Voltage relay with current control

Voltage relay with current control ZUBR CV2-40 is a compact voltage and current relay that combines the best functionalities of several devices

The voltage relay protects devices from overvoltage, undervoltage , loss of neutral , and limits current or active power .
If the current or power limit is exceeded, the relay switches off the load with a specified delay time.

TrueRMS – high-precision voltage measurement

The TrueRMS algorithm reduces the impact of noise and distortion on measurement accuracy in situations where the voltage is not a perfect sinusoidal shape.
Thanks to this, the voltage relay switches off the load before voltage pulses can damage the equipment.

Power-off delay

Modern devices can withstand short-term voltage fluctuations. The device's ProModel mode helps prevent unnecessary shutdowns:

• If the voltage deviation is small or short-lived, the relay will not turn off the device .

• The device remains operational within limits that are safe for the equipment.

This reduces the number of load shedding events and extends the life of the equipment.

Overheating protection

A temperature sensor inside the housing protects the relay from overheating:

• At temperatures above 80 °C , the load is switched off and “ danger ” appears on the display.

• When the temperature drops below 60 °C , operation is restored and the load is switched on.

If the protection is activated more than 5 times a day , the device will lock until the temperature returns to normal and the user presses any button.

Viewing the temperature:

• During overheating, press the i button.

• If there is no overheating, hold down the i button for 21 seconds .

Restart delay after a crash

The factory-set minimum switch-on delay is 3 seconds (adjustable from 3 to 999 s).
This delay protects sensitive devices (refrigerators, air conditioners) from frequent switching on.
Recommendation:

• For refrigerators/air conditioners 2-3 minutes

• Other devices may experience a smaller delay

It is also possible to select another operating mode: the delay starts from the moment the voltage relay turns off , not from the moment the voltage stabilizes.

Alarm log – up to 100 events

The log stores the last 100 protection activations (for example, voltage level at the moment of shutdown, activation of overheating protection).
The log is in non-volatile memory.

Easy and convenient use

• The connection terminals are standardized and convenient.

• The setup is done with three buttons .

• The fourth button “ i ” displays the alarm log and explanations of menu abbreviations.

• The digital display continuously displays voltage and other system readings.

• The screen brightness and standby display are adjustable.

Easy installation

The ZUBR CV2 voltage relay with current control takes up only 2 DIN modules in the electrical panel.
Mounts on a 36 mm wide DIN rail.

If the installation location is humid or water may get into the device, the shield must have an IP55 protection class.

Additional configuration options

1. Undervoltage shutdown delay

Suitable for networks where there are frequent voltage drops and the relay tends to intervene frequently.
The adjustable delay of the undervoltage protection allows you to reduce unnecessary interruptions.

The delay applies to:

• ProModel ON → 154…176 V

• ProModel OFF → 120…210 V

In other cases, the manufacturer's fixed shutdown times apply.

2. Adjustable hysteresis (by voltage)

When the voltage fluctuates near the set limits, hysteresis helps reduce the number of voltage relay trippings.
The relay will only turn back on when the voltage exceeds the set limit + hysteresis value .

3. Protection against too frequent shutdowns

The protection prevents a situation where a sensitive device (refrigerator, air conditioner) turns on and off too often.

If the maximum number of consecutive shutdowns is reached:

• relay locks ,

• the load is switched off ,

• the user must intervene.

Reasons:

• loss of neutral wire;

• voltage instability;

• too narrow limits → it is necessary to expand the limits or increase the hysteresis.

Technical data of the voltage relay with current control ZUBR CV2:

Parameter	Value
Product category	Voltage relay with current limitation
Current (A)	40 A
Installation	DIN rail (36 mm)
Number of phases	1 (230V)
Thermal protection	Yes
TrueRMS	Yes
ProModel delay	Yes
Lower voltage	120-210V
Upper voltage	220-280V
Power	8,800 VA
Undervoltage shutdown	0.1-10s (>120V), ≤0.04s (<120V)
Overvoltage shutdown	≤0.03s
Main current limitation	0.1-40A
Active power limitation	0.1-8.8kW
Switching capacity	40 A (50 A up to 10 min)
Power-on delay	3–999 sec.
Shutdown delay	0–240 sec.
Relay type	Polarized
Supply voltage	100-420V
Wire cross-section	up to 16 mm²
Weight	0.19 kg
Dimensions	36 × 85 × 66 mm
Number of switching operations with load	≥10,000
Number of switching operations without load	≥500,000
Protection class	IP20