DRIESCHER B843 Service manual

B843
ELEKTROTECHNISCHE WERKE
FRITZ DRIESCHER & SÖHNE GMBH
D-85366 MOOSBURG • PHONE [phone] • FAX [phone]
http://www.driescher.de [e-mail]
Mounting and operating
instructions for
DRIESCHER
Low voltage -
fused-
switch disconnector
system 403
Rated current 400 up to 1445 A

Low voltage-fused-switch disconnector system 403
B843
Table of Contents
1 Introduction 4
1.1 Notes on this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1.1 General note 4
1.1.2 Use of symbols / legend 4
1.2 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1 General 4
1.2.2 Operating conditions 5
1.2.3 Scope of delivery 5
1.2.4 Assemblies and functional elements 403 6
1.2.5 Operating elements 7
2 Safety 8
2.1 Intended use / guarantee . . . . . . . . . . . . . . 8
2.2 Personnel selection and necessary qualifications . . . . . . . . . . . . . . . . 8
2.3 Organisational safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Dangers caused by the switching device . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4.1 Danger due to moving parts 9
2.4.2 Danger due to electrical current/ arc 9
2.5 Safety installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 ASSEMBLY 10
3.1 Transporting the switching device. . . . . . . . . . . . . . . . . . . . . 10
3.2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Assembly on the frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Assembly on a busbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 Connecting the switch cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.6 Functional check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Insert fuses - Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.8 Disassembly /removal low voltage-fused-switch disconnector system 403 . . . . . . 14
2 / 16

Table of contents
4 Operation 14
4.1 Work station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Visual check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.1 Commissioning 15
4.2.2 Operation 15
4.2.3 Temporary decommissioning 15
4.2.4 Decommissioning 15
5 TECHNICAL DATA 16
5.1 Service address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Disposal 16
Low voltage-fused-switch disconnector system 403
B843
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CE marking
The DRIESCHER low-voltage products are subject to the CE marking requirement in connec-
tion with the Low Voltage Directive 2006/95/EC.
The CE mark is applied to the individual packaging units.
In doing so, DRIESCHER confirms that the products comply with the applicable regulations.
The corresponding declarations of conformity are stored with DRIESCHER.

Low voltage-fused-switch disconnector system 403 Introduction
B843
4 / 16
1 Introduction
Thank you for choosing one of our products. We hope it gives you many hours of successful and pro-
blem-free operation.
The low-voltage-fused switch disconnector system 403 has been specially designed and manufactu-
red to meet your requirements.
Do you have any questions you would like to ask us? We look forward to hearing from you.
1.1 Notes on this manual
1.1.1 General note
This operating and maintenance manual contains all information and descriptions required to operate
the Earthing switch. This document was created with the utmost care. Any suggestions or comments
would be gratefully received.
To make the instructions in this manual easier to follow, the descriptions are accompanied by figures
and schematic diagrams of the switching device or its assemblies.
1.1.2 Use of symbols / legend
The following symbols are used in this manual in addition to the warning notices outlined in the chapter
Safety:
WARNING:Warns of danger to people. Failure to comply with the warning indicated
by this symbol will result in severe injuries.
Warns against damage to property and personal injury caused by mechanical com
ponents. Failure to comply with the indications marked with this symbol will result in
serious injuries.
Warns against damage to property and personal injury caused by electrical voltage or
arc. Failure to comply with the indications marked with this symbol will result in serious
injuries.
Caution: Failure to comply with the warning indicated by this symbol could result in
injuries.
Attention: Warns of possible material damageor malfunctions. Technical information
requiring particular attention.

Low voltage-fused-switch disconnector system 403 Product description
B843
1.2.3 Scope of delievery
Low voltage-fused-switch disconnector system with sliders
cable insulating cover (L) (optional)
1.2.2 Operating conditions
The information is valid for the described installation situation (vertical installation on horizontal busbar
system) and for the ambient conditions "interior" according to the standards IEC/EN 61439-1/2/3/5.
5 / 16
1.2 Product description
1.2.1 General
The low voltage-fused-switch disconnector system 403 has been specially designed and manufactu-
red to meet the requirements of our customers. They have been in trouble-free use for years.
The correct choice of busbars and components is the responsibility of the operator and operator of the
new standard IEC or DIN EN 61439 describes as a successor standard to DIN EN 60439 the design
and inspection specifications for low-voltage switchgear combinations, where planning, construction
requirements and the required type-approvals are prescribed. In order to safely eliminate hazards for
people and goods when handling electrical energy, the expert handling of the equipment and compli-
ance with the applicable regulations is generally required.
Installation and maintenance work, modifications and retrofitting may only be carried out by qualified
personnel in compliance with the general installation and safety regulations for work on power plants
(including 5 safety rules). The state of the technology and the impairments of the components among
themselves must be taken into account. In general, it is important to ensure that all touchable compo-
nents are switched off without voltage during maintenance measures.
In addition, it is necessary to ensure that the screw connections are made with the prescribed tighte-
ning torques, that the respective fittings are used and that the elements for contact protection are fully
available
The low voltage-fused-switch disconnector system shall be used and operated according to the inten-
ded use.
We would like to point out that the technical description in the product brochure as well as the assem-
bly instructions must always be observed and stored for maintenance work, modifications and retrofits.
Modifications for further development and technical progress are reserved.

A Low voltage-fused-switch disconnector system 403
B Slider 1-pole
C Low-voltage high-rupturing-capacity fuse DIN 43620
D Indicator plate HRC fuse dimension
E Latching lever for the supports
F The supports HRC fuse
G Marking plate
H Switchroom with guide for slider
I Type plate
J Cable connection bar bottom L1, L2, L3
J1 Cable connection bar top L1, L2, L3
K Insulating baffle plate
L Cable insulating cover
M Inspection holes
N Flat spring
O Busbar contact
P Mounting brackets for frame mounting
Q Slider 3-pole
R Slider 3-pole with operating handle
S Terminal screw M12, caulked
6 / 16
Low voltage-fused-switch disconnector system 403 Product description
B843
1.2.4 Assemblies and functional elements 403
B
G
D
H
I
J
K
A
M
L2
L1
L3
L
Q
R
S
N
CD
O
P
P
O
O
E
F
Connection above
Connection lower
Pic. 1: Low voltage-fused-switch disconnector system 403, right cross section
Pic. 2: Low voltage-fused-switch disconnector system 403 ,
left 3-pole, right 3-pole with operating handle switchable
J1
L1
L2 L3
K

7 / 16
Low voltage-fused-switch disconnector system 403 Product description
B843
1.2.5 Operating elements
Low voltage-fused-switch disconnector system 403 - 1-pole, 3-pole and 3-pole with operating handle
switchable. Slider (B) with recessed grip above and down with inserted low-voltage high-rupturing-
capacity fuse (C).
1-pole switchable 3-pole switchable
with operating handle
3-pole switchable
Pic. 3: Operating elements
H
R
Q
B
C
B Slider 1-pole
C Low-voltage high-rupturing-capacity fuse DIN 43620
H Switchroom with guide for slider
Q Slider 3-pole
R Slider 3-pole with operating handle

Low voltage-fused-switch disconnector system 403 Safety
B843
2 Safety
2.1 Intended use / guarantee
The low voltage fused disconnector sysytem is intended for use under the conditions outlined in the
section Technical data, on Page 16.
Any use other than those outlined in this section is classed as an unintended use.
Any of the following carried out without express written approval from the manufacturer
• alterations or extensions
• using non-genuine spare parts
• repairs carried out by companies or persons not authorised by the manufacturer
could result in the guarantee becoming null and void.
2.2 Personnel selection and necessary qualifications
Persons working with the switching device must
• be at least 18 years of age.
• have received sufficient training for the relevant tasks.
• be familiar and comply with the current valid rules and safety regulations.
The owner must ensure that only authorised personnel work on the switching device.
Personnel learning to use or being introduced to the device, or operating the device as part of training
may only work on the switching device when supervised by an experienced member of staff!
All work on the switching device may only be carried out by trained specialist personnel (DIN VDE
0105-100) and in compliance with all valid regulations specified in the accident prevention regulations
(UVVen).
2.3 Organisational safety
The owner must ensure that this operating and maintenance manual is always in the immediate vici-
nity of the persons responsible for assembling, operating and carrying out maintenance work on the
switching device
8 / 16

9 / 16
Low voltage-fused-switch disconnector system 403 Safety
B843
2.4 Dangers caused by the switching device
The possible danger sources of the switching device are outlined below. Thorough introductory ses-
sions and training for operators help minimise the danger to both people and equipment.
Carrying out regular checks on the knowledge levels and compliance with safety regulations contribu-
tes significantly to accident-free operation over the long term.
2.4.1 Danger due to moving parts
WARNING: The switching device has moving components, some of which can be moved remotely
(electrically and/or mechanically) with significant force. Touching these parts poses a risk of personal
injury or material damage.
Before starting work, it is important to ensure that there is no danger from moving parts.
2.4.2 Danger due to electrical current / arc
WARNING: When operating electrical switching devices, components in the immediate vicinity are
supplied with dangerous current. Touching these parts poses a risk of personal injury or material
damage.
In the case of a fault arc, extreme hazards arise (high thermal energy, pressure wave, electromagnetic
radiation, toxic / hot gases and particles).
The danger zone of the switching device may only be accessed by persons who are aware of the elec-
trical dangers thanks to specialist training, knowledge and experience and can implement the neces-
sary occupational health and safety measures.
Other people may only enter the danger zone when accompanied by the persons listed above.
2.5 Safety installations
For the protection of both personnel and the product, safety installations help prevent accidents or
material damage caused by moving parts and assemblies.
Safety installations are Insulating baffle plate (K), Cable insulating cover (L) and Flat spring (N).
The operator must ensure that trained personnel
• check all safety installations regularly.
• remove any problems on the safety installations immediately.
• secure the switching device against being switched on if not all safety installations are present and
working.

Low voltage-fused-switch disconnector system 403 Assembly
B843
3 Assembly
3.1 Transport and storage of the low voltage-fused-switch disconnector system 403
For transport and assembly, only mount the low voltage-fused-
switch disconector system 403 from the outside, do not grip it into
the system from the back, bottom or top.
Protect the low voltage-fused-switch disconnector system from
damage, moisture and contamination until it is installed.
3.2 General
The low voltage-fused-switch disconnector system 403 must be installed in a suitable housing and
must be protected against contamination. The installation position is vertical. The installation of the low
voltage-fused-switch disconnector system 403 on under-voltage busbars is carried out with a insula-
ting socket wrench tested in accordance with EN 60900 (DIN VDE 0682 Part 201) or EN 61477 (DIN
VDE 0682 Part 130).
For live-line working, the provisions of DIN VDE 0105 Part 1 must be complied with. Live-line
working may only be carried out by specially trained specialists.
Please refer to the Safety Tools instructions for use (Order No. 3-81301043).
Insulating socket wrench scope of delievery:
Pic. 4
10 / 16
Top side
Back side
Bottom side
Pos. Part-No. Length / Socket wrench Description
1a 2-840 31005 300 mm, Set Pos. 2 - 5
Ratchet wrench, fully insulated according to
VDE, scoop-proof up to 1000 V according to
097429 for nut, detent edged ring and washer
1b 2-840 31006 300 mm, Set Pos. 2 - 4, 6
Ratchet wrench, fully insulated according to
VDE, scoop-proof up to 1000 V according to
097429-002 for nut and tension washer
22-319 00013 1/2 “
Ratchet wrench for right and left batter, accor-
ding to DIN 7449 1/2 “, isolated,
Observe the instruction manual ratchet!
Order-no.:3-81301043
32-611 37790 250 mm, 1/2 “ Extension DIN 7449 1/2 “, isolated,
42-319 0023 SW 13, 1/2 “ Socket wrench SW 13 (M8) 1/2 “,
isolated, for assembly on the frame
52-840 31001 SW 19, 1/2 “
universal joint SW 19 (M12) 1/2 “,
isolated, for busbar mounting with the
supports for nut, detent edged ring and washer M12
62-840 31002 SW 19, 1/2 “
universal joint SW 19 (M12) 1/2 “,
isolated, for busbar mounting with
the supports for nut und tension washer M12

Low voltage-fused-switch disconnector system 403 Assembly
B843
11 / 16
3.3 Assembly on the frame
Low voltage - fused-switch disconnector system type 403 / 400 A - 1445 A are mounted with 2 screws
M8 on the frame. The busbars are supported by system 403.
Working cycle:
1. Remove the slides for LV-fuses on system 403 (Pic. 7).
2. Putting the 403 system on the frame.
3. Fixing the system 403 (Pic. 5 and 6). Tightening torque 30 Nm.
4. Connect the cable. (see chapter 3.3.2 page 13)
5. Integrate the cable insulating cover (L) (Pic. 7) at the cable feeder.
Pic. 5: 403 system mounting
situationon a frame
Pic. 6: Insulating plug-in-lever with
socket spanner insert SW 13
Slider, (B)
caulked screw M8
DIN 933
Frame Mounting bracket 403
Hexagonal nut DIN 934
Mounting brackets for frame mounting, (P)
Screw M8 DIN 933 /
Length depending on frame
Flat washer DIN 6796
Frame Mounting bracket 403
Tension washer DIN 6796
Hexagonal nut DIN 934
Pic. 7: Cable insulating cover (L)
or

12 / 16
3.4 Assembly on a busbar (de-energized)
For mounting necessary hexagonal nut, tension washer (Pic. 11) and detent edged ring must be attached
on the connecting element fixed on the cardan-joint insert (see pic. 10), so that it can be accurately led while
fixing on the connecting screw (M12).
The not isolated cardan-joint insert is addtional fixed with a setscrew on the socket wrench, that the
insert can not be removed unintentionally.
As shown in Pic. 9, the insulating socket wrench is led on the caulked-connecting screw of the busbar
contact and the screwed connections are properly assambled.
Working cycle:
1. Remove busbar insulating cover. (Pic. 8)
2. Remove the slides (B) for LV-fuses on system 403. (Pic. 9)
3. Ingerate the cable insulating cover (L) (Pic. 7) on system 403 to prevent
unintentional contact.
4. Put system 403 on the frame.
5. Fix system 403 (Pic 9, 10 or 11).
Tightening torque 75 Nm.
6. Remove cable insulating cover (L) (Pic. 7) at the cable feeder.
7. Connect the cable. (see chapter 3.3.2 page 13)
8. Integrate the cable insulating cover (L) (Pic. 7) at the cable feeder.
Pic. 9: 403 System mounting situation
on the busbar
Pic. 11: Insulating socket wrench with socket SW
19 with nut and tension washer
Slider, (B)
Mounting brackets for busbar mounting (O)
Pic. 8: Busbar insulating cover
Hexagonal nut DIN 934
Detent edged ring DIN 127
Washer DIN 125
Connecting element
Hexagonal nut DIN 934
Tension washer DIN 6796
Connecting element
Pic. 10: Insulating socket wrench with socket SW
19 with nut, detent edged ring and washer
Low voltage-fused-switch disconnector system 403 Assembly
B843

13 / 16
Low voltage-fused-switch disconnector system 403 Initial commissioning
B843
3.5 Connecting the switch cables
Insert insulating baffle plate (K) into the appropriate fasteners (Pic. 14).
The cables shall be laid over cable lugs or terminal in such a way that there is no mechanical
stress(twisting, thrust, pressure, etc.) on the connecting bars (J). The connection screws (S) M12 are
caulked in the copper busbar.
When tightening (max. tightening torque 65 Nm) and when loosening connected cables, the screw
head must be counter-held with a ring spanner or spanner SW19 (Pic. 12 and 13).
The connecting bars (J) must not be twisted or bent under any circumstances. The caulked
connection screws (S) must not be removed.
Furthermore, a connection with V-direct connection terminals or flat direct connection termi-
nals is possible, for this the manufacturer's specifications must be observed!
After this the cable insulating cover (L, Pic.7) can be mounted.
Pic. 14: Insulating
baffle plate (K)
Pic. 12: Cable connection
above
Pic. 13: Cable connection
below
Pic.15: Screw connection for cable connection
Cable connecting bar (J)
For use with cable lug or bar
width ≥ 30 mm
Screw M12 DIN 933 /
caulked
Washer DIN125
Detent edged ring DIN 127
Hexagonal nut DIN 934
Hexagonal nut DIN 934
Tension washer DIN 6796
Delivery status from 05/2016
For use with cable lug or bar width ≥ 30 mm
Ring spanner or spanner SW19
Insulating baffle plate
Insulating baffle plate

3.7 Insert low-voltage high-rupturing-capacity fuse - change
Select appropriate HRC fuse (C). Push the latching lever (E) at the slider (B)
in the direction of the arrow. (see Pic. 17)
Insert fuse with the retaining bracket into the supports (F) ,
then realease the latching lever(E). The HRC fuse inserts can be used
for which slider, see the HRC fuse dimension(D) sign on the low volta-
ge-fused-switch disconnector system.
1
2
Low voltage-fused-switch disconnector system 403 Initial commissioning
B843
14 / 16
3.6 Functional check
After the Low voltage-fused-switch disconnector system 403 is
installed, the cables are connected and the insulating baffle
plate (K) (see Pic. 14) is inserted, the flawless mechanical func-
tion must be checked with a slider (B) without HRC fuse.
In addition, the correct fit of the flat spring (N) must be checked
(see Pic. 16). Then apply the cable insulating cover (L) (Pic. 7).
3.8 Disassembly / Removal low voltage-fused-switch disconnector system 403
For the disassembly of the low voltage-fused-switch disconnector system 403, the steps mentioned
on page 11 and 12 assembly must be carried out in reverse order.
Here, too, observe the safety regulations for live-line working if the existing reserve places are
equipped in low voltage systems.
Flat
spring
(N)
Pic. 16: Inspection
flat spring (N)
Pic. 17: Slider with HRC fuse
D
BF
E
C
4 Operation
4.1 Work station
The owner must ensure that the work station complies with all valid regulations and has sufficient ligh-
ting.
4.2 Visual check
WARNING: Missing or loose components could result in personal injury or material damage.
Check that all mechanical components are complete and secured in place. If faulty or loose mounting
parts are detected on the switching device, it may only be commissioned again after it has been repai-
red by an expert.
A check must be carried out to ensure that the safety installations are complete and functional (see
chapter 2.5) prior to commissioning.
12
B
Attention
Only for HRC fuses
DIN 43620
Insert .... dimension!

15 / 16
Low voltage-fused-switch disconnector system 403 Operation
B843
4.2.1 Commissioning
Once the entire assembly and successful functional check are complete, the switching device is ready
for use.
4.2.2 Operation
Insert slider (B) with fuse (C) into the switchroom (H) . Slider is now in „Stand by position“. Press
the slider into the low voltage-fused-switch disconnector system via the spring pressure , then press
quickly to limited stop . During the switch-off process, actuate quickly upwards , the slider is now
back in „Stand by position” . When actuating, use the recessed grip at the top and bottom of the sli-
der. For slider 3-pole with actuating handle, use both hands (Pic.19).
4.2.3 Temporary decommissioning
In order to temporarily decommission the switching function of the low voltage-fused-switch discon-
nector system, the sliders (B) must be placed in "stand by position".
4.2.4 Decommissioning
The low voltage-fused-switch disconnector system can be shut down by removing the sliders.
„Stand by position“
„Stand by position“
ON
OFF
Pic. 18: Switch on- and off process Pic. 19: Handling 3-pole with
operating handle
1
1
2
4
3
5
2
3
5
4
D

16 / 16
Low voltage-fused-switch disconnector system 403 Technical Data
B843
5 Technical Data
Switch type Low voltage-fused-switch disconnector system 403
audited according to VDE 0660/107 - IEC/EN 60947-1/-3)
Rated operational current Ie400 A 630 A 910 A
Rated operational voltage Ue400/500/690 V AC 400/500/690 V AC 400 V AC
Rated frequency 50 Hz 50 Hz 50 Hz
Rated insulation voltage Ul1 kV 1 kV 1 kV
Rated impulse withstand voltaget Ulmp 12 kV 12 kV 12 kV
Rated conditional short-cirquit current 100 kA 100 kA 50 kA
Rated conditional short-cirquit current Dimension 1 - 2 Dimension 2 - 3 Dimension 3
Permissible ambient temperature -25° C up to + 55° C -25° C up to+ 55° C -25° C up to + 55° C
Degree of protection IP 2X IP 2X IP 2X
Discharge current- bedewed actation 0,2 mA 0,2 mA 0,2 mA
Mechanical switching cycles 5.000 5.000 5.000
Elektrical switching cycles 500 500 500
Utilisation category according to EN 60947-3 AC-22B AC-22B AC-22B
Degree of pollution 3 3 3
Rated reduction factor (RDF) 1,0 1,0 1,0
Temperature range -25° up to +55° C
Site altitude max. 2000 m over NHN
Relative humidity, maximum daily average 95 %
Relative humidity, maximum monthly average 90 %
Water vapour pressure, maximum daily average 2,2 kPa
Water vapour pressure, maximum monthly average 1,8 kPa
Storage conditions dry and dust-free -40°up to +60°Celsius
Operating ambient conditions according to EN 62271-1
Storage conditions
5.1 Service address
Our specialist personnel can be contacted by telephone in the event of faults or to answer any ques-
tions you may have with regard to the compatibility, assembly or maintenance, including outside busi-
ness hours.
Please always provide the information on the identification plates.
Phone [phone] E-Mail [e-mail]
11-2019 • Part-No.: 3-81201043 • V2
6 Disposal
The switching device must be dismantled by qualified personnel.
It must be disposed of in an environmentally-friendly manner. Electrical components must not be
disposed of as household waste. 2002/96/EC(WEEE)