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Protection Relays
Intrinsically Safe Relays
www.littelfuse.com/iss102
Rev: 1-A-062116
Two-Channel Intrinsically Safe Switch
ISS-102 SERIES
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.
-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.
Features & Benefits
FEATURES BENEFITS
Finger-safe terminals Meets IEC 61000 safety requirements
Compact design for DIN
rail or surface mount
Allows flexiblility in panel installation
LED status indicator Visual indication of relay engagement
Two input channels
Flexibility for pump up/pump down latching
controller or two-channel switch applications
Wiring Diagrams
Ordering Information
MODEL LINE VOLTAGE DESCRIPTION
ISS-102A-LC 120VAC Latching Controller
ISS-102AA-DCS 120VAC Dual Channel Switch
ISS-102ACI-MC 120VAC Multi-function Controller
ISS-102C-M-LC 120VAC MSHA* evaluated
ISS-102CCI-M-MC 120VAC MSHA* evaluated
* Mine Safety and Health Administration
ISS-102A
See
Notes
1 & 2
LOAD
CH1 CH2Com
1 2 3
4 5 7 6
ISS-102AA
See
Notes
1 & 2
FORM A
FORM A
CH1 CH2Com
LOAD
1
LOAD
2
1 9 2 3
4 5 7 6
For more wiring diagrams and notes, see next page.
