Protection Relays
Intrinsically Safe Relays
ISS-105 SERIES
Five-Channel Intrinsically Safe Switch
Description
The ISS-105 is a “smart” five-channel intrinsically safe relay and
pump controller. The ISS-105 can be configured for pump-up or
pump-down applications or as a five-channel relay covering a
wide variety of applications.
The ISS-105 has a long list of features that are needed for
multiple pump applications and can indicate low, high and
out-of-sequence alarms. If an out-of-sequence alarm occurs,
the skipped pump(s) will be started as intended.
The Model ISS-105 can be set-up to do non-alternating
control, alternating control and alternating control with one
non-alternating pump. The non-alternating pump is intended for
use with an emergency or jockey pump. The ISS-105 can start an
emergency pump once every 50 cycles to keep it working freely.
Using the built-in DIP switches, individual pumps can be disabled
when taken out of service for repair or maintenance.
Features & Benefits
Wiring Diagram
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5 intrinsically-safe input channels meeting UL913 Sixth Edition
Typical Application:
TYPICAL APPLICATION:
Duplex Pump Down with High and Low Alarms.
Duplex Pump-Down with High and Low Alarms
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4 normally open output relays and 1 SPDT output relay
Audible Alarm
High
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Field selectable pump control options
Alarm
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Monitors float sequencing and sends signal to alarm if
Low
Alarm
out-of-sequence condition occurs
120 VAC
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High and/or low alarm options depending on the number of
Pump
1
Pump
2
pumps and settings
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Output contacts for audible alarm
High Alarm Float
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Meets IEC EMC standards for Electrical FastTransients (EFT),
Electrostatic Discharge (ESD) and Radio Frequency Immunity (RFI)
#1
#2
#3
#4
#5
INPUT
Lag 1 Float
Lead Float
120 VAC
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PUMP PUMP
#1 #2
LOW
HIGH
AUDIBLE
ALARM
MODE 1
DIN rail or surface mountable allows flexibility in
panel installation
ALARM ALARM
DUPLEXER
PUMP DOWN
IS Super Cell
MODEL ISS-105
LOW
HIGH
OFF
LEAD LAG1
COMMON
ALARM
ALARM
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User-selectable alternator/non-alternator option
INTRINSICALLY
Stop Float
SAFE INPUTS
#1
#2
#3
#4
#5
C
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Non-alternating pump option for emergency or
Low Alarm Float
jockey applications
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Pump disable switches make it easy to disable individual
pumps when they are out for service or repair
Many other configurations are possible.
See users manual for more details.
PUMP
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Adjustable lag pump delay for all pumping modes
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Adjustable delay-on-make/break timer in five-channel
relay mode
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Finger-safe terminals meet IEC 61000 safety requirements
Ordering Information
MODEL
LINE VOLTAGE
DESCRIPTION
ISS-105
120VAC
Intrinsically-Safe & Pump Controller
Intrinsically-Safe Only
ISS-105-ISO
ISS-105-ISO-3
ISS-105-ISO-4
ISS-105-ISO-F
120VAC
120VAC
3-Channel Intrinsically-Safe Only
4-Channel Intrinsically-Safe Only
ISO with Fast Trip Relays
120VAC
120VAC
© 2017 Littelfuse Protection Relays & Controls
www.littelfuse.com/iss105
Rev: 1-B-050517