Littelfuse ISS-105-ISO-4, ISS-105 Series, Five-Channel Intrinsically Safe Switch, 120VAC, 4-Channel Intrinsically-Safe Only

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

. 5 intrinsically-safe input channels meeting UL913 Sixth Edition
. 4 normally open output relays and 1 SPDT output relay
. Field selectable pump control options
. Monitors float sequencing and sends signal to alarm if out-of-sequence condition occurs
. High and/or low alarm options depending on the number of pumps and settings
. Output contacts for audible alarm
. Meets IEC EMC standards for Electrical Fast Transients (EFT), Electrostatic Discharge (ESD) and Radio Frequency Immunity (RFI)
. DIN rail or surface mountable allows flexibility in panel installation
. User-selectable alternator/non-alternator option
. Non-alternating pump option for emergency or jockey applications
. Pump disable switches make it easy to disable individual pumps when they are out for service or repair
. Adjustable lag pump delay for all pumping modes
. Adjustable delay-on-make/break timer in five-channel relay mode
. Finger-safe terminals meet IEC 61000 safety requirements