Hazardous Location & Pneumatic Switches
Explosion Proof
Ex Range
Specifications
All switches excluding Ferrogard GS2
Contact block—electrical specifications
Classification
EExd IIc T6 Class 1, Div 2,
Groups A, B, C and D
1 N.C. & 1 N.O. or 2 N.C.
P66
250V AC and 250V DC
5A AC and 0.25A DC
250V 125V
Contact arrangement
Protection
Rated voltage
Rated current
AC ratings
Resistive
6A 6A
Inductive
2.5A 3A
DC ratings
Resistive
Inductive
250V 125V 75V 30V
0.25A 0.5A 1A 7A
0.1A 0.2A 1A 5A
NRTL/C
Description
Contact block—technical specifications
Operating force
Release force
1.6N - 0.4/ - 0.2N
0.4N
Guardm aster Ex Range
The Guardmaster Ex range of safety switches are specifically
designed for potentially explosive atmospheres. They retain the safety
features and operating principles of the conventional Guardmaster
switches. They incorporate a sealed flameproof contact block, making
them suitable for use in European Zone 1 and Zone 2 environments. In
the US and Canada, these products can be used in areas classified as
Class 1, Division 2 in Groups A (acetylene), B (hydrogen), C (ethylene)
and D (propane). All the Guardmaster Ex switches conform to the
exacting standards required by the European harmonized standards.
These switches carry the classification EExd IIC T6 Baseefa.
Pre-travel
Over-travel
Return travel
Differential travel
Release travel
Positive break travel
Repeatability
Minimum plunger operating
speed
0.8mm
0.6mm
1.1mm
0.5mm
0.2mm
0.4mm
+0.01mm
1 mm/min.
Maximum switching rate
Mechanical life
3000/h
EEx equipment conforms to types of protection standardised by
CENELEC (European standards), EN50014 and EN50018
respectively and BS5501 parts 1-V.
6
2 x 10
Electrical life
Ambient temperature
Electrical connection
Dependent on loading
-25°C to +70°C (-10°F to 284°F)
Potted in leads. Flexible
The d suffix indicates that the contact block in the switch is a
flameproof enclosure and is designed to ensure that if an internal
explosion occurs it will be contained with the enclosure. The
designation II indicates use in surface industries and c refers to the
group of gases for which the switches are suitable. The designation T
represents the surface temperature classification of the switch. These
switches have been tested with an ambient temperature of 60°C as
opposed to the normal test limit of only 40°C, allowing them to be
used in gases having a low flash point.
2
4 x 0.75mm , 2m long
Ferrogard GS2
Classification
EExd IIC T6 Baseefa
Not suitable for Group 1 gases
1 N & C
IP68
250V AC
2A
100 at 50V
200 at 110V
500 at 250V
Contact arrangement
Protection
Rated voltage
Rated current
Max VA
It should be noted that these groups refer to the explosion-proof
qualities of the switches and not corrosion-resistance characteristics.
Special precautions may be required to protect the vulnerable parts
such as PVC-covered cables against attack by certain corrosive
elements and physical damage.
Safety contact operating distance Make 15mm, break 26mm
Close time
3.0ms
Drop out time
Bounce time
Shock tolerance
Vibration tolerance
Initial resistance
Mechanical life
2.1ms
0.7ms
<50G
7-15G at 10-2000Hz
Features
•
•
•
•
For use in potentially explosive atmospheres
Positive mode action, flameproof contact block
Suitable for use in European Zone 1 and 2 environments
US and Canada: Class 1, Division 2 in Groups A, B, C and D
0.07Ω (excluding cable)
6
100 x 10
6
Electrical life
5 x 10
Ambient temperature
Housing
Cable
-10°C to +40°C (14°F to 104°F)
Brass or stainless steel
3m of Termorad
Note: For all other specifications and dimensions see relevant standard switch.
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