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5TT3405
Siemens 5TT3405 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
Siemens 5TT3405 is a compact N-type voltage relay for monitoring three-phase AC systems at 230/400 V. Designed to detect undervoltage across all three phases and identify phase asymmetry, it helps maintain dependable control in applications where stable voltage conditions are essential. The unit operates on AC voltage, includes two changeover auxiliary contacts, and uses screw-type terminals for secure electrical connection. With a narrow 36 mm width and overall dimensions of 90 x 36 x 64 mm, the 5TT3405 is well suited to control panels and distribution assemblies where reliable voltage supervision and efficient use of space are important.
| Specification | Description |
|---|---|
| Part number | 5TT3405 |
| Manufacturer | Siemens |
| Product type | Voltage relay |
| Relay type | N-type voltage monitoring relay |
| Monitored voltage | AC 230/400 V |
| Monitoring function | Detects undervoltage across 3 phases |
| Overvoltage monitoring | Not provided for 3-phase, 1-phase, or DC applications |
| Voltage window monitoring | Not provided for 3-phase, 1-phase, or DC applications |
| Asymmetry setting | 0.85 / 0.95 asymmetry monitoring |
| Contact configuration | 2 changeover contacts |
| Auxiliary NO contacts | 0 |
| Auxiliary NC contacts | 0 |
| Electrical connection | Screw-type terminals |
| Operating voltage | AC 230 V at 50/60 Hz |
| Undervoltage threshold | 195.5 V |
| Maximum measurable AC voltage | 253 V |
| Width | 36 mm |
| Height | 90 mm |
| Depth | 64 mm |
| Typical application | Designed for monitoring 3-phase AC voltage conditions in control and distribution systems |
What does this voltage relay do?
This device is designed to monitor AC voltage conditions in a three-phase system. It is intended for undervoltage recognition across 3 phases and can switch its outputs when the monitored condition changes.
Is this unit intended for single-phase or three-phase monitoring?
It is intended for three-phase undervoltage monitoring. The Siemens 5TT3405 datasheet indicates undervoltage recognition for 3 phases, while single-phase undervoltage and overvoltage functions are not listed for this model.
Does it monitor overvoltage as well as undervoltage?
No. The published product data identifies this relay for undervoltage recognition of 3 phases, but not for overvoltage recognition.
What supply voltage does the relay use?
The control supply voltage is 230 V AC at both 50 Hz and 60 Hz.
What monitored voltage is this relay suited for?
This model is described as an AC 230/400 V voltage relay. It is intended for AC voltage monitoring rather than DC applications.
How many output contacts are included?
The relay has 2 change-over contacts. The datasheet does not list separate NO or NC auxiliary contacts, only the two change-over outputs.
What type of terminal connection does it use?
It uses screw-type terminals, which can be useful where a traditional wired connection method is preferred in the panel.
Can this relay be used for DC voltage monitoring?
No. This unit is specified for AC monitoring and the datasheet does not list DC undervoltage, DC overvoltage, or DC voltage window monitoring functions.
Does this model provide voltage window monitoring?
No. The published technical data does not show voltage window recognition for DC, 1-phase AC, or 3-phase AC on this model.
What are the physical dimensions of the unit?
The listed dimensions are 36 mm width, 90 mm height, and 64 mm depth.
Is the switching threshold adjustable?
The available product data shows a value of 195.5 V for the voltage range entry, without indicating a wider adjustable span. For website purposes, it is best described as having a defined operating value rather than a broad user-adjustable range.
What does the asymmetry value refer to?
The product title includes an asymmetry figure of 0.85/0.95, which indicates this relay is intended for monitoring phase condition imbalance in addition to undervoltage behavior. If this parameter is especially important for the application, it should be matched carefully against the equipment requirement.
- Monitoring three-phase AC supplies for undervoltage conditions in industrial control panels
- Detecting phase asymmetry on 230/400 V networks to help maintain stable power conditions
- Switching alarm, indication, or interlock circuits through its two changeover contacts when supply faults are detected
- Supervising incoming power to motors, drives, and rotating equipment before normal operation is allowed
- Adding voltage monitoring to building services panels, plant utilities, and general distribution assemblies
- Supporting automatic shutdown or changeover logic when a three-phase supply falls below the required level
- Providing power quality supervision for machinery that depends on balanced three-phase mains
- Integrating into OEM equipment and retrofit projects where reliable three-phase undervoltage monitoring is required
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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Customer reviews
steve
Daniel
Excellent customer service...
Alex Bailey is my main point of contact at EU Automation...he is extremely friendly, has exceptional customer service skills and always offers great pricing & lead times.
2 months ago
Jerry Schrink
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Tom Higgins provided great prompt service. I contacted Tom by phone and within 10 minutes there was a quote in my in box. WOW Thank you Tom and Thank you EU Automation!
2 months ago
Paulo Pereira
Excellent service and communication…
Excellent service and communication from Alex Bailey. He truly goes above and beyond to ensure his clients are 100% satisfied. The entire process was seamless, and his attention to detail made a huge difference. Highly recommended for anyone looking for amazing service!
2 months ago
Gary
Tom Higgins did a great job at getting…
Tom Higgins did a great job at getting us the part we needed. He saw a concern with the part a verified before shipping.
3 months ago
Lessle Smith
Thomas Higgins has gone above and…
Thomas Higgins has gone above and beyond to make things happen for my facility. His customer service and knowledge were an asset in helping me with my order and the logistics challenges!
4 months ago
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