3RU2 series S2 size thermal overload relay with a current adjustment range of 14...20A. It can be directly mounted on a 3RT20 series contactor and is used for overload and phase loss protection of small three-phase motors.

Core Product Advantages and Features

Adjustable current 14...20A

Suitable for three-phase motors with a full-load current between 14 and 20 amps, it is one of the models with the lowest current range in the S2 size series.

Contactor direct mounting design

It can be directly snapped onto the 3RT20 series S2 contactor, eliminating the need for additional wiring and saving installation space.

Class 10 Escape Feature

Compliant with IEC Class 10 overload trip curves, balancing startup and protection requirements.

1NO+1NC auxiliary contact

Provides a trip signal feedback contact, which can be linked to the control circuit to display the status.

project	Specification
Series Specifications	SIRIUS 3RU2 Second Generation Thermal Overload Relay
Applicable size	S2 (compatible with 3RT20 series contactors)
Break away from level	Class 10
Auxiliary contact	1NO+1NC
Rated operating voltage	690V AC
Protection level	IP20
Operating temperature	-40...+70°C
Current adjustment range	14...20 A
Installation method	Contactor mounting

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