Eltom - RW 12 / 24 / 42 kV - 3-pole indoor load break switch

Indoor load break switches type RW and set of switch disconnectors with fuses type RW are used in indoor switchgears (voltage of 7,2-42 kV). They are designed to turn on and off currents do not exceed their rated current. The switch disconnectors with fuses type RWB have the ability to turn off short-circuit currents by cooperating with fuse disconnectors.

In the open state switches create the visible isolating clearance.

RW-type switches are three-pole devices with secant movement of blade of current path. The apparatus has modular design. The permanent contacts are made of copper flat, covered with a layer of silver. High technical parameters are the result of the applied solution of the main path coupled with arcing contact. Opening and closing the arcing contacts is delayed compared to the main contacts (movable). During the shutdown process, arc quenching occurs at the arcing contact. Quenching occurs due to the compressed air outlet, through a nozzle (automatically when opening) connected by rapid streching of the arc.

The speed of closing and opening of the disconnector is independent of the operating speed. This is ensured by a step mechanism when closing and a spring mechanism when opening. Reinforcement of the step and storage mechanism is carried out by means of a motor or manual drive, after which both mechanisms are simultaneously reinforced during the closing process. The load break switches RW can be driven by manual drives NR1-01, NRWO-4, NR-3 as well as by motor drives NS-EL 30-03, NSP 30-04.

modular design
the possibility of building the drives of plane and rotory motion of the string
the possibility of choosing the side of mounting the drive (left-right)
cooperation with motor drives NS-EL 30-03, NSP 30-04 and manual drives NR-1, NRWO-4, NR-3
reliability
high technical parameters
possibility of equipping the switch with reactance insulators 12; 17,5; 24, 42 kV, electromagnetic release 24; 48; 110; 220 V AC/DC, auxiliary contacts showing the position of the device

	PARAMETER	RW/RWB-12	RW/RWB-24	RW/RWB 42 kV
1	rated operating voltage	12 kV	24 kV	42 kV
2	rated frequency	50 Hz	50 Hz
3	DC rated current	630 A	630 A
4	operating switching capacity: in circuit with low inductance in circuit of ring network charging cables and outdoor lines off load transformers of low power	630 A 630A 50A 1250 kVA	630A 630A 25A 1250 kVA	630A 630A 25A 1250 kVA
5	max. current of fuse switch disconnector	200 A	200 A	200 A
6	rated short-circuit current	63 kA	63 A	63 A
7	withstand peak current	63 kA	63 kA	63 kA
8	withstand peak current 3 s.	25 kA	25 kA	25 kA
9	resistance of the current path	60 μΩ	65 μΩ	65 μΩ
10	test voltage (50Hz) for insulation: to earth and interpolar between the contacts	28 kV / 42GOST 35 kV	50 kV 60 kV	70 kV 85 kV
11	impulse test voltage for insulation: to earth and interpolar between the contacts	75 kV 85 kV	125 kV 145 kV	170 kV 195 kV
12	weight: without earthing switch with earthing switch set (cut-off switch with safety breakers)	26 kg 30 kg 37 kg	36 kg 40 kg 47 kg	50 kg 54 kg 61 kg
13	mechanical durability	2000 cycles	2000 cycles	2000 cycles