Protection Relays
Intrinsically Safe Relays
ISS-102 SERIES
Two-Channel Intrinsically Safe Switch
Description
The ISS-102 is a two-channel, intrinsically-safe switch designed
for multiple uses including a pump-up/pump-down (latching)
controller or two-channel switch. LEDs indicate the state of the
intrinsically-safe inputs and output relays and user-selectable
options are available including a variable resistance threshold for
float inputs. The ISS-102 enclosure is surface or DIN rail mountable.
-LC
Each input channel is active when the corresponding
switch is closed. When the lag input (CH2) is activated, the
output closes. Applying latching logic, the output contact
remains closed until the lead (CH1) and the lag (CH2) inputs are
deactivated. Sensitivity is fixed at 100kOhms with a debounce
time delay of 2 seconds.
-DCS
This dual-channel switch has two Form A output relays.
Two LEDs illuminate the output state of their respective Form A
relay. Resistance probes or switches can be used on its inputs.
Sensitivity is fixed at 100kOhms with a debounce time delay of
0.5 seconds.
120VAC
LOAD
1
LOAD
2
Wiring Diagrams
120VAC
LOAD
1
2
3
1
9
2
FORM A
3
-MC
By selecting the proper functionality through the DIP
switches, you can define a pump-up or pump-down, single or
dual channel non-latching switch. The sensitivity adjustment
(4.7k-100kOhms) allows you to define the input impedance at
which the output relays (one Form A & one Form C) will change
state, with a debounce time delay of 0.5 or 2 seconds.
FORM A
Features & Benefits
FEATURES
Finger-safe terminals
Compact design for DIN
rail or surface mount
ISS-102A
ISS-102AA
BENEFITS
Meets IEC 61000 safety requirements
Allows flexiblility in panel installation
Visual indication of relay engagement
Flexibility for pump up/pump down latching
controller or two-channel switch applications
CH1
Com
CH2
CH1
Com
CH2
4
5
7
6
LED status indicator
Two input channels
4
5
7
6
See
Notes
1&2
See
Notes
1&2
Ordering Information
MODEL
LINE VOLTAGE
DESCRIPTION
ISS-102A-LC
ISS-102AA-DCS
ISS-102ACI-MC
See Note 3
120VAC
120VAC
120VAC
120VAC
120VAC
Latching Controller
Dual Channel Switch
Multi-function Controller
MSHA* evaluated
MSHA* evaluated
See Note 3
ISS-102C-M-LC
ISS-102CCI-M-MC
* Mine Safety and Health Administration
For more wiring diagrams and notes, see next page.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/iss102
Rev: 1-A-062116
Protection Relays
Intrinsically Safe Relays
ISS-102 SERIES
Wiring Diagrams (continued)
120VAC
MAX
LOAD
1
120VAC
LOAD
2
LOAD
1
120VAC
LOAD
2
120VAC
120VAC MAX.
LOA D
1
1
LOAD
3
LOAD
2
2
3
1
8
2
3
LOAD
3
LOAD
4
1
8
2
3
FORM A
10 11 12
FORM C
FOR M C
10
11
12
ISS-102C-M
FORM C
ISS-102ACI
Com
CH2
4
5
7
6
4
FOR M C
ISS-102CCI-M
5
7
6
NOTES:
1. Maximum distance between unit and switch
contact is 10,000 feet.
2. All non-intrinsically-safe wiring shall be separated
from intrinsically-safe wiring. Description of
special wiring methods can be found in the
National Electrical Code ANSI/NFPA 70, Article
504 Intrinsically-Safe Systems. Check your state
and local codes for additional requirements.
3. All switch contacts shall be non-energy storing,
containing no inductance or capacitance.
CH1
4
5
7
6
See
Notes
1&2
See
Notes
1&2
See
Notes
1& 2
See Note 3
See Note 3
See Note 3
Specifications
Functional Characteristics
Debounce Time
Probe Sense Voltage
Output Characteristics
Output Contact Rating
Pilot Duty
General Purpose
Relay Contact Life (Electrical)
Relay Contact Life (Mechanical)
Output Relay Type
ISS-102A-LC
ISS-102AA-DCS
ISS-102ACI-MC
ISS-102C-M-LC
ISS-102CCI-M-MC
General Characteristics
Temperature Range
Maximum Input Power
Wire Range
Terminal Torque
0.5 or 2 seconds
5vdc pulsed
Provides Intrinsically-Safe
Circuits in the
following locations:
Division 1 and 2
Class I, Groups A,B,C,D;
Class II, Groups E,F,G;
Class III
V
oc
= 16.8V
Po=Voc*Isc
I
sc
= 1.2mA
4
L
a
= 100mH
C
a
= 0.39uF
IEC 61000-4-2, Level 3, 6kV contact, 8kV air.
IEC 61000-4-3, Level 3, 10V/m
IEC 61000-4-4, Level 3, 4kV input power
UL913 Sixth Edition (File #E233355)
(except Models ISS-102C-M-LC &
ISS-102CCI-M-MC which have been
evaluated by MSHA)
H
88.9 mm (3.5”);
W
52.93 mm (2.08”);
D
59.69 mm (2.35”)
0.7 lb. (11.2 oz., 317.51 g)
35mm DIN rail or Surface Mount
(#6 or #8 screws)
Rev: 1-A-062116
180VA @120VAC, C150
5A @120VAC
100,000 cycles min. @ rated load
10,000,000 cycles
One Form A
Two Form A
One Form A & One isolated Form C
One Form C
Two Form C (one isolated)
-20° to 55°C (-4° to 131°F)
2W
12 to 20 AWG
3.5 to 4.5 in.-lbs. (max. 4.5 in.-lbs.)
Entity Parameters
Standards Passed
Electrostatic Discharge (ESD)
Radio Frequency Immunity (RFI)
Fast Transients
Safety Mark
UL
Dimensions
Weight
Mounting Method
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/iss102
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