Safety Switches
NX TX
More than safety.
Safety
More than safety.
Around the world – the Swabian
specialists in motion sequence
control for mechanical and sys-
tems engineering.
EUCHNER’s history began in 1940 with
the establishment of an engineering
office by Emil Euchner. Since that
time, EUCHNER has been involved in
the design and development of switch-
gear for controlling a wide variety of
motion sequences in mechanical and
systems engineering. In 1953, Emil
Euchner founded EUCHNER + Co., a
milestone in the company’s history. In
1952, he developed the first multiple
limit switch – to this day a symbol of
the enterprising spirit of this family-
owned company.
Automation – Safety – ManMachine
Today, our products range from
electromechanical and electronic
components to complex system solu-
tions. With this wide range of products
we can provide the necessary tech-
nologies to offer the right solution for
special requirements – regardless of
whether these relate to reliable and
precise positioning or to components
and systems for safety engineering in
the automation sector.
EUCHNER products are sold through a
world-wide sales network of compe-
tent partners. With our closeness to
the customer and the guarantee of
reliable solutions throughout the
globe, we enjoy the confidence of cus-
tomers all over the world.
Quality, reliability, precision
Quality, reliability and precision are the
hallmarks of our corporate philosophy.
They represent concepts and values
to which we feel totally committed.
At EUCHNER, quality means that all
our employees take personal respon-
sibility for the company as a whole
and, in particular, for their own field of
work. This individual commitment to
perfection results in products which
are ideally tailored to the customers’
needs and the requirements of the
market. After all: our customers and
their needs are the focus of all our
efforts. Through efficient and effective
use of resources, the promotion of
personal initiative and courage in find-
ing unusual solutions to the benefit of
our customers, we ensure a high level
of customer satisfaction. We familiar-
ize ourselves with their needs, require-
ments and products and we learn
from the experiences of our cus-
tomers’ own customers.
EUCHNER – More than safety.
Emil Euchner, the
company’s founder and
inventor of the multiple
limit switch, circa 1928.
Quality – made by EUCHNER
2
Contents
Safety Switches NX/TX
Product description
Advantages of the safety switches NX and TX
Changing the approach direction
Safety switches series NX... with metal housing, without guard locking
Design NX1...
Switching element with 4 switching elements
NX...M
Cable entry M20x1.5
Safety switches series TX... with metal housing, with guard locking
Design TX1... / TX2...
Switching element with 4 switching elements
with door monitoring contact
TX...M
Cable entry M20x1.5
TX...N
Cable entry NPT ½"
TX...BH10
Plug connector BH10
TX...RC18
Plug connector RC18
Design TX3...
Switching element with 4 switching elements
with door monitoring contact
Release under load possible
TX...M
Cable entry M20x1.5
TX...N
Cable entry NPT ½"
TX...BH12
Plug connector BH12
TX...RC18
Plug connector RC18
Design TX3..
Switching element with 4 switching elements
with door unlock request contact
Release under load possible
TX...M
Cable entry M20x1.5
Design TX3..
Switching element with 4 switching elements
with escape release from the rear of the switch
with door monitoring contact
Release under load possible
TX...M
Cable entry M20x1.5
Switching characteristics safety switches TX3...
Circuit diagrams and pin assignments
4
5
5
6
6
8
8
10
12
14
16
18
Accessories
Actuators
Emergency unlocking with manual return for safety switches TX
Emergency unlocking with automatic return for safety switches TX
Lock for safety switches TX
Cable glands
Safety screws
Plug connectors
Bolts for safety switches series TX
Mounting plates for safety switches TX
19
19
19
20
20
20
21
22
24
Appendix
Index
25
Techn. Release 01-11/04
3
Safety Switches NX/TX
Product description
On machines and systems that perform dangerous movements
and that could injure persons in the vicinity, the EU Machinery
directive requires the fitting of safety guards.
Safety switches have the task of monitoring the position of the
moving part of the safety guard. If guard locking is necessary
for reasons of process protection or the protection of personnel,
safety switches with electromechanical guard locking are used.
The safety switches NX and TX from EUCHNER are character-
ized by their robust, metal encapsulated housing. This feature
enables the switches to be used in many sectors and applicat-
ions. The advantages of these switches make them the optimal
choice for harsh environments.
The safety switches NX/TX have the following specific ad-
vantages:
High degree of protection IP 67
Housing material made of die-cast alloy
High quality dipped housing surface finish, resistant to
many fuels and oils
High locking force of 1500 N in locked state on the safety
switch TX
The safety function on the safety switch NX is only obtained
when the safety guard is opened or the actuator removed. As
the switch does not have a locking function, the actuator can be
removed from the switch at any time. This means that imme-
diately after the safety guard is opened, the safety contacts are
opened and a machine stop is initiated - independent of the
machine cycle currently being performed.
These switches are used, for instance, to protect dangerous
points that have, e.g. hinged or sliding doors, flaps and remov-
able covers.
The safety switch TX complies with the requirements in EN 1088
sec. 3.4 for an interlocking device with guard locking. On
machines and systems with dangerous overtravel, this switch
prevents premature operator access to the system.
To perform the cyclic unloading and loading processes on a
system as quickly as possible, operators have a tendency to
await the safety switch release process by pulling on the safety
guard. However, with almost all standard safety switches it is
not possible to release the door if the safety door is pulled hard
and the safety switch is placed under load.
The EUCHNER safety switch TX3 is designed for exactly this
task:
Even at very high tensile forces on the actuator, the safety switch
can be reliably released. On release the solenoid coil is briefly
over-excited by the integrated electronics. The increased mag-
netic force makes possible release under load.
The sequential switching characteristic of the safety switch TX
enables the actuator to be monitored (inserted/removed) and
the solenoid to be monitored (locked/released) using one switch-
ing element. This feature yields the benefit of a compact, slim
design.
The switch is excellently suited to attachment to safety guards
made of aluminum profiles.
The mounting plates developed for this purpose make it
possible to straightforwardly and rapidly mount the switch and
actuator to the safety guard using slot nuts.
The large opening funnels on the safety switches NX/TX enable
the actuator to be reliably inserted in the actuator head even
with a safety guard misalignment of ± 5 mm.
Even in the locked state the safety door can move a distance of
6 mm in the actuating direction.
Here the advantage of the safety switch is again clear: it
provides the user considerable freedom of movement on the
safety door.
The safety switch actuating head can be approached both
horizontally and vertically.
The adjustment of the actuating head in 90° steps aids the flex-
ible attachment of the safety switch NX/TX to the safety guard
frame. This flexibility results in numerous installation options.
It is also very easy to change the approach direction:
After the removal of the switch cover, the actuating head can be
placed in the required position with a light rotary movement (bayo-
net joint). With the switch cover closed, it is no longer possible
to move the actuating head.
If, for safety reasons, the actuating head is to be fastened to the
switch such that it cannot be rotated, the actuating head can be
fixed in position using the two locking pins included. Changing
the approach direction and the use of the locking pins is
described on page 5.
The safety switches NX/TX are available in the following ver-
sions:
Cable entry (with metric thread M20 or NPT ½") or plug
connector (19-pin Coninvers or 12-pin MIN-SERIES SIZE III,
US Standard)
Mechanical or electrical locking
Solenoid voltages AC/DC 24 V or AC 110/230 V
Various switching elements (contact assemblies)
Switching elements with door monitoring contact or door
unlock request contact.
As standard the safety switches TX have a mechanical release
that can be operated with the aid of simple tools (screwdriver).
As an option EUCHNER can provide a lock or a manually oper-
ated release (with and without detent mechanism) as the
mechanical release.
Furthermore, as standard this switch has 2 LEDs (red/green)
that the user can control as required. The convex displays are
fitted to the housing cover such that they are raised and the
state of the indicator can be clearly seen from the side even at
larger distances.
The solenoids in the safety switch TX are equipped with a bridge
rectifier ahead of the solenoid. In this way the guard locking can
be operated with both DC and AC. There is no need for external
interference suppression units.
4
Safety Switches NX/TX
EUCHNER provides switch variants with a door unlock request
contact with the following function:
When the actuator is locked and the safety door is pulled, a
signal is sent to the control system. Depending on the control
concept, the safety guard can be unlocked automatically – when
overtraveling machine components have stopped. Particularly
on extensive machines the operator is saved the need to walk to
the control panel.
The entire safety switch TX range is rounded off by actuators
made of stainless steel, a bolt especially designed for aluminum
profiles and related accessories.
The 4 switching contacts can handle switching currents from
1 mA to 4 A. The ability to switch low currents makes it possible
to connect the safety switches NX/TX directly to safe control
systems, as are becoming increasingly important as technology
progresses.
Advantages of the safety switch NX
Robust housing made of die-cast alloy with cathodically
dipped surface finish
High corrosion protection
Resistant to aggressive liquids
Slender design
Suitable for mounting on profiles
Large opening funnel for actuators
Large tolerances on the insertion of the actuator
Actuator insertion also on misalignment of the
safety guard (± 5 mm)
Large freedom of movement of the actuator (up 13 mm
actuator travel)
Straightforward and quick adjustment of the actuating
head to 4 approach directions, plus an approach direction
from above
Possible to lock the actuating head against twisting
3 cable entries with optional cable entry from the rear
Optional two LED function display on the safety switch
Local status indication at the safety guard
Actuating head can be replaced
Advantages of the safety switch TX
Robust housing made of die-cast alloy with cathodically
dipped surface finish
High corrosion protection
Resistant to aggressive liquids
Slender design
Suitable for mounting on profiles
Large opening funnel for actuators
Large tolerances on the insertion of the actuator
Actuator insertion also on misalignment of the
safety guard (± 5 mm)
Large freedom of movement of the actuator (up 13 mm
actuator travel) in the locked state
Straightforward and quick adjustment of the actuating
head to 4 approach directions, plus an approach direction
from above
Possible to lock the actuating head against twisting
Pulling the door does not prevent the switch from being
released
3 cable entries with optional cable entry from the rear
Different solenoid operating voltages
2 LED function displays on the safety switch
Local status indication at the safety guard
Mechanical release from the front (standard)
Lock for mechanical key release (optional)
Integrated bridge rectifier on all designs
One version for 24 V DC and AC
Different switching functions with
Door monitoring contact and
Door unlock request contact
Actuating head can be replaced
Changing the approach direction
(based on the example of the safety switch TX)
The locking pins supplied can be used to prevent twisting
and removal of the actuating head when the housing cover is
removed.
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
