Omron H3RN Series Timer Relay, 2-Contact, 12 V dc 12 V ac, 0.1 min to 10 h, Multifunction-Function, DPST Switch

RS Stock No.:: 236-1256
Mfr. Part No.:: H3RN-21 12VDC
Brand:: Omron

Omron H3RN Series Timer Relay, 2-Contact, 12 V dc 12 V ac, 0.1 min to 10 h, Multifunction-Function, DPST Switch

Bulk discount available

Subtotal (1 unit)*

£56.21

(exc. VAT)

£67.45

(inc. VAT)

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Temporarily out of stock

3 unit(s) shipping from 06 May 2026

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Units	Per unit
1 - 4	£56.21
5 - 9	£53.97
10 +	£52.26

*price indicative

RS Stock No.:: 236-1256
Mfr. Part No.:: H3RN-21 12VDC
Brand:: Omron

Specifications

Technical Reference

Legislation and Compliance

Product Details

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	Omron
	Product Type	Timer Relay
	Time Range	0.1 min to 10 h
	Number of Contacts	2
	Number of Timer Functions	Multifunction
	Contact Configuration	DPST
	IP Rating	IP40
	Supply DC Voltage	12 V dc
	Contact Current	3A
	Minimum Operating Temperature	-10°C
	Supply AC Voltage	12 V ac
	Maximum Operating Temperature	55°C
	Terminal Type	Socket
	Length	31.2mm
	Width	12.8 mm
	Height	53.4mm
	Standards/Approvals	UR, CSA, EN
	Series	H3RN

	Select all
	Brand Omron
	Product Type Timer Relay
	Time Range 0.1 min to 10 h
	Number of Contacts 2
	Number of Timer Functions Multifunction
	Contact Configuration DPST
	IP Rating IP40
	Supply DC Voltage 12 V dc
	Contact Current 3A
	Minimum Operating Temperature -10°C
	Supply AC Voltage 12 V ac
	Maximum Operating Temperature 55°C
	Terminal Type Socket
	Length 31.2mm
	Width 12.8 mm
	Height 53.4mm
	Standards/Approvals UR, CSA, EN
	Series H3RN

RoHS Status: Exempt

Omron H3RN Series Timer Relay, 12V DC Supply Voltage, 2 Contacts - H3RN-21 DC12

This timer relay is a compact and versatile component ideal for automation applications. With a supply voltage of 12V DC, it features a selectable operating mode including ON delay and interval timing options. The device’s dimensions include a width of 12.8mm, depth of 53.4mm, and length of 31.2mm, making it suitable for various control setups.

Features & Benefits

• Multi-function capabilities enable flexibility in timing operations

• Compact design fits into tight spaces for convenient installation

• Supports a maximum current of 3A for reliable performance

• Offers set time range from 0.1 minutes to 10 hours

• Plug-in terminal design simplifies wiring and maintenance

Applications

• Designed for use with automation systems in industrial environments

• Ideal for control circuits requiring time delays or sequences

• Utilised in temperature control for stable operations

• Suitable for lighting control where time-sensitive tasks are essential

How does the selectable operating mode enhance functionality in various applications?

The selectable operating mode allows adjustment between flicker ON/OFF and interval timing, providing adaptability to specific operational needs.

What are the implications of the maximum current rating on system designs?

The maximum current rating of 3A ensures compatibility with a range of devices while maintaining system integrity and preventing overload.

How does the compact size contribute to its usability in confined spaces?

The compact design allows for easy integration into existing systems, particularly where space is limited, thereby facilitating straightforward installation and maintenance.

Approvals

UL recognised component, CSA certified

Standards

EN61812-1