Siemens Auxiliary Contact, 1 Contact, 1 NO, 3RH1, Snap-On, 10 A, 690V, 3RH1921-2CA10

RS Stock No.:: 392-8951
Mfr. Part No.:: 3RH1921-2CA10
Brand:: Siemens

Siemens Auxiliary Contact, 1 Contact, 1 NO, 3RH1, Snap-On, 10 A, 690V, 3RH1921-2CA10

Subtotal (1 unit)*

$24.48

(exc. GST)

$26.93

(inc. GST)

FREE delivery for orders over $80.00 ex GST

In Stock

Plus 1 unit(s) shipping from 09 November 2026
Plus 50 unit(s) shipping from 09 November 2026

Need more? Click ‘Check delivery dates’ to find extra stock and lead times.

Units	Per unit
1 +	$24.48

*price indicative

RS Stock No.:: 392-8951
Mfr. Part No.:: 3RH1921-2CA10
Brand:: Siemens

Specifications

Technical data sheets

Legislation and Compliance

Product Details

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	Siemens
	Number of Contacts	1
	Product Type	Auxiliary Contact
	Normal State Configuration	1 NO
	Series	3RH1
	Mount Type	Snap-On
	Contact Current	10A
	Terminal Type	Cage Clamp
	Pole and Throw Configuration	1P
	Contact Voltage	690V
	Mounting Location	Front
	Rated Insulation Voltage Ui	690V
	Operational Current Ie	10A
	Mechanical Durability	10Mcycles
	Minimum Operating Temperature	-25°C
	Maximum Operating Temperature	60°C
	Standards/Approvals	IEC 60947-5-1, IEC 60947-4-1

	Select all
	Brand Siemens
	Number of Contacts 1
	Product Type Auxiliary Contact
	Normal State Configuration 1 NO
	Series 3RH1
	Mount Type Snap-On
	Contact Current 10A
	Terminal Type Cage Clamp
	Pole and Throw Configuration 1P
	Contact Voltage 690V
	Mounting Location Front
	Rated Insulation Voltage Ui 690V
	Operational Current Ie 10A
	Mechanical Durability 10Mcycles
	Minimum Operating Temperature -25°C
	Maximum Operating Temperature 60°C
	Standards/Approvals IEC 60947-5-1, IEC 60947-4-1

COO (Country of Origin):: CZ

Siemens 3RH1 Series Auxiliary Contact, 1P Pole Configuration, 1NO Normal State Configuration - 3RH1921-2CA10

This auxiliary contact is a front-mounted Snap-on switch designed for use with compatible contactors. It interfaces with 3RT1 contactors to provide an additional instantaneous normally open contact for signalling or control circuits. The unit operates across a wide ambient range and meets relevant IEC standards for control and power contact devices.

Features and Benefits:

• 690V Rated insulation voltage provides high-voltage compatibility
• 10A Contact current supports common control-circuit loads
• Mechanical durability 10M cycles ensures extended service life
• Spring-type terminals allow secure, vibration-resistant connection
• IP20 Front protection permits safe operator access in enclosures

Applications

• Suitable for use with 3RT10 contactors
• Ideal for front-panel status signalling in control cabinets
• Used with 3RT145 contactors for auxiliary switching tasks
• Can be used for interlock feedback to motor starters

What Terminal connection method does it use?

It uses spring-loaded terminals that accept solid or stranded conductors 0.5 to 2.5 mm².

What short-circuit protection is recommended for the auxiliary circuit?

A 10A characteristic miniature circuit-breaker or a 10A gG fuse at 500V, 1kA is specified.

What operational current can it handle at AC-15, 230V?

It can carry up to 6A under AC-15 utilisation at 230V.

How does it perform at low temperatures during operation?

It is rated for continuous operation down to -25°C.

Which standards govern its mirror-contact and safety functions?

It complies with IEC 60947-4-1 for mirror-contact use and IEC 60947-5-1 for control-device requirements.