Flameproof compact station type MSL-1203

The compact station type MSL 1203 is a switching device designed for underground mining, to remotely control electric drives of mining machinery and equipment, powered by a three-phase alternating current network with an insulated star point of the transformer (IT network).

The increased degree of functional safety is achieved by means of a suitable connection path for overload and short-circuit protection, leakage protection, protective conductor continuity control, receiver temperature (PTC), control and instrument relays, interrupters.

The main compartment cover is equipped with a Quadrangular control panel with a sight glass to view all the parameters of the station operation on the internal LCD monitor. There is an emergency stop switch on the main compartment lid to disconnect the supply voltage from all loads powered by the station. The device is equipped with galvanically separated three power circuits equipped with a hand-operated disconnector switch.

The outgoing feeders are controlled and monitored by means of:

  • individual control and measuring modules,
  • multifunction relay type PMB.

The device can be equipped with main outgoing feeders, lighting outgoing feeders supplied from a transformer up to 6.3 kVA, a power transformer up to 75 kVA and auxiliary outgoing feeders. The power supply can be supplemented by a starter with a current corresponding to the maximum current of the disconnector with a supplementary bypass contactor.

The device contains an integrated PLC, which is responsible for controlling and supervising the outgoing feeder. Data transmission is carried out via intrinsically safe modules, Ethernet communication interfaces, RS485, RS422, RS232, CAN etc. suitable for transmission via copper wire and optical fibre cables. The components used ensure reliable operation of the compact station in the underground mining, while meeting increased safety requirements.


  • three independent current circuits,
  • up to eight independently protected outgoing feeders,
  • local or remote control,
  • clear operating status visualisation,
  • small overall dimensions,
  • Individual protection for each contactor, transformer or starter set,
  • easy access to station internal equipment,
  • protection by disconnecting the power supply to the compact station when attempting to open the connection compartment or the auxiliary compartment.
Ognioszczelna stacja kompaktowa typu MSL-1203

Explosion protection

I M2 Ex d [ia Ma] [ib Mb] I Mb
I M2 Ex d e [ia Ma] [ib Mb] I Mb
I M2 Ex d [ia Ma] [ib Mb] [op is Ma] I Mb
I M2 Ex d e [ia Ma] [ib Mb] [op is Ma] I Mb
PB Exd[ia][ib]I
PП Exde[ia][ib]I
PB Ex d [ia Ma] [ib Mb] [op is Ma] I Mb X

TC BY/112 02.01. 103 00150
TC RU C-PL.ME92.B.01062

Rated values

Ingress protection rating
IP54 / IP65

Ambient temperature
-10°C ≤ Ta ≤ +40°C

Rated insulation voltage
500 (690) V AC, 1000 (1140) V AC

Rated switching voltage
230/400/500/690/1000/1140 V AC

Rated continuous current
1200 A

Rated thermal current of the disconnect circuit (incoming feeder)
up to 800 A

Rated outgoing feeder switching current
50, 80, 100, 200, 400, 450 or 500 A

Number of outgoing feeders
Number of circuits: 3 (6)
Number of main outgoing feeders: limited by the maximum incoming feeder current

Auxiliary transformer power
6,3 kVA

Transformer power
75 kVA

Configuration of contactor operation
single-speed, two-speed, reversible, star-triangle, parallel, serial, automatic phase sequence change

(W x H x D) 1130x605x560 mm
(W x H x D) 1245x605x560 mm (with grommets)
(W x H x D) 1575x605x560 mm
(W x H x D) 1815 x605x560 mm (with grommets)

1200..2100 kg


M S L 1 2 0 3 . * * / B P


circuit I, II, III, …, VI with the following types of outgoing feeders:

* = 1 – with single contactor outgoing feeders
* = 2 – with transformer outgoing feeders
* = 3 – with release outgoing feeders
* = 4 – with reversible outgoing feeders
* = 5 – with double contactor outgoing feeders
* = 6 – with transformer outgoing feeders up to 6.3 kVA
* = 7 – with transformer outgoing feeders up to 75 kVA
* = 8 – with starter outgoing feeders

There may be different types of outgoing feeders in each circuit, in which case it should be part of the designation in brackets next to the basic designation.

Example: MSL1203.1 (5). 1.7/BP is a station equipped with three circuits, of which circuit I has single and double contactor outgoing feeders, circuit II has single outgoing feeders and circuit III has transformer outgoing feeders 75 kVA.