FLAMEPROOF LIMIT SWITCHES

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2018 r.1
INDEX

Rotary type

Main features Pag. 3

Certifications Pag. 4

Technical specifications Pag. 5

Overall dimensions Pag. 6

Position type

Main features Pag. 7

Certifications Pag. 8

2 contacts version Pag. 9

4 contacts version Pag. 10

Overall dimensions Pag. 11

Technical specifications Pag. 11

LIMITEX ROTARY LIMITEX POSITION FULL BODY

TYPE TYPE STAINELESS STEEL
 LIMITEX Rotary limit switch

Flameproof rotary limit switch.

Rugged and reliable, Limitex is used to control
the movement of industrial machinery in potentially
explosive areas.

• Accurate adjustment of cams by means of

MAIN FEATURES

screws.
• Positive opening NC contacts for safety fun-
ctions.
• Mechanical life of switches: 1 million operations.
• Protection degree: IP66.
• Ambient temperature range: -40°C to +60°C.
• External enclosure made of G20 cast iron, stainless steel transmission and gear driving shafts,
selflubricating technopolymer gears and driving bushes.
• All materials and components used are wear resistant
• Full Body Stainless Steel Version Available

GENERAL SAFETY SPECIFICATIONS

Maximum power supply 300 Vac
Maximum current intensity 3A
Maximum dissipated power 2 Watt
Rated frequency 50 / 60 Hz

GENERAL TECHNICAL SPECIFICATIONS

Maximum rotation speed 800 rev./min.
Cable entry Nr. 1 M20x1,5 - Nr. 1 M25x1,5 - Nr. 1 ½ NPT
(cable glands not supplied)

• Revolution ratios from 1:15 to 1:1578, achieved by combining different secondary output sta
OPTIONS

ges.
• Snap action switches with 1NO+1NC change-over contacts.
• It can be equipped with a cam set with 2-3-4 switches.
• Available with flange for direct coupling to the transmission unit.

3
 Conformity to Atex Standards
CERTIFICATIONS

EN 60079-0 Explosive atmospheres - Equipment - General requirements

EN 60079-1 Explosive atmospheres - Equipment protection by flameproof enclosures ‘d’
EN 60079-31 Explosive atmospheres - Equipment dust ignition protection by enclosure “t”

Conformity to IECEx Standards

IEC 60079-0 Explosive atmospheres - Equipment - General requirements

IEC 60079-1 Explosive atmospheres - Equipment protection by flameproof enclosures ‘d’
IEC 60079-31 Explosive atmospheres - Equipment dust ignition protection by enclosure “t”

Certificate

INERIS 13ATEX0020X - IECEx INE 13.0051X

Certification for group I, IIA, IIB and IIC with the marks*

MINING: I M2 Ex d I Mb (ATEX) Ex d I Mb (IECEx)

GAS Zone 1 and 2: II2G Ex d IIB T6 Gb or Ex d IIC T6 Gb (ATEX) Ex d IIB T6 or Ex d IIC T6 Gb (IECEx)
DUST Zone 21 and 22: II2D Ex tb IIIC T85°C Db IP66 (ATEX) Ex tb IIC T85°C Db IP66 (IECEx)
GAS & DUST: II2GD Ex d IIB or IIC T6 Gb Ex tb IIC T85°C Db IP66

Conformity to Community Directives

2006/95/CE Low Voltage Directive - 2006/42/CE Machinery Directive

Conformity to CE Standards

EN 60204-1 Safety of machinery - Electrical equipment of machines

EN 60204-32 Safety of machinery - Electrical equipment of machines - Requirements for hoisting machines
EN 60947-1 Low-voltage switchgear and controlgear
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

* The user is responsible for choosing the proper limit switch protection type, group and maximum case temperature. The user is also responsible for the
correct installation, connection to the electrical network and use and maintenance of the electrical devices.
4
TECHNICAL SPECIFICATIONS OF THE MICROSWITCHES

Utilisation category AC 15

Rated operational voltage 250 Vac

Rated operational current 3A

Rated thermal current 10 A

Rated insulation voltage 300 Vac

Mechanical life 1x106 operations

Connections 6.3 mm Faston taps

Wires 2x0.5 mm2, 2x1.5 mm2, 1x2,5 mm2

Tightening torque 0.5 Nm

Microswitch type Single break, snap actions

1 NO+1NC change-over contacts

Contacts
(All NC contacts are of the positive opening operation type )

12 14

Scheme
11

Weight with feet ( Kg ) 4,6

Weight with flange and feet ( Kg ) 5,2

STANDARD CAM SETS

Ref. Drawing No. and type of cams No. and type of switches Code

2 cams A 2 PRSL0003XX switches PRFC0008PEC

COMPONENTS

16
2 cams C 2 PRSL0003XX switches PRFC0009PEC

3 cams A 3 PRSL0003XX switches PRFC0004PEC

17
3 cams C 3 PRSL0003XX switches PRFC0006PEC

4 cams A 4 PRSL0003XX switches PRFC0202PEC

18
4 cams C 4 PRSL0003XX switches PRFC0198PEC

CAM REFERENCE CHART

Cam Switching angle Code

A 1 point 20.5° ±0.5° PRSL7140PI

B 10 points 14.0° ±0.5° PRSL7142PI

C 60° sector 78.0° ±0.5° PRSL7141PI

E 180° sector 199.5° ±0.5° PRSL7144PI

H 335° sector 344.0° ±0.5° PRSL7143PI

5
 OVERALL DIMENSIONS (mm)

8
6
FLANGE AND FEET MOUNTING FEET MOUNTING

N° 1 X M20
 LIMITEX
Cross position limit switch

Flameproof position limit switch.

Rugged and reliable, Limitex is designed to control the
movement of overhead travelling cranes, hoists and
complex machine tools operating in potentially explosive
areas.

• Positive opening NC contacts for safety functions.

MAIN FEATURES

• Mechanical life of switches: 1 million operations.

• Operation frequency: 3600 operations/hour max.
• Protection degree: IP66.
• Ambient temperature range: -40°C to +60°C.
• It features rugged external enclosure made of G20 cast iron and cross rod support made of
zinc alloy. Internal components are made of materials which guarantee long mechanical life
and continuous performance
• Full Body Stainless Steel Version Available

GENERAL SAFETY SPECIFICATIONS

Maximum power supply 250 Vac

Maximum current intensity 3A
Maximum dissipated power 2 Watt
Rated frequency 50 / 60 Hz

GENERAL TECHNICAL SPECIFICATIONS

Operation frequency 3600 operations/hour max
Cable
entry Nr. 1 M20x1,5 - Nr. 1 M25x1,5 - Nr. 1 ½ NPT
(cable glands not supplied)

• 2 or 4 snap action switches with 1NO+1NC change-over contacts.

OPTIONS

• Cross rods move to 3 or 4 maintained positions, with movement every 90°.

• Modular adapter with fixing points.

7
 Conformity to Atex Standards
CERTIFICATIONS

EN 60079-0 - Explosive atmospheres - Equipment - General requirements

EN 60079-1 - Explosive atmospheres - Equipment protection by flameproof enclosures ‘d’
EN 60079-31 - Explosive atmospheres - Equipment dust ignition protection by enclosure “t”

Conformity to IECEx Standards

IEC 60079-0 - Explosive atmospheres - Equipment - General requirements

IEC 60079-1 - Explosive atmospheres - Equipment protection by flameproof enclosures ‘d’
IEC 60079-31 - Explosive atmospheres - Equipment dust ignition protection by enclosure “t”

Certificate

INERIS 13ATEX0020X - IECEx INE 13.0051X

Certification for group I, IIA, IIB and IIC with the marks*

MINING: I M2 Ex d I Mb (ATEX) Ex d I Mb (IECEx)

GAS Zone 1 and 2: II2G Ex d IIB T6 Gb or Ex d IIC T6 Gb (ATEX) Ex d IIB T6 or Ex d IIC T6 Gb (IECEx)
DUST Zone 21 and 22: II2D Ex tb IIIC T85°C Db IP66 (ATEX) Ex tb IIC T85°C Db IP66 (IECEx)
GAS & DUST: II2GD Ex d IIB or IIC T6 Gb Ex tb IIC T85°C Db IP66

Conformity to Community Directives

2006/95/CE Low Voltage Directive - 2006/42/CE Machinery Directive

Conformity to CE Standards

EN 60204-1 Safety of machinery - Electrical equipment of machines

EN 60204-32 Safety of machinery - Electrical equipment of machines - Requirements for hoisting machines
EN 60947-1 Low-voltage switchgear and controlgear
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

6
8
LIMITEX WITH 2 CONTACTS

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

Microswitch type Double break, snap actions

1 NO+1NC
Contacts
(All NC contacts are of the positive opening operation type )

13 21

Scheme

14 22

Weight ( Kg ) 4,5

MAXIMUM ACTUATING DIMENSION

T-type rod - Cross rod with 3 maintained positions 30°

• Pre-travel angle for rotation contact operation: 70°-49°
• Maximum rotation angle for each maintained position: 90°
• Average angle for the mechanical tripping: 48°

Rod - Rod and Roller

Actuating point 93 mm

Actuating point 76 mm

Actuating point 60 mm

• Pre-travel angle for rotation contact operation: 24°

• Maximum rotation angle: 65°
150 mm rod

100 mm rod
125 mm rod

Rod - Rod and Roller

• Pre-travel angle for rotation contact operation: 49° 200 mm

• Maximum rotation angle for each maintained position: 90° 250 mm

• Average angle for the mechanical tripping: 48° 300 mm

• Maintained positions each: 90° Rod length

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 showed in the drawing.
9
 LIMITEX WITH 4 CONTACTS

Rated operational current 16 A at 250 Vac

Rated operational voltage 500 Vac

Rated thermal current 10 A

Rated insulation voltage 300 Vac

Mechanical life 10x106 operations

Connections Screw-type terminals

1x2.5 mm2, 2x1.5 mm2

Wires

Microswitch type Snap actions

Contacts 4 Microswitches 1NO+1NC

Scheme

OPERATION ANGLES

0 0 - Reset position
A - Microswitch working angle: 65°
1 - Maximum left handed operation: 90°
A A 2 - Maximum right handed operation: 90°

The end of round of the “cross bar” limit switches

1 2 have no limit stop (i.e. they can rotate around 360°).

10
OVERALL DIMENSIONS (mm)

13 21

.
Limit switches are equipped with 1NO+1NC snap action switches 14 22
CROSS POSITION LIMIT SWITCHES

Actuating travel Positions Rod Contacts

4 maintained Cross 2

13 21

.
Limit switches are equipped with 4 Microswitches 1NO+1NC snap action switches 14 22

Actuating travel Rod lenght Contacts

200 mm 4

200 mm 4

11
 Coel Industrial Solutions

COEL offers a wide range of exclusive products focused on dedicated industrial sectors.
Explore COEL INDUSTRIAL SOLUTIONS on
www.coel-is.com

Brake motors

Flameproof brakes

Flameproof limit switches

Flameproof pendant control stations

Hoist drives

a product of Coel Motori

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Milano - Italy
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