Littelfuse

ISS-100

Name: Littelfuse ISS-100 UL 913 listed intrinsically safe switch for hazardous/non-hazardous area interfacing. Installed in safe zones.
Brand: Littelfuse
SKU: ISS-100
Availability: InStock

Alternate Item Number: ISS-100

UPC: 079458994247

Documents & Media

Brochure Specification Sheet User Manual

Contact for Pricing

Overview

The Littelfuse ISS-100 is a UL 913 listed intrinsically safe switch designed as an associated apparatus for reliable interfacing between hazardous and non-hazardous areas in industrial environments. Engineered to meet the most stringent safety standards, this robust unit ensures compliance with UL 913 Sixth Edition (File #E233355) while providing critical protection in volatile settings such as oil and gas facilities, chemical processing plants, and manufacturing operations where explosive atmospheres may be present. This intrinsically safe relay is specifically designed to be installed in non-hazardous areas, acting as a secure bridge between hazardous zones (Class I, II, III; Groups A-G) and control systems located in safe environments. The ISS-100 features finger-safe terminals that comply with IEC 61000 safety requirements, offering both operator protection and reliable electrical connections. Its compact design supports flexible installation options, including 35mm DIN rail mounting or surface mounting with #6 or #8 screws, making it ideal for space-constrained control panels. Key features of the ISS-100 include a continuous 5VDC probe sense voltage, an isolated output relay rated for 8A @120VAC general purpose or 180VA @120VAC pilot duty, and a mechanical relay life of 10,000,000 cycles with a minimum of 100,000 electrical cycles at rated load. The unit operates efficiently across a temperature range of -20°C to 55°C (-4°F to 131°F) with a maximum input power of 1.5W, ensuring reliable performance in demanding industrial conditions. The ISS-100's entity parameters (Voc=16.8V, Isc=1.2mA, La=100mH, Ca=0.39µF) guarantee intrinsic safety for connected circuits in hazardous locations, while compliance with IEC 61000-4-2 (ESD Level 3), IEC 61000-4-3 (RFI Level 3), and IEC 61000-4-4 (Fast Transients Level 3) ensures robust electromagnetic immunity. The integrated LED status indicator provides clear visual confirmation of relay engagement, simplifying troubleshooting and system monitoring. Professionals in oil and gas, petrochemical, pharmaceutical, and food processing industries rely on Littelfuse's ISS-100 for critical applications including pump control, liquid level monitoring, and process automation where hazardous area protection is mandatory. The switch's compliance with global safety standards and Littelfuse's reputation for quality and reliability make it a trusted choice for engineers specifying intrinsically safe components. With its combination of performance, safety certification, and installation flexibility, the ISS-100 delivers the peace of mind required for mission-critical industrial safety applications.

UL 913 Sixth Edition listed (File #E233355) for hazardous area safety
Installed in non-hazardous areas to interface with hazardous zones (Class I, II, III; Groups A-G)
8A @120VAC general purpose or 180VA @120VAC pilot duty output rating
Finger-safe terminals meet IEC 61000 safety requirements
Compact design supports DIN rail or surface mounting (35mm rail or #6/#8 screws)

Specifications

Brand Name	Littelfuse
Mounting	DIN rail or Surface mount (#6 or #8 screws)
Number Of Poles	DIN rail or Surface mount (#6 or #8 screws)
Operating Temperature	-4 to 158
Operating Temperature, Maximum	158
Operating Temperature, Minimum	-4
Series	ISS
Standard	UL
Sub Brand	Symcom
Package Dimensions (L x W x H)	2.35 IN x 2.08 IN x 3.5 IN
Package Dimensions (L x W x H)	59.7 mm x 52.9 mm x 88.9 mm

1-1393143-3

Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10

1-1393143-6

Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10

RK926011-BC

RTXP 18

6896057-1

RTXD Extractor Tool

PS-60

Power supply for DIN-rail

SCP102D24X-C02

IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

C3SC10106GY

N3 SCREW COVER - 10X10X6 - GRA

ACS380-040S-07A2-4

ACS380 AC Drive, 3-380-480V In, 3HP, 6A, Type OPEN, 1.5 overload, Integrated, HxWxD 6.69x2.76x7.52 in, Module

0626030563

BK63H 1P B2A 10kA 120/240VAC UL1077

1338006700

MC-50a AC120V 50/60Hz SCREW 1a1b (Metasol) EXP (MC50A-30-11-K7-S-E)

1270040900

GMD-16M DC240V 3W 1b EXP (GMD16M-30-01-UD-3W-S-E)

1SNK705010R0000

Combine high performance with compact dimensions: - 1000 V AC / DC IEC 600 V UL, - Opt for the best marking visibility thanks to the up-front, flat marker zone, which lets you mark up to eight digits or increase the font size.

CR104PXN1B

Pushbuttons. 104P heavy duty Oiltight Pushbutton. Nameplate. XN1B PR.No. CR100699

XT2NU3090BFF000XXX

C.BREAKER TMAX XT2N 125 UL/CSA FIXED THREE-POLE WITH FRONT TERMINALS AND THERMOMAGNETIC RELEASE TMA R 90 I3=450...900 A

TEYF2110MM

110A 2P 65K 240V TEYF TENANT BREAKER

NNC75X75WH2

The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.

3194213000K04

DS9 RECEPTACLE POLY BLUE SIZE 5 IP 66/67/69 3P+G 150 A 480 VAC 60 Hz

C2G0150MQMJ

HPS Open Style Control Transformer, 150VA 240x480V-120x240V 50/60Hz

ISS-101

The ISS-101 switches are UL 913 listed as an associated apparatus for interfacing between hazardous and non-hazardous areas. These units must be installed in a non-hazardous area.

ISS-102C-M-LC

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. Two 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 a debounce delay feature of 0.5 seconds. Resistance probes or switches can be used on its inputs. Two LEDs illuminate the output state of either form A relay. 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.

PC-102CICI-LT

PC-102CICI-LT is a seal-leak and over-temperature detector that uses one input to sense seal failures and the temperature input to detect motor overheating. This unit is configurable to suit various probes. Seal input logic (direct or inverted) and over-temperature trip reset (automatic or manual) is DIP-switch selectable. See datasheet for detailed technical characteristics.

ISS-102ACI-MC

ISS-105-ISO

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.

ALT-115-X-SW

The ALT alternating relays are used to alternate between two loads. The ALT is commonly used in duplex pumping applications to balance the runtime of both pumps. The ALT-S is used in single high-level float applications. When the float switch opens, the alternating relay changes state, forcing the other pump to run the next time the float closes. All ALT relays have a built-in debounce feature that prevents the relay from changing state if the switch or float contact bounces momentarily. The ALT-X has an internal cross-connected relay and is used in dual high-level float applications. These floats are commonly referred to as lead and lag floats. The pumps alternate as in the ALT-S version but the crossconnected relay configuration allows both pumps to run simultaneously when both the lead and lag floats are closed. These relays are also available with a built-in switch (SW option) that is used to manually force one of the pumps to run every time the float switch is closed. This is helpful when a pump has been removed for repair or for test purposes. In the case of the ALT-X-SW, the switch essentially forces one pump to be the lead pump, while still allowing the second to run when both floats are closed. Must use the OT08PC socket for UL Rating!

ALT-230-S

201-200-SP

The 201-xxx-SP is an 8-pin octal-base, plug-in voltage monitor designed to protect single-phase motors regardless of size. The 201-100-SP is used on 95-120VAC, 50/60Hz motors to prevent damage caused by low voltage. The 201-200-SP is used on 190-240VAC, 50/60Hz motors. The 201-200-SP-T-9 is a pin-for-pin replacement for a Time Mark; #260 Series voltage monitor. High voltage protection is included in the 201-200-SP-T-9. The unique microcontroller-based voltage and voltage-sensing circuit constantly monitors the voltage to detect harmful power line conditions. When a harmful condition is detected, the relay’s output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level and a specified amount of time has elapsed (restart delay). The trip delay prevents nuisance tripping due to rapidly fluctuating power line conditions.

PC-100-LLC-GM

PC-100-LLC-GM is a liquid level control relay with an input voltage ac of 95–120 and an adjustable probe sensitivity from 4.7–100 kΩ.

ISS-105

ALT-115-S-SW

77C-KW/HP

The 77C-KW/HP single-phase current and voltage monitor provides protection with voltage from 100–240 V ac and motor full load ampere range of 2–90 A (external CTs required above 90 A).

Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.

Littelfuse

ISS-100

Documents & Media

Overview

Specifications

Brand Name

Mounting

Number Of Poles

Operating Temperature

Operating Temperature, Maximum

Operating Temperature, Minimum

Series

Standard

Sub Brand

Package Dimensions (L x W x H)