Universal Control and Safety Device UCMI 2











Uniwersalne Urządzenie Kontrolno-Zabezpieczające typu UCMI 2

Universal control and protection device type UCMI 2 (Universal Control and Measurement Instrument) protects against the effects of insulation deterioration in AC power networks with a rated voltage up to 1050 V, 50 Hz, including mine networks supplying mining equipment in explosion-proof casings.

UCMI 2 device can be used in:

  • transformer units,
  • compact stations supplying longwall equipment in underground mining plants,
  • flameproof transformer stations,
  • flameproof contactor switches,

The UCMI 2 device performs the following control and protection functions:

  • central-blocking leakage protection,
  • over-current protection (overload, short-circuit and asymmetric element)
  • temperature protection
  • protection of earthing continuity control
  • local non-intrinsically safe and intrinsically safe remote control
  • control of warning signaling
  • visualization on the LCD display of the measurement results and the operating status of the device
  • sending information about the operating status of the device to designated analysis points

The UCMI 2 device measures the insulation condition of the tested network, disconnecting it from voltage in the event of a decrease in the insulation condition and preventing voltage supply to a power network with a reduced insulation level. It also protects the network against the effects of overloads, short circuits, current asymmetry and exceeding the permissible temperature. The UCMI 2 device displays the insulation status, phase currents, temperature and voltage of the tested network on the LCD display.

The cooperation of the blocking element with the network is carried out by a certified set of artificial zero reactors from Izol-Plast.

Counteracting threats:
The universal control and protection device type UCMI 2 has been designed and is manufactured to counteract hazards in accordance with the Regulation of the Minister of Economy of December 22, 2005 on essential requirements for equipment and protective systems intended for use in potentially explosive atmospheres.(Dz.U. z 2005r. nr 263, poz. 2203).

Conditions for using UCMI 2:
The use of UCMI 2 device in potentially explosive atmospheres will be specified each time for devices in which it will be installed and meeting the following standards:

  • PN-G-42040:1996 -Protective and safety measures in mine power engineering – Leakage protection – Requirements and tests,
  • PN-EN 60079-1:2012 – Explosive atmospheres – Part 1: Protection of equipment with flameproof enclosures “d”,
  • PN-EN 60079-11:2012 -Explosive atmospheres – Part 11: Equipment protection with intrinsic safety “i”.



Technical data

Supply voltage:24 V ±20%, 50 Hz
Type of work:continuous
Power consumption:≤ 24 VA
The degree of protection of the housing:IP 40
External dimensions:122 x 106 x 205 mm
Contact load:2.5 A / 230 V
Mass:3 kg



Rated data

UCMI operating conditions 2:

Rated voltage of the controlled networkUn ≤ 1050 V
Voltage fluctuations0.8⋅Un < Un ≤ 1,2⋅Un
The content of higher harmonics≤ 5%
Mains frequency fluctuation± 4%
Presence of DC voltages in the networklack
Allowable capacity of the controlled network 1 µF per phase
Height above sea level-2000 m ÷ 2000 m
Ambient temperature-10 oC ÷ 70 oC
Relative humidity at temperatures up to 40oC95%
Max. relative humidity up to 25oC or at lower temperatures with condensation100%
Air surrounding the protectionFree from water, dust and chemically active gases
Mechanical vibrations at the mounting pointSinusoidal vibrations with an amplitude of 0.5 g in the frequency range 5 ÷ 35 Hz
Air surrounding the protectionFree from water, dust and chemically active gases
The location of the deviceany


Network insulation resistance measuring circuit parameters:

Output voltage of the measuring circuitUn = 25 V DC
Output current of the measuring circuitIn = 0,25 mA
Output capacity of the measuring circuitCo max = 5 µF
Output inductance of the measuring circuitLo max = 600 H
A feature of the intrinsic safety of the circuitnon-ignition circuit
Resistance measuring range0 ÷ 100 kΩ
Resistance setting range for the activation threshold1 ÷ 99 kΩ
Resistance setting range for the return threshold1 ÷ 99 kΩ
Low insulation alarm threshold1 ÷ 99 kΩ
Insulation resistance measurement compensation0 ÷ 99 kΩ
Setting range of the time delay of the resistance measuring element5 ÷ 1000 ms


Output parameters of intrinsically safe circuits:

Output voltage of the measuring circuitUo = ±11,7 V
Output current of the measuring circuitIo = ±16,6 mA
Output power of the measuring circuitPo = 48 mW
Input inductance of the power circuitLi = 0 H
Input capacity of the measuring circuitCi = 0 F
Output inductance of the measuring circuitLo = 0,65 H
Output capacity of the measuring circuitCo = 5 µF


Parameters of the current measuring circuit:

Input measuring voltage0 ÷ 8 Vrms
Rated current setting range In30 ÷ 800 A
Transformer ratio setting range N0,1 ÷ 25,5 mV/A
Setting range of the short-circuit module W2,5 ÷ 10
The activation threshold of an asymmetric element0,5 In
Setting range of an asymmetric element L30 ÷ 100%
Setting range of the time delay of the short-circuit module5 ÷ 70 ms
Time delay setting range of an asymmetric element5 ÷ 200 ms
Current limitation30 ÷ 2000 A
Setting range for the time delay of the current limitation element5 ÷ 200 ms
Setting range for the time delay of the overload element0 ÷ 120 min



The dimensions of UCMI 2 are shown in the adjacent drawing.
The steel housing, consisting of a cuboid consisting of a top, bottom and side walls, as well as a removable front and back cover, is protected with anti-corrosive coatings.

On the front cover there is a sight glass for observing the liquid crystal display and buttons: “⇐”, “⇒”, “ESC”, “OK” for changing the parameters of the device as well as LEDs indicating the operating status of the device. On the back of the housing there are three sockets for connecting the device.

The UCMI device should be securely attached to the supporting structure in a housing (ordinary) of at least IP 54 protection or a flameproof housing (e.g. in the low voltage apparatus chamber of mine, mobile transformer stations of explosion-proof or shielded construction), using 2 bolts. Electrical connection should be made by trained personnel, in accordance with technical drawings and technical documentation. The figure below shows the connection diagram of the UCMI 2 device with a vacuum contactor.

Assembly diagrams of IT3Sm- * * / * / * R-U2 transformer stations with UCMI 2 protection or PM2 type protection with vacuum contactor:

Diagram of the IT3Sm-1 * / * / * R-U2 single-outlet station

Diagram of the IT3Sm-2 * / * / * R-U2 two-outflow station


On 09/08/2014 universal control and protection device type UCMI 2 received the EC-type examination certificate: FTZU & nbsp; 11 ATEX 0145X Physical-Technical Testing Institute (Fyzikálne technickz zkusebni ustav, sp), Notified Body No. 1026 in accordance with Article 9 of the Council Directive 94/9 / EC of 23 March 1994, certifies that the above-mentioned device or protective system has been checked for compliance with the basic safety and health protection requirements regarding the design, construction of the device and protective system intended for use in conditions potentially explosive atmospheres listed in Annex II to this Directive.
Based on the Technical Opinion No. OBAC / 591 / TE / 12 of 18.01.2013 of the OBAC Attestation and Certification Center, it is stated that the UCMI 2 universal control and protection device complies with the general design solutions technical requirements. Detailed information can be found in the above-mentioned technical opinion.
The universal control and protection device UCMI 2 can be used in power supply stations for frequency converters.

The basic requirements of safety and health protection were implemented by meeting the requirements of the following standards:

  • PN-EN 60079-0:2012
  • PN-EN 60079-11:2012

The universal control and protection device of the UCMI 2 type is marked:
FTZU 11 ATEX 0145X
I (M1) [Ex ia Ma] I



Download the catalog card:

Universal UCMI control and protection device-2

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