DIN AC Voltage Sensor
€79.00
Available, delivery time: 1-2 weeks
Reliable Mains Voltage Monitoring in the Control Cabinet
The Didactum DIN AC Sensor reliably monitors the presence and level of AC voltage in server rooms, distribution cabinets, and other critical business areas. It detects undervoltage, overvoltage, power failures, and voltage fluctuations at an early stage and triggers an alarm if needed, helping prevent costly downtime and hardware damage.
As a compact DIN rail analog sensor, it can be easily integrated into existing control cabinet infrastructures and connected to any Didactum Monitoring System via a free analog sensor port (A1...A8).
Sensor Design at a Glance
The sensor is designed as a compact DIN rail housing and features two separate connection areas: the input terminals for the AC voltage to be monitored and the digital output to the monitoring system.
Input (screw terminals)
Two screw terminals (strip length 6–7 mm, conductor cross-section up to 2.5 mm² / 22–12 AWG) for connecting the AC line to be monitored. An internal 140 kΩ resistor is used to detect only the presence and level of the voltage — no current measurement is performed.
Output (RJ-11, 6P4C)
Digital autosense port (0–5V) for connection to a free analog sensor port (A1...A8) of the Didactum Monitoring System or a sensor expansion unit.
Housing (DIN rail, 2M)
Compact housing for mounting on a 35 mm DIN rail, optionally with 7 mm or 15 mm installation depth. Protection class IP20H / IP40H.
Installation and Commissioning
Installation is simple and flexible and can also be retrofitted into existing control cabinet infrastructures.
The sensor is mounted on a DIN rail in the control cabinet or distribution box. The AC line to be monitored is connected to the input terminals, and the RJ-11 output is connected via a sensor cable to a free analog port (A1...A8) of the Didactum Monitoring System. Thanks to plug-and-play and autosense functionality, the sensor is detected automatically and made available in the web interface for configuration.
Individual thresholds, notifications, and alarms can be defined in the web interface. Depending on the configuration, alarms can be triggered by email, SMS, SNMP trap, or by automatically switching a relay.
Important note: To ensure that a power failure is reported reliably, the monitored line must not be protected by a UPS. However, the Didactum Monitoring System itself should be connected to a UPS so that notifications can still be sent in the event of an alarm.
Measurement Range and Technical Data
The sensor measures only the presence and level of AC voltage, not the flowing current. The operating temperature range is -10 °C to +80 °C at a humidity of 5 to 95 % (non-condensing).
Typical Use Cases
The DIN AC Sensor is suitable wherever stable mains voltage is business-critical.
- Server room monitoring: Continuous monitoring of power supply for server racks, switches, and cooling systems
- Data centers: Monitoring the supply voltage of all critical systems to ensure operational reliability
- Industrial plants: Monitoring the supply voltage of machines and automation systems in production environments
- Building management systems (BMS): Integration for voltage monitoring of HVAC systems, lighting, and other electrical equipment
- Power distribution: Real-time monitoring of supply voltage directly in the distribution cabinet
- Telecommunication stations: Ensuring a constant power supply at base stations
- UPS systems: Integration to monitor input voltage and prevent failures caused by under- or overvoltage
- Critical infrastructure: Monitoring of power centers, laboratories, or medical facilities with life-sustaining power supply
Why This Sensor Is the Right Choice
Reliable monitoring
Detects undervoltage, overvoltage, and power failures in the 0–246 V AC range.
Easy DIN rail mounting
Compact DIN rail housing for flexible integration in the control cabinet.
Plug & Play
Automatic detection at the analog port, no additional software required.
Custom alerting
Notifications via email, SMS, SNMP trap, or automatic relay switching.
Long range
Up to 100 m distance from the central unit for flexible placement.
Scalable
Expandable via the Didactum sensor expansion unit for more sensors and greater distances.
Versatile use
Suitable for IT, industry, and building management alike.
Made in the EU
Developed and manufactured in the European Union.
What Is Included
Please check the delivery for completeness upon receipt and report any missing or damaged parts to your supplier immediately.
- DIN AC Sensor1 piece
More About the DIN AC Sensor
Connection & commissioning
Additional information on connecting and commissioning the DIN AC Sensor.
To the guide →Frequently Asked Questions
How is the sensor connected?
The sensor is mounted on a DIN rail. The AC line to be monitored is connected to the input terminals, and the RJ-11 output is connected via a sensor cable to a free analog port (A1...A8) of the Didactum Monitoring System and detected automatically.
Does the sensor also measure flowing current?
No. The sensor measures only the presence and level of AC voltage via an internal 140 kΩ input resistor — no current measurement is performed. For current measurement, Didactum offers separate AC and DC current transformers.
Why must the monitored line not be backed up by a UPS?
If the monitored line itself is UPS-buffered, a real mains failure would not be reliably detected by the sensor, since voltage would remain present at the measuring point. The Didactum Monitoring System itself should still be connected to a UPS so that notifications can continue to be sent in the event of an alarm.
How accurate is the sensor and what voltage range does it cover?
The sensor covers a voltage range from 0 to 246 V AC with an accuracy of ±1 %.
How far can the sensor be placed from the monitoring system?
The maximum distance to the central unit is up to 100 meters. If required, this distance can be increased further using a Didactum sensor expansion unit.
Can I use multiple DIN AC Sensors at the same time?
Yes, you can connect one additional sensor to each free analog port of your monitoring unit. If the available ports are not sufficient, the number of available analog ports can be increased further with a Didactum sensor expansion unit.
Questions about the DIN AC Sensor?
Our support team in Germany provides free advice on selection, wiring, and configuration.
Didactum DIN Sensor Alternating Current
Function
- Analog plug-and-play sensor for measuring alternating voltage
- Real-time monitoring of electrical systems and devices
- Direct connection to analog ports (A1...A8) of Didactum monitoring systems
- Ideal for use in control cabinets and rack environments
- Expandable via expansion unit
Measuring Range
- Voltage range: 0 – 246 V AC
- Accuracy: ±1 %
Connections
- Input: screw terminals (stripping length 6–7 mm, conductor cross-section up to 2.5 mm² / 22–12 AWG)
- Output: RJ-11 (6P4C), autosense port (0–5 V)
- Maximum distance: up to 100 m to the central unit
Electrical Data
- Power consumption: 60 mW
Environmental Conditions
- Operating temperature: -10 °C to +80 °C
- Humidity: 5 % to 95 % (non-condensing)
- Protection class: IP20H / IP40H
Mechanical Data
- Design: DIN rail (2M)
- Dimensions: height 90.2 mm, width 36.3 mm, depth 57.5 mm
- Mounting: DIN rail (35 mm height, 7 mm / 15 mm depth)
General
- Manufacturing: EU
- HS code: 9030 33 300
Can be used with monitoring unit:
Can be used with extension unit:
Manufacturer information:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
