Voltage Monitoring Relays and Electrical Equipment Protection
Single-Phase Voltage Monitoring Relay ZUBR D2 40/63 A
Price includes 24% VAT · excl. VAT 34.52 € – 39.11 €
ZUBR D2 is a single-phase voltage monitoring relay designed for installation in an electrical distribution board. It protects electrical equipment in homes, offices and other buildings against overvoltage, undervoltage and dangerous voltage deviations caused by neutral conductor failure. When the mains voltage exceeds the selected limits, the relay disconnects the load and restores power after the voltage has returned to normal.
The relay is available as the ZUBR D2-40A and ZUBR D2-63A. It is suitable for protecting household appliances, heating equipment, refrigerators, air conditioners, computers and other devices sensitive to voltage fluctuations.
ZUBR D2 does not replace a Type 1 or Type 2 surge protection device (SPD). It complements distribution board protection by disconnecting the load during dangerous mains voltage deviations.
Main advantages of the ZUBR D2 voltage relay
- protection against overvoltage and undervoltage;
- protection against dangerous voltage deviations caused by neutral failure;
- designed for single-phase 230 V networks;
- available in 40 A and 63 A versions;
- accurate True RMS voltage measurement;
- adjustable upper and lower voltage limits;
- adjustable load reconnection delay;
- professional ProModel disconnection function;
- built-in overheating protection;
- alarm log for the last 100 events;
- digital display with adjustable brightness;
- compact two-module enclosure;
- installation on a standard DIN rail.
How does the voltage relay work?
ZUBR D2 continuously monitors the mains voltage. If the voltage falls below the selected lower limit or rises above the upper limit, the relay disconnects the connected load.
Once the voltage has returned to the permitted range, power is restored after the selected delay. This function helps protect refrigerators, heat pumps, air conditioners and other equipment sensitive to frequent switching.
The reconnection delay can be adjusted between 3 and 600 seconds. A delay of approximately two to three minutes is recommended for refrigerators and air-conditioning equipment.
True RMS and ProModel
True RMS technology provides accurate voltage measurement even when the waveform differs from an ideal sine wave. This reduces measurement errors caused by interference in the electrical network.
ProModel evaluates both the level and duration of a voltage deviation. This prevents unnecessary disconnection during brief and harmless fluctuations while ensuring a fast response to dangerous voltage conditions.
Overheating protection and alarm log
The built-in temperature sensor disconnects the load if the internal temperature of the relay becomes too high. Normal operation resumes after the temperature has fallen to a safe level.
The alarm log stores up to 100 recent events. It can be used to check when and why the relay disconnected the load, including overvoltage, undervoltage and overheating events.
Choosing the correct model
| Model | Rated current | Permitted current for up to 10 minutes |
|---|---|---|
| ZUBR D2-40A | 40 A | 50 A |
| ZUBR D2-63A | 63 A | 80 A |
The rated current applies to AC-1 loads. Equipment with a high starting current or loads exceeding the relay’s rated current must be controlled through a suitably rated contactor.
Installation
ZUBR D2 is installed inside an electrical distribution board on a standard 35 mm DIN rail. The device is 36 mm wide and occupies two standard modules.
Installation and electrical connection must be carried out by a qualified electrician. The voltage limits and reconnection delay must be selected according to the requirements of the protected equipment.
Technical specifications
- Product type: single-phase voltage monitoring relay
- Manufacturer: DS Electronics
- Model: ZUBR D2
- Available versions: D2-40A and D2-63A
- Electrical network: single-phase, 230 V
- Rated current: 40 A or 63 A
- Measurement method: True RMS
- Adjustable lower voltage limit: 120–210 V
- Adjustable upper voltage limit: 220–280 V
- Disconnection time during undervoltage: 0.1–10 seconds
- Disconnection time at very low voltage: no more than 0.04 seconds
- Disconnection time during overvoltage: no more than 0.04 seconds
- Load reconnection delay: 3–600 seconds
- Operating supply voltage: 100–420 V
- Overheating protection: yes
- Alarm log: 100 events
- Maximum conductor cross-section: 16 mm²
- Installation: 35 mm DIN rail
- Device width: 36 mm, two modules
- Protection rating: IP20