Siemens Monitoring Relay, 3 Phase, SPDT, 250V ac

RS stock no.:: 231-3103
Distrelec Article No.:: 301-24-430
Mfr. Part No.:: 5TT3423
Manufacturer:: Siemens

Siemens Monitoring Relay, 3 Phase, SPDT, 250V ac

Subtotal (1 unit)*

R 2 796,32

(exc. VAT)

R 3 215,77

(inc. VAT)

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Shipping from 30 November 2026

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Units	Per unit
1 +	R 2,796.32

*price indicative

RS stock no.:: 231-3103
Distrelec Article No.:: 301-24-430
Mfr. Part No.:: 5TT3423
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
	Product Type	Monitoring Relay
	Electrical Phase	3
	Contact Configuration	SPDT
	Switching Voltage	10V
	Terminal Type	Screw
	IP Rating	IP20
	Minimum Operating Temperature	-20°C
	Supply AC Voltage	250V ac
	Contact Current	4A
	Maximum Operating Temperature	60°C
	Length	64mm
	Series	5TT3
	Height	90mm
	Standards/Approvals	RoHS
	Width	18mm

	Select all
	Brand Siemens
	Product Type Monitoring Relay
	Electrical Phase 3
	Contact Configuration SPDT
	Switching Voltage 10V
	Terminal Type Screw
	IP Rating IP20
	Minimum Operating Temperature -20°C
	Supply AC Voltage 250V ac
	Contact Current 4A
	Maximum Operating Temperature 60°C
	Length 64mm
	Series 5TT3
	Height 90mm
	Standards/Approvals RoHS
	Width 18mm

COO (Country of Origin):: DE

Siemens 5TT3 Series Monitoring Relay, 250V ac supply voltage, 4A Operational Current - 5TT3423

This monitoring relay is a phase-sequence detector designed for AC systems, operating from a nominal 250V AC supply to supervise rotation direction and sequence. It provides a single changeover contact to signal correct phase order and is intended for panel or DIN-rail integration in industrial control environments. The device features a transparent cap for visible status indication and is rated for use within typical industrial ambient conditions.

Features and Benefits:

• 250V AC supply ensures compatibility with mains control circuits
• SPDT contact configuration delivers a single switching output
• 4A rated switching current supports moderate control loads
• 10V minimum switching voltage allows low-voltage signalling
• Operating range factor 0.8 to 1.1 accommodates voltage variations

Applications

• Suitable for detecting motor rotation direction in motor controls
• Ideal for phase-sequence verification in distribution panels
• Used with control systems requiring single-contact status signalling
• Can be used for monitoring three-phase supply sequencing

What contact layout does the device provide?

It uses one single-pole double-throw contact to change state on correct phase sequence.

What environmental temperatures can it operate within?

It operates between -20°C and 60°C ambient temperature.

How is the device connected electrically?

Terminals use cross-head screw connections accepting up to 2 x 2.5mm² rigid conductors.

What protection classification applies with connected conductors?

The unit has an IP20 rating when conductors are connected and is protection class II.