7551-7552
7551-7552
Position limit switch
Cross position limit switch designed to control the
movement of overhead travelling cranes, hoists and
complex machine tools.
The choice of materials and technical solutions adopted
enable use in harsh operating conditions.
FEATURES OPTIONS
The data and the products illustrated in this brochure may be modified without notice. Under no
• Designed to guarantee excellent performance in the most • 4 snap action switches with 1NO+1NC contacts or slow
challenging operating conditions. action switches with 1NC contact.
• Rods with 4 maintained positions every 90°. • 3 outputs for cable glands to reduce installation time and
• 4 fixing holes. make wiring easier.
• Positive opening NC contacts for safety functions.
• Mechanical life of switches: 1 million operations.
• Operation frequency: 3600 operations/hour max.
CERTIFICATIONS
circumstances can their description have a contractual value.
• IP protection degree: 7551-7552 is classified IP66 with
• CE and UKCA markings.
specific cable gland M20.
• Extreme temperature resistance: -40°C to +70°C.
• It features die-cast aluminum alloy enclosure, with bushings
made of sinterized material and head made of zama to resist
any violent impact, chemical aggression and rust and to
reduce the need for routine maintenance operations on the
head.
• All materials and components used are wear resistant and
guarantee protection of the unit against water and dust.
1
7551-7552
CERTIFICATIONS
2014/35/UE Low Voltage Directive
Conformity to Community Directives
2006/42/CE Machinery Directive
Supply of Machinery (Safety) Regulations 2008
Conformity to UKCA Directives
Electrical Equipment (Safety) Regulations 2016
EN 60204-1 Safety of machinery - Electrical equipment of machines
EN 60947-1 Low-voltage switchgear and controlgear
Conformity to CE Standards EN 60947-5-1 Low-voltage switchgear and controlgear - Control circuit devices and switching
elements - Electromechanical control circuit devices
EN 60529 Degrees of protection provided by enclosures
Markings and homologations C
GENERAL TECHNICAL SPECIFICATIONS
Storage -40°C/+70°C
Ambient temperature
Operational -40°C/+70°C
IP protection degree IP66 max. with specific cable gland M20 (not supplied)
Insulation category Class I
Operation frequency 3600 operations/hour max
Cable entry M20
TECHNICAL SPECIFICATIONS OF THE SWITCHES
Code PRSL0036XX PRSL0037XX
Utilisation category AC 15
Rated operational current 3A
Rated operational voltage 250 Vac
Rated thermal current 10 A
Rated insulation voltage 300 Vac
Mechanical life 1x106 operations
Connections Screw-type terminals
1x2.5 mm2, 2x1.5 mm2
Wires (UL - (c)UL: use 60°C or 75°C copper (CU) conductor and wire 16-18 AWG)
Tightening torque 0.8 Nm
Switch type Double break, snap action Double break, slow action
1NO+1NC 1NC
Contacts (All NC contacts are of the positive opening (All NC contacts are of the positive opening
operation type ) operation type )
13 21 11
Scheme
14 22 12
Markings and homologations C X
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7551-7552
MAXIMUM ACTUATING DIMENSIONS
Rods with 4 maintained positions
• Pre-travel angle for rotation contact operation: 49°
• Maximum rotation angle for each maintained position: 90°
• Average angle for the mechanical tripping: 48°
• Maintained positions every: 90°
In order to ensure proper operations, the dimensions shall not be increased; anyhow, they can be decreased, taking into account
that the closer the impact point is to the center of the head, the higher the impact and the mechanical wear of rod and shaft are.
IMPORTANT: the maximum impact speed is 1.35 m/s, refering to the ideal impact points shown in the drawing.
30°
Actuating point 93 mm
Actuating point 70 mm
Actuating point 60 mm
150 mm rod
100 mm rod
125 mm rod
200 mm
250 mm
300 mm
Rod length
OVERALL DIMENSIONS (mm)
200
6
6
82
100
90°
45
5.5
200
9
125
143
126
94
9
4.5
69
75
90 95
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7551-7552
LIMIT SWITCHES
No. and type of switches Actuating travel Rod length Code
4 switches
180° 0° 90° 180°
PRSL0036XX
13 21 180° 0° 135° 180°
200 mm PF26755100
180° 90° 0° 180°
14 22
180° 135° 0° 180°
4 switches
PRSL0036XX 90° 45° 0° 90°
13 21 90° 45° 0° 90°
200 mm PF26755200
90° 0° 45° 90°
14 22
90° 0° 45° 90°
4 switches
180° 0° 90° 180°
PRSL0037XX
11 180° 0° 135° 180°
200 mm PF26755124
180° 90° 0° 180°
12
180° 135° 0° 180°
4
7551-7552
ASSEMBLY DRAWING
A3
A3
A2
A2
A1
Refer to the following tables for descriptions of: “Switches” and “Accessories”.
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7551-7552
COMPONENTS
Switches
Ref. Drawing Description Scheme Code
13 21
1NO+1NC snap action switch PRSL0036XX
14 22
A1 11
1NC slow action switch PRSL0037XX
12
Accessories
Ref. Drawing Description Code
Head for PF26755100 PF267551TE
A2
Head for PF26755200 PF267552TE
Rod 6x6x200 mm PRTO3006PE
A3
Rod 6x6x300 mm PRTO3012PE
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