Intrinsically Safe Relays


The ISP series of Intrinsically Safe Relays provide a safe and reliable method to control a load (motor starter, relay, etc.) with an input device (switch, sensor, etc.) located in a hazardous area. The Instrument Society of America defines intrinsically safe equipment & wiring in their specification ISA-RP12.2 as: "equipment and wiring which is incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmospheric mixture in its most ignited concentration. Intrinsically safe terminations and wiring may be brought into any hazardous location of any Group classification for which it is accepted without requiring explosion-proof housing or other means of protection".

  • Provides Low Cost Alternative to Explosion-Proof Enclosures
  • Single Channel
  • Isolated 10A SPNO output contact
  • 120V AC Input Voltage
  • LED Status Indicator
Enclosure Style Plug-in case with 8 pin socket & mounting bracket included
Contact Rating
  • SPNO
  • 10A Resistive @ 120V AC
Approvals Intrinsically Safe RelayUL File #E318075
Technical Documentation


UL Listed apparatus provides intrinsically safe circuits for use in Class I Groups A, B, C, D, Class II Groups E, F, G, and Class III Hazardous Locations. The ISP relay must be mounted in a non-hazardous area, following Macromatic Control Drawing Number ISR2A01D. In order to comply with UL requirements, intrinsically safe and non-intrinsically safe wiring must be physically separated to prevent inadvertent bypass.

Each ISP relay consists of an intrinsically safe control switch input and an electromechanical relay output. With input voltage applied, the LED will be OFF.  When the input from the hazardous area is closed, the output relay is energized and the LED is ON (Green).  When the input switch opens, the output relay will de-energize and the LED will be OFF.

Typical applications include pump lift stations, grain elevators, refineries and paint rooms.

intrinsically safe relay

Sign Up For Macromatic's Newsletter

©2018 Macromatic Industrial Controls, Inc.

W134N5345 Campbell Drive
Menomonee Falls, WI 53051

800-238-7474 • 262-781-3366

Rep Login | Newsletter Sign Up | Articles | Employment | Privacy Policy | Sitemap
Knowledgebase General | Alternating Relays | Current Sensing Relays | Liquid Level Control Relays | Seal Leak Relays | Three-Phase Monitor Relays | Time Delay Relays | Voltage Monitor Relays