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Siemens 3RU21364FB0 overload relay, 28-40A, trip class 10, 3-pole, S2 frame, auto manual reset

SIEMENS

SIEMENS 3RU21364FB0 Overload Relay 28-40A Trip Class 10 3-Pole S2 Auto Manual Reset

SKU CH-8Q1A-RJFE9

Protects 3RT203 contactors with 28 to 40 A trip class 10 three-pole S2 auto manual reset

  • Trip Class 10 protects motors from sustained overloads
  • Current range 28 to 40 A matches load requirements
  • Three-pole design covers all phases in one unit
  • S2 frame fits 3RT203 contactor series directly
  • Auto and manual reset options give flexible recovery

Compatible Overload Protection

The SIEMENS 3RU21364FB0 overload relay provides motor protection for currents between 28 and 40 amperes. It is designed for use with 3RT203 series contactors in three-phase applications. The unit suits industrial control panels requiring Trip Class 10 response.

Panel Integration Requirements

This relay mounts directly to compatible 3RT203 contactors, eliminating separate DIN-rail mounting hardware. The three-pole configuration matches standard three-phase motor wiring. Frame size S2 determines the physical envelope inside the enclosure.

Dual Reset Flexibility

The relay offers both automatic and manual reset modes selectable on the device. Automatic reset restarts the motor once the overload condition clears without operator intervention. Manual reset requires a deliberate press, preventing unintended restarts after a trip event.

Highlights

  • Trip Class 10 protects motors from sustained overloads
  • Current range 28 to 40 A matches load requirements
  • Three-pole design covers all phases in one unit
  • S2 frame fits 3RT203 contactor series directly
  • Auto and manual reset options give flexible recovery

Specifications

BrandSIEMENS

Questions about this item

At what sustained current will the 28-40 A trip class 10 relay begin to open?

The relay is calibrated to trip on sustained currents above the 40 A upper setting while operating in trip class 10.

How much heat does the 3RU21364FB0 generate when carrying 40 A continuously?

Power dissipation at full-load current is a standard characteristic of the S2 frame overload relay design.

Which contactor series must already be mounted for this S2 frame overload to fit directly?

The overload relay is built for direct mounting on Siemens 3RT203 series contactors.

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