Siemens, SIRIUS 3RU2 Thermal Overload Relay 1 NO/1 NC, 4.5A, 6.3 A F.L.C, 6.3A Contact Rating, 4 kW 3P

RS stock no.:: 706-1636
Distrelec Article No.:: 304-23-390
Mfr. Part No.:: 3RU2126-1GB0
Manufacturer:: Siemens

Siemens, SIRIUS 3RU2 Thermal Overload Relay 1 NO/1 NC, 4.5A, 6.3 A F.L.C, 6.3A Contact Rating, 4 kW 3P

Subtotal (1 unit)*

R 1 121,56

(exc. VAT)

R 1 289,79

(inc. VAT)

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Shipping from 18 September 2026

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Units	Per unit
1 +	R 1,121.56

*price indicative

RS stock no.:: 706-1636
Distrelec Article No.:: 304-23-390
Mfr. Part No.:: 3RU2126-1GB0
Manufacturer:: Siemens

Specification

Technical data sheets

Legislation and Compliance

Product Details

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	Siemens
	FLC Motor Rating	4.5, 6.3A
	Product Type	Thermal Overload Relay
	Relay Contact Current	6.3A
	Mount Type	Direct
	Series	SIRIUS 3RU2
	Power Rating	4kW
	Pole and Throw Configuration	3P
	Terminal Type	Screw
	Normal State Configuration	1 NO/1 NC
	Reset Method	Automatic & Manual
	IP Rating	IP65, IP55
	Width	45mm
	Adjustable Current Range	4.5 → 6.3 A
	Number of Auxiliary Contacts	2
	Minimum Operating Temperature	-40°C
	Maximum Operating Temperature	70°C
	Contact Voltage	690V ac
	Length	87mm
	Depth	73mm
	Standards/Approvals	IEC, CCC, CE, REACH, WEEE (2012/19/EU), EAC, UL, UKCA, RoHS

	Select all
	Brand Siemens
	FLC Motor Rating 4.5, 6.3A
	Product Type Thermal Overload Relay
	Relay Contact Current 6.3A
	Mount Type Direct
	Series SIRIUS 3RU2
	Power Rating 4kW
	Pole and Throw Configuration 3P
	Terminal Type Screw
	Normal State Configuration 1 NO/1 NC
	Reset Method Automatic & Manual
	IP Rating IP65, IP55
	Width 45mm
	Adjustable Current Range 4.5 → 6.3 A
	Number of Auxiliary Contacts 2
	Minimum Operating Temperature -40°C
	Maximum Operating Temperature 70°C
	Contact Voltage 690V ac
	Length 87mm
	Depth 73mm
	Standards/Approvals IEC, CCC, CE, REACH, WEEE (2012/19/EU), EAC, UL, UKCA, RoHS

COO (Country of Origin):: DE

Siemens 3RU Series Overload Relay, 6.3 A Contact Current Rating, 4kW Power Rating - 3RU2126-1GB0

This overload relay is specifically designed for motor protection, ensuring safe operation of electrical equipment. It is vital in safeguarding motors against overload conditions, thereby extending the machinery’s lifespan. The robust features and innovative design make this relay an essential component in industrial automation and electrical applications.

Features & Benefits

• Thermal overload protection for currents between 4.5A and 6.3A

• Offers integrated automatic and manual reset options for enhanced usability

• Configured for 3P installations, providing versatility

• Functional in a temperature range of -40°C to +70°C

• Features screw-type terminals for secure connections

• Supports operational voltage ratings up to 690V AC

Applications

• Utilised for motor protection in various industrial settings

• Suitable for integration into electrical control circuits

• Effective for protecting pumps, conveyors, and compressors

• Commonly employed in automation systems requiring overload trip functions

What is the operating temperature range for optimal performance?

The product operates effectively within -40°C to +70°C.

How is the overload protection reset?

It features both automatic and manual reset methods.

Can it be installed in any orientation?

Yes, the relay allows for installation in any mounting position.

What types of motors can it protect?

It is suitable for standard three-phase AC motors.

What current ratings does it support?

The overload relay supports current ratings between 4.5A and 6.3A.