Alarmtech MC 746-E User manual

MC 746-E Instruction Manual 4-MC746-E-01
© 2020 Alarmtech Rev. MC746-E_2048en Page 1of 2
Detectors
Magnetic Contact
Surface mounting
Instruction Manual MC 746-E
DESCRIPTION
MC 746-E is a surface mounted magnetic contact with a
change over reed contact (NC/NO) to be used in both alarm
and security access control systems for protection of doors
and windows against unauthorised opening. The magnetic
contact is designed to be mounted in places with limited
space.
MOUNTING INSTRUCTIONS
MC 746-PE option with the cable inlet at the bottom of
the housing is available.
Contact and magnet should be installed in parallel,
corresponding to each other. Offset will reduce the
working distances.
Contact can operate in front-to-front or side-to-side
configuration.
CIRCUIT DIAGRAM
TECHNICAL DATA
Working environment
Wood
Steel
Make distance
typ. 37 mm
not recommended
Break distance
typ. 44 mm
not recommended
Contact type
Form C (SPDT)
Switching voltage max.
48 V DC/AC
Switching current max.
250 mA DC/peak AC
Contact rating max.
10 W
Cable
ф 3,6 mm,5x0,182 mm2
Operating temperature range
-40°C to +70°C
Operating humidity
max. 95% RH
Housing material
plastic ABS
Dimensions:
Contact part
60 x 5 x 14 mm
Magnet part
60 x 5 x 14 mm
MC 746-E
MC 746-PE

MC 746-E Instruction Manual 4-MC746-E-01
© 2020 Alarmtech Rev. MC746-E_2048en Page 2of 2
OPERATING PRINCIPLE
MC 746-E magnetic contact has two parts: the contact part
with a reed switch and the magnet part. In its neutral position
the reed switch remains closed under the force of the
magnetic field. Opening the monitored object increases the
distance between the reed switch and the magnet. This
causes a change in position of the reed switch and as a result
–a path of the signal.
Magnetic contacts should not be installed in the vicinity of
strong magnetic fields.
INSTALLATION
Depending on the application, contact and magnet should be
installed in either front-to-front or side-to-side configuration.
MC 746-PE option increases the number of possible
applications. Installation drawings show the correct
positioning of the contact parts. Contact and magnet should
be installed in parallel, corresponding to each other. Offset
will reduce the working distances. The contact should be
mounted on the stationary part of the monitored object (ex.
door frame) and the magnet on the movable part (ex. door
leaf).
During installation of the contact part of MC 746-PE (cable
inlet at the bottom) in window or door frame, it is advised to
leave additional cable loop for about 10cm long.
After the installation, use an ohmmeter to check the electrical
connections and test the operation of the magnetic contact.
Warning: applying excessive force to the housing of the
contact may damage the glass body of the reed switches
inside.
Warning: installation in ferromagnetic environment is not
recommended.
INSTALLATION DRAWINGS
Correct positioning of side cable inlets ensure the maximum
working distances.
MC 746-E in front-to-front configuration
MC 746-E in side-to-side configuration
MC 746-PE in front-to-front configuration
MC 746-PE in side-to-side configuration
We reserve the right to changes without notice.