Voltage, current, and frequency relays
Our relays are typically used for
- Monitoring fault current and leakage current in AC and DC installations
- Identification of insulation faults and current imbalance
- Detection of deviations in voltage AC/DC or current AC/DC
- Protection of equipment against excessive or insufficient frequency
- Prevention of damage to motors, transformers, and electrical components
Voltage, current, and frequency relays
Current, voltage, and frequency relays – reliable monitoring of electrical values
Effective monitoring of fault current, voltage, and power consumption is essential to ensure stable operation and protect equipment in both industrial and technical installations. Our range of current relays, voltage relays, and frequency relays gives you precise control over critical electrical parameters—in both AC and DC systems.
A current relay is typically used to monitor loads, detect leakage current, and provide early warning of insulation faults or overcurrent before they develop into a major fault. This makes the relays particularly useful in systems with sensitive components, electrical panels, or when measuring specific branches.
Here you can see a selection of our many relays for current, voltage, and frequency – contact us to learn more.
Power AC
IMAA
Advantages:
- For alternating current (AC)
- Measurement of differential current (earth fault) with manual 30 mA test function
- 12 programmable measuring ranges for overcurrent or undercurrent
- Individually adjustable switch-on and switch-off delay
- Relay function can be reversed (normal/inverse)
Voltage AC
UAWA
Mains voltage monitoring relay – UAWA
The mains voltage monitoring relay provides early warning in the event of overvoltage or undervoltage, protects equipment from damage and fire, increases personal safety, and reduces downtime and maintenance costs.
Advantages:
- Separate adjustment of upper and lower limits
- Separate DIP switch setting for upper and lower limit function
- Time delay adjustable separately
- LED indicators
Voltage AC-DC
UMCA
Multifunction voltage monitoring relay – UMCA
A multifunctional voltage monitoring relay that automates control and protection, prevents equipment damage, increases safety, and ensures operational reliability with minimal downtime.
Advantages:
- For AC and DC voltage
- Input voltage range from 50 mV to 500 V
- 11 programmable input areas
- Separately adjustable on and off delay
- Adjustable upper and lower limits and differential
Voltage AC and frequency
UFWA
Network frequency and voltage monitoring relay – UFWA
A monitoring relay that measures voltage and frequency protects equipment from supply fluctuations and contributes to high operational efficiency, increased system stability, and reduced downtime.
Advantages:
- Adjustable version with individual settings for under- and overvoltage as well as under- and overfrequency
- Function setting via DIP switch
- Ceramic resonator controlled reference
- Individually adjustable time delay – on and off
- One unit for three mains voltages