The multi-functional VMD421 series voltage relay is designed to monitor the frequency, undervoltage and overvoltage and the voltage between two threshold values (window discriminator function) in 3(N)AC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value required to trigger the alarm relay is stored. Due to adjustable response times, installationspecific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. The devices are supplied by the system being monitored and utilise an internal energy backup.
The multi-functional VMD421 series voltage relay is designed to monitor the frequency, undervoltage and overvoltage and the voltage between two threshold values (window discriminator function) in 3(N)AC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value required to trigger the alarm relay is stored. Due to adjustable response times, installationspecific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. The devices are supplied by the system being monitored and utilise an internal energy backup.
Type | Nominal system voltage Un* | Response value | Art. No.** |
---|---|---|---|
VMD421H-D-3 | 3(N)AC 70…500 V, 15…460 Hz | AC 70…500 V | B73010007 B93010007 |
* absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)
Type | Art. No. |
---|---|
Mounting clip for screw mounting (one piece per device) | B98060008 |
Mounting frame XM420 | B990994 |
Name | Category | Size | Language | Timestamp | D-/B-Number |
---|---|---|---|---|---|
UKCA - VMx42x | Declarations of Conformity | 156.2 KB | 2024/10/0202.10.2024 | ||
VMx42x | CE Declarations of conformity | 104.6 KB | 2024/10/0202.10.2024 | ||
VMD421H | Manuals | 1.9 MB | DE | 2021/06/2121.06.2021 | D00138 |
VMD421H | Manuals | 1.9 MB | EN | 2021/06/2121.06.2021 | D00138 |
VMD421H | Manuals | 798.3 KB | ES | 2019/05/1313.05.2019 | D00138 |
VMD421H | Datasheets | 411.0 KB | DE | 2019/05/1313.05.2019 | D00138 |
VMD421H | Datasheets | 363.3 KB | EN | 2019/05/1313.05.2019 | D00138 |
VMD421H | Datasheets | 322.0 KB | ES | 2019/05/1313.05.2019 | D00138 |
VMD421H | Datasheets | 530.7 KB | ZH | 2019/05/1313.05.2019 | D00138 |
VMD421H | Quickstarts | 892.4 KB | DE | 2024/05/2323.05.2024 | D00138 |
VMD421H | Quickstarts | 892.4 KB | EN | 2024/05/2323.05.2024 | D00138 |