Littelfuse ISS-105-ISO-F Intrinsically Safe Relay Product Description

The ISS-105 is a “smart” five-channel intrinsically safe relay and pump controller. The ISS-105 can be configured for a wide variety of applications including alternating or non-alternating duplex, duplex separate pump stop (SPS), triplex and quadplex applications. It can be set up for pump-up or pump-down applications or can be used as a five-channel relay.

The ISS-105 has a long list of features that are needed for multiple pump applications. The ISS-105 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.

Littelfuse ISS-105-ISO-F Intrinsically Safe Relay Typical Applications

• Isolated Output Relay

Littelfuse ISS-105-ISO-F Intrinsically Safe Relay Features

• Five Intrinsically Safe Input Channels Meeting UL 913 Sixth Edition
• Four Normally Open Output Relays & One 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
• 5-Year Warranty
• Made in the USA

Littelfuse ISS-105-ISO-F Intrinsically Safe Relay Specifications

Line Voltage . . . . . . . . . . . . 120 VAC

Frequency . . . . . . . . . . . . 50*/60Hz

Probe Sense Voltage . . . . . . . . . 5vdc continuous

Output Contact Rating

• Pilot Duty. . . . . . . . . . . . . . . . . . . . . .480VA @ 240VAC, B300
• General Purpose. . . . . . . . . . . . . . . . . . . . . . 7A @ 240VAC
• Relay Contact Life (Electrical) . . . . . . 100,000 cycles min. @ rated load
• Relay Contact Life (Mechanical) . . . . . 10,000,000 cycles

Temperature Range . . . . . . . . . . . . . . . . . . . . . -20° to 55°C (-4° to 131°F)

Maximum Input Power . . . . . . . . . . . . . . . . . . . . . 5 W

Wire Range . . . . . . . . . . . . 12 to 20 AWG

Recommended Terminal Torque . . . . . . . . . . . . 3.5 to 4.5 in.-lbs. (max. 4.5 in.-lbs.)

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

Electrostatic Discharge (ESD) . . . . . . . . . . . . .IEC 61000-4-2, Level 3, 6kV contact, 8kV air

Radio Frequency Immunity (RFI) . . . . . . . . . . IEC 61000-4-3, Level 3, 10V/m

Fast Transients . . . . . . . . . . IEC 61000-4-4, Level 3, 4kV input power

Safety Mark

• UL . . . . . . . . . . . . . . . . . . . . . UL913 Sixth Edition (File #E233355)

Weight . . . . . . . . . . . . . . . . . . . . . . . . 19.2 oz.

Mounting Method . . . . . . . . . . . 35mm DIN rail or Surface Mount (#6 or #8 screws)

*Note: 50Hz will increase all delay timers by 20%.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Littelfuse ISS-105-ISO Intrinsically Safe Relay Resources

Littelfuse ISS-105 Product Specifications

Littelfuse ISS-105 ISO Installation Bulletin

Littelfuse ISS-105 ISO Engineering Bulletin