For your convenience, we have adapted the printed manuals into a user-friendly web format.
ZUBR voltage monitoring relay web-manuals library:
   •    Basic voltage monitoring relay ZUBR D
   •    Basic with thermal protection ZUBR Dt
   •    With maximum function ZUBR D2
   •    With maximum function plus current and power control ZUBR CV2 [2 screens]
   •    With maximum function plus current and power control ZUBR MF2 [3 screens]
   •    Voltage relay with touch buttons in socket ZUBR SR1
   •    Voltage relay in socket ZUBR R1
   •    Three-phase ZUBR 3F
Each manual includes a description of functions, wiring diagrams, and setup guidance — everything you need for proper installation and use.

Welcome to installation and operation web manual for ZUBR MF2

Multifunctional relay

— Protect a single-phase electrical equipment from voltage, current or total power deviations. The range includes models for 32, 40, 50, 63 A.

Content

Content

Technical data
Installation
Connection schemes
Exploitation
Possible issues and solutions
Exploitation

Technical data

Technical data

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The number of operating 
cycles under load
100 000 cycles
not less 10 000 cycles
The number of operating 
cycles without load
1 000 000 cycles
not less 500 000 cycles
Relay type
electro-
magnetic
polarized
Current measurement 
accuracy
0,5–63  А ±0,1–0,3 А
Voltage limits
upper 230–280 V,
lower 100–210 V
Switch-off time when
overvoltage occurs
not more than 0,03 sec
Switch-off time when
undervoltage occurs
0,1–10 c  | ≥ 100 V |
not more than 0,03 с  | < 100 V |
Supply voltage
100–420 V
Power consumption
not more than 0,35 kWt / month
Connection
wire cross section not more than 16 mm2
Device weight
0,19 kg ±10%
Overall dimensions
36 х 85 х 66 mm  (w х h х d)
IP to GOST 14254
IP20
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Installation

Installation

The device is intended for indoor installation. Minimize the risk of moisture and liquid ingress at the installation site. The ambient temperature during operation and installation should be between –5...+45 °С.

‍The appliance is installed in a special box, which allows to conduct the easy installation and operation. Cabinet should be equipped with standard mounting rail 35 mm width (DIN rail). The appliance takes in width of 2 standard module on 18 mm. The height of the appliance should be in the range 0,5...1,7 m from the floor.

‍For protection against short circuit and excess capacity in circuit load necessarily need to set in front of the appliance, the automatic circuit-breaker (QF), see schemes 1, 3. To protect person from electric shock 
leak is set safety shutdown device.

‍Terminals of the device designed for wire cross section up to 16 mm². Clean the end wires of 10±0,5 mm. It is advisable to use a soft wire, which is tightened in the terminals with a screwdriver with a tip width of no more than 6 mm with a torque of 2,4 N·m. A screwdriver with 
a blade more than 6 mm wide can cause mechanical damage to the terminals. Doing so will void your warranty claim.

Connection schemes

Connection schemes

‍Supply voltage (100 ~ 420 V, 50 Hz) served on terminals 1 and 2, phase (L) is connected to terminal location 1, the neutral conductor (N) to terminal 2.

‍The connecting voltage wires connected to terminal 3 and 4: phase (L) is connected to terminal location 3 and the neutral (N) to terminal 4. If a circuit without bypass of neutral through the device is used, then neutral is connected to terminal 2 or 4.

‍Important❗️ Before the installation and operation of the device, please read by the end of this document. This will help to avoid possible danger, mistakes, and misunderstandings.

Scheme 1. Electrical diagram with a neutral bypass 
in ZUBR
Scheme 2. Electrical diagram without a neutral bypass in ZUBR
Scheme 3. Wiring diagram with a neutral bypass in ZUBR
Scheme 4. Wiring diagram without a neutral bypass in ZUBR

Exploitation

Exploitation

‍When connected and during operation, the thermostat displays the current temperature of the remote sensor. If it is lower than the set temperature, the load is energized. In this case, the indicator lights up red.

‍Use "+" or "–" buttons to change the heating temperature. First, the screen displays the operating mode, then the set temperature of this mode.

If you want to securely protect the settings from children or unauthorized access, press and hold the "+" and "–" simultaneously for 6 seconds until "Loc" appears on the screen, or in case of unlocking, "unLoc" will appear.
When ZUBR is switched on, the screen first displays the parameter symbols, then the parameters themselves.
"U" — voltage network (V)
"I" — current (А)
"PF" — full power (kVА)
If the voltage is within the permissible limits, the load 
is switched on after the set delay time and the green indicator lights up.
"U" — voltage network (V)"I" — current (А)
"PF" — full power (kVА)
If the voltage is within the permissible limits, the load 
is switched on after the set delay time and the green indicator lights up.
When an event occurs, the type of event and its value will flash on the screen.
If the voltage deviates from the set limits, the load is disconnected. If the current or power limits are exceeded, the bottom screen will flash and the load will turn off after a delay.
When an event occurs, the type of event and its value will flash on the screen.
If the voltage deviates from the set limits, the load is disconnected. If the current or power limits are exceeded, the bottom screen will flash and the load will turn off after a delay.

Setting voltage limits

(factory setting 253 V and 198 V)
To see the upper limit press "+" button, lower limit press "–" button. To change it, use "+" and "–" buttons.
Important❗️ During voltage limits settings use technical documentation for protected equipment. All settings are stored in non-volatile memory.

Locking the controls

Hold down the "+" and "–" buttons for more than 
6 seconds until the message "Loc" / "unLoc" appears on the screen.

Log of events for 100 notes

The voltage relay stores the last 100 events — voltage, current, power, or thermal protection trippings in non-volatile memory. Thermal protection event additionaly include a record of the internal housing temperature. The numbering of events is organized as follows: "n 0" is the most recent event, while "n99" is the oldest.
The voltage relay stores the last 100 events — voltage, current, power, or thermal protection trippings in non-volatile memory. Thermal protection event additionaly include a record of the internal housing temperature. The numbering of events is organized as follows: "n 0" is the most recent event, while "n99" is the oldest.
To enter the log, "і" button for 3 secondsThe device displays the number of 
event records in the log. When released, the details of the last event (number, type, and value) are displayed. Use the "+" and "–" to view the log.
To enter the log hold "і" button for 3 sec
At first, the device displays the number of 
event records in the log. When released, the details of the last event are displayed (event number, type, and value). Use the "+" and "–" to view the log.
To reset the log while viewing it, hold down the "+" and "–" simultaneously until "Err rSt" appears. When you release the buttons, the log is cleared.
Examples of notes for different events
High voltage event
Power limit event
Current limit event
Over-heating event

Reset to Factory Settings

Hold the button "≡" for 30 sec until the "dEF" message appears on the screen. When you release the button, the settings are reset and the device reboots.

Temperature of the thermal protection sensor

To view the temperature, hold down "i" 
for 21 sec. This function is useful, 
for example, for assessing the degree of heating inside the housing and preventing overheating in advance.
Counter of operation cycles
To view, hold down "i" for 15 seconds. Required to estimate the number of power relay switchings and its demolition. It is not reset.

Menu button "≡"

Menu button "≡"

‍Press for 3 seconds to enter the menu. Use the same button to select a parameter. 
All parameter settings are described below.

‍Use the "+" button to change the parameters. 
The first time you press the button, the parameter blinks, the next time you press it, it is available for change.

‍The menu is exited in 10 seconds after pressing the buttons. The device first displays the symbols of the displayed parameters, then the parameters themselves.

✅ Basic settings [hold menu button for 3 sec]

✅ Advanced settings [hold menu button for 6 sec]

✅ Current settings [hold menu button for 9 sec]

Possible issues and solutions

Possible issues
and solutions

At turning on neither the indicator nor the screen don't light up

2. Screen normal voltage level, load is not turning on

3. The load switches off frequently

4. The load is disabled, "oht" flashes on the screen

5. Every 5 sec the screen displays "Ert"

6. The load is off, on the screen: "rEP Err"

Additional information

Additional information

Firmware version
Hold down "i" for 9 seconds. The version is displayed as a moving line. The manufacturer reserves the right to modify the firmware to improve the performance of the device. Print manual ZUBR MF2
version: d2.3.3G.34.9
Safety instructions
Warranty terms
Print manual
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