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
Contact arrangement
1 N.C. & 1 N.O. or 2 N.C.
Protection
P66
Rated voltage
250V AC and 250V DC
Rated current
5A AC and 0.25A DC
AC ratings
250V 125V
Resistive
6A 6A
Inductive
2.5A 3A
DC ratings
250V 125V 75V 30V
Resistive
0.25A 0.5A 1A 7A
Inductive
0.1A 0.2A 1A 5A
Contact block—technical specifications
Operating force
1.6N - 0.4/ - 0.2N
Release force
0.4N
Pre-travel
0.8mm
Over-travel
0.6mm
Return travel
1.1mm
Differential travel
0.5mm
Release travel
0.2mm
Positive break travel
0.4mm
Repeatability
+0.01mm
Minimum plunger operating
1 mm/min.
speed
Maximum switching rate
3000/h
Mechanical life
2 x 10
6
Electrical life
Ambient temperature
Electrical connection
Ferrogard GS2
Classification
Contact arrangement
Protection
Rated voltage
Rated current
Max VA
Dependent on loading
-25°C to +70°C (-10°F to 284°F)
Potted in leads. Flexible
4 x 0.75mm
2
, 2m long
EExd IIC T6 Baseefa
Not suitable for Group 1 gases
1N&C
IP68
250V AC
2A
100 at 50V
200 at 110V
500 at 250V
Make 15mm, break 26mm
3.0ms
2.1ms
0.7ms
<50G
7-15G at 10-2000Hz
0.07Ω (excluding cable)
100 x 10
6
5 x 10
6
-10°C to +40°C (14°F to 104°F)
Brass or stainless steel
3m of Termorad
NRTL/C
Description
Guardmaster 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.
EEx equipment conforms to types of protection standardised by
CENELEC (European standards), EN50014 and EN50018
respectively and BS5501 parts 1-V.
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.
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.
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
Safety contact operating distance
Close time
Drop out time
Bounce time
Shock tolerance
Vibration tolerance
Initial resistance
Mechanical life
Electrical life
Ambient temperature
Housing
Cable
Note:
For all other specifications and dimensions see relevant standard switch.
16-2
ALLEN-BRADLEY [ Allen-Bradley ]
