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Siemens 3RU21364GB0 overload relay, three-pole S2 frame, grey plastic housing

SIEMENS

SIEMENS 3RU21364GB0 Overload Relay 36-45A Trip Class 10 3 Pole S2 Frame Auto Manual Reset for 3RT203

SKU CH-17NH-HRFR5

Protects 3RT203 contactors with a 36-45A range, trip class 10, three poles, S2 frame and auto or manual reset

  • Protects motors from 36 to 45 A overloads
  • Trip Class 10 gives fast thermal response
  • Three-pole design matches three-phase circuits
  • S2 frame fits 3RT203 contactor series
  • Auto and manual reset options simplify recovery

Overload Relay 36-45A Trip Class 10

The SIEMENS 3RU21364GB0 is a three-pole overload relay designed for motor protection in industrial control panels. It operates with a current setting range of 36 to 45 amperes and conforms to trip class 10. The S2 frame unit provides both automatic and manual reset options for flexible recovery after a trip event. It is built for use with the 3RT203 contactor series.

Suited For 3RT203 Contactor Panels

This relay suits panel builders wiring 3RT203 contactors who need adjustable overload protection in the 36 to 45A window. It fits applications requiring trip class 10 response and the choice of auto or manual reset. Installers working with different contactor series, other current ranges or a fixed reset method should look at alternative devices that match those specifications.

Auto Manual Reset Flexibility

The dual reset function changes how maintenance teams handle overload events. Automatic reset allows the circuit to re-energise once the relay cools, reducing downtime on unattended equipment. Manual reset requires a deliberate operator action, adding a safety checkpoint before restart. No additional accessories or software are bundled with the relay itself.

Highlights

  • Protects motors from 36 to 45 A overloads
  • Trip Class 10 gives fast thermal response
  • Three-pole design matches three-phase circuits
  • S2 frame fits 3RT203 contactor series
  • Auto and manual reset options simplify recovery

Specifications

BrandSIEMENS

Questions about this item

Which contactor series must I already have for the 3RU21364GB0 to mount and operate correctly?

The overload relay is designed for use with the 3RT203 contactor series; it will not fit other series without an adapter.

If I keep an older 3RT203 contactor, will the 36-45 A trip range and class 10 characteristic still protect it properly?

Yes, the 36 to 45 A current range and trip class 10 match the protection requirements of the 3RT203 contactor when applied within its rated load.

How can I verify the relay is functioning after installation?

Apply a test current within the 36 to 45 A range; the unit should trip within the class 10 time curve and then allow either automatic or manual reset.

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